Swift LeetCode 目錄 | Catalog（每週日更新......）

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說明：題目中含有$符號則爲付費題目。

如：[Swift]LeetCode156.二叉樹的上下顛倒 $ Binary Tree Upside Down

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Swift LeetCode 目錄 | Catalog

序        號	題名Title	難度     Difficulty
1	兩數之和 | Two Sum	Easy
2	兩數相加 | Add Two Numbers	Medium
3	無重複字符的最長子串 | Longest Substring Without Repeating Characters	Medium
4	兩個排序數組的中位數 | Median of Two Sorted Arrays	Hard
5	最長迴文子串 | Longest Palindromic Substring	Medium
6	Z字形變換 | ZigZag Conversion	Medium
7	反轉整數 | Reverse Integer	Easy
8	字符串轉整數 (atoi) | String to Integer (atoi)	Medium
9	迴文數 | Palindrome Number	Easy
10	正則表達式匹配 | Regular Expression Matching	Hard
11	盛最多水的容器 | Container With Most Water	Medium
12	整數轉羅馬數字 | Integer to Roman	Medium
13	羅馬數字轉整數 | Roman to Integer	Easy
14	最長公共前綴 | Longest Common Prefix	Easy
15	三數之和 | 3Sum	Medium
16	最接近的三數之和 | 3Sum Closest	Medium
17	電話號碼的字母組合 | Letter Combinations of a Phone Number	Medium
18	四數之和 | 4Sum	Medium
19	刪除鏈表的倒數第N個節點 | Remove Nth Node From End of List	Medium
20	有效的括號 | Valid Parentheses	Easy
21	合併兩個有序鏈表 | Merge Two Sorted Lists	Easy
22	括號生成 | Generate Parentheses	Medium
23	合併K個排序鏈表 | Merge k Sorted Lists	Hard
24	兩兩交換鏈表中的節點 | Swap Nodes in Pairs	Medium
25	k個一組翻轉鏈表 | Reverse Nodes in k-Group	Hard
26	刪除排序數組中的重複項 | Remove Duplicates from Sorted Array	Easy
27	移除元素 | Remove Element	Easy
28	實現strStr() | Implement strStr()	Easy
29	兩數相除 | Divide Two Integers	Medium
30	與全部單詞相關聯的字串 | Substring with Concatenation of All Words	Hard
31	下一個排列 | Next Permutation	Medium
32	最長有效括號 | Longest Valid Parentheses	Hard
33	搜索旋轉排序數組 | Search in Rotated Sorted Array	Medium
34	在排序數組中查找元素的第一個和最後一個位置 | Find First and Last Position of Element in Sorted Array	Medium
35	搜索插入位置 | Search Insert Position	Easy
36	有效的數獨 | Valid Sudoku	Medium
37	解數獨 | Sudoku Solver	Hard
38	報數 | Count and Say	Easy
39	組合總和 | Combination Sum	Medium
40	組合總和 II | Combination Sum II	Medium
41	缺失的第一個正數 | First Missing Positive	Hard
42	接雨水 | Trapping Rain Water	Hard
43	字符串相乘 | Multiply Strings	Medium
44	通配符匹配 | Wildcard Matching	Hard
45	跳躍遊戲 II | Jump Game II	Hard
46	全排列 | Permutations	Medium
47	全排列 II | Permutations II	Medium
48	旋轉圖像 | Rotate Image	Medium
49	字母異位詞分組 | Group Anagrams	Medium
50	Pow(x, n) | Pow(x, n)	Medium
51	N皇后 | N-Queens	Hard
52	N皇后 II | N-Queens II	Hard
53	最大子序和 | Maximum Subarray	Easy
54	螺旋矩陣 | Spiral Matrix	Medium
55	跳躍遊戲 | Jump Game	Medium
56	合併區間 | Merge Intervals	Medium
57	插入區間 | Insert Interval	Hard
58	最後一個單詞的長度 | Length of Last Word	Easy
59	螺旋矩陣 II | Spiral Matrix II	Medium
60	第k個排列 | Permutation Sequence	Medium
61	旋轉鏈表 | Rotate List	Medium
62	不一樣路徑 | Unique Paths	Medium
63	不一樣路徑 II | Unique Paths II	Medium
64	最小路徑和 | Minimum Path Sum	Medium
65	有效數字 | Valid Number	Hard
66	加一 | Plus One	Easy
67	二進制求和 | Add Binary	Easy
68	文本左右對齊 | Text Justification	Hard
69	x 的平方根 | Sqrt(x)	Easy
70	爬樓梯 | Climbing Stairs	Easy
71	簡化路徑 | Simplify Path	Medium
72	編輯距離 | Edit Distance	Hard
73	矩陣置零 | Set Matrix Zeroes	Medium
74	搜索二維矩陣 | Search a 2D Matrix	Medium
75	顏色分類 | Sort Colors	Medium
76	最小覆蓋子串 | Minimum Window Substring	Hard
77	組合 | Combinations	Medium
78	子集 | Subsets	Medium
79	單詞搜索 | Word Search	Medium
80	刪除排序數組中的重複項 II | Remove Duplicates from Sorted Array II	Medium
81	搜索旋轉排序數組 II | Search in Rotated Sorted Array II	Medium
82	刪除排序鏈表中的重複元素 II | Remove Duplicates from Sorted List II	Medium
83	刪除排序鏈表中的重複元素 | Remove Duplicates from Sorted List	Easy
84	柱狀圖中最大的矩形 | Largest Rectangle in Histogram	Hard
85	最大矩形 | Maximal Rectangle	Hard
86	分隔鏈表 | Partition List	Medium
87	擾亂字符串 | Scramble String	Hard
88	合併兩個有序數組 | Merge Sorted Array	Easy
89	格雷編碼 | Gray Code	Medium
90	子集 II | Subsets II	Medium
91	解碼方法 | Decode Ways	Medium
92	反轉鏈表 II | Reverse Linked List II	Medium
93	復原IP地址 | Restore IP Addresses	Medium
94	二叉樹的中序遍歷 | Binary Tree Inorder Traversal	Medium
95	不一樣的二叉搜索樹 II | Unique Binary Search Trees II	Medium
96	不一樣的二叉搜索樹 | Unique Binary Search Trees	Medium
97	交錯字符串 | Interleaving String	Medium
98	驗證二叉搜索樹 | Validate Binary Search Tree	Medium
99	恢復二叉搜索樹 | Recover Binary Search Tree	Medium
100	相同的樹 | Same Tree	Hard
101	對稱二叉樹 | Symmetric Tree	Easy
102	二叉樹的層次遍歷 | Binary Tree Level Order Traversal	Medium
103	二叉樹的鋸齒形層次遍歷 | Binary Tree Zigzag Level Order Traversal	Medium
104	二叉樹的最大深度 | Maximum Depth of Binary Tree	Easy
105	從前序與中序遍歷序列構造二叉樹 | Construct Binary Tree from Preorder and Inorder Traversal	Medium
106	從中序與後序遍歷序列構造二叉樹 | Construct Binary Tree from Inorder and Postorder Traversal	Medium
107	二叉樹的層次遍歷 II | Binary Tree Level Order Traversal II	Easy
108	將有序數組轉換爲二叉搜索樹 | Convert Sorted Array to Binary Search Tree	Easy
109	有序鏈表轉換二叉搜索樹 | Convert Sorted List to Binary Search Tree	Medium
110	平衡二叉樹 | Balanced Binary Tree	Easy
111	二叉樹的最小深度 | Minimum Depth of Binary Tree	Easy
112	路徑總和 | Path Sum	Easy
113	路徑總和 II | Path Sum II	Medium
114	二叉樹展開爲鏈表 | Flatten Binary Tree to Linked List	Medium
115	不一樣的子序列 | Distinct Subsequences	Hard
116	填充同一層的兄弟節點 | Populating Next Right Pointers in Each Node	Medium
117	填充同一層的兄弟節點 II | Populating Next Right Pointers in Each Node II	Medium
118	楊輝三角 | Pascal's Triangle	Easy
119	楊輝三角 II | Pascal's Triangle II	Easy
120	三角形最小路徑和 | Triangle	Medium
121	買賣股票的最佳時機 I | Best Time to Buy and Sell Stock	Easy
122	買賣股票的最佳時機 II | Best Time to Buy and Sell Stock II	Easy
123	買賣股票的最佳時機 III | Best Time to Buy and Sell Stock III	Hard
124	二叉樹中的最大路徑和 | Binary Tree Maximum Path Sum	Hard
125	驗證迴文串 | Valid Palindrome	Easy
126	單詞接龍 II | Word Ladder II	Hard
127	單詞接龍 | Word Ladder	Medium
128	最長連續序列 | Longest Consecutive Sequence	Hard
129	求根到葉子節點數字之和 | Sum Root to Leaf Numbers	Medium
130	被圍繞的區域 | Surrounded Regions	Medium
131	分割回文串 | Palindrome Partitioning	Medium
132	分割回文串 II | Palindrome Partitioning II	Hard
133	克隆圖 | Clone Graph	Medium
134	加油站 | Gas Station	Medium
135	分發糖果 | Candy	Hard
136	只出現一次的數字 | Single Number	Easy
137	只出現一次的數字 II | Single Number II	Medium
138	複製帶隨機指針的鏈表 | Copy List with Random Pointer	Medium
139	單詞拆分 | Word Break	Medium
140	單詞拆分 II | Word Break II	Hard
141	環形鏈表 | Linked List Cycle	Easy
142	環形鏈表 II | Linked List Cycle II	Medium
143	重排鏈表 | Reorder List	Medium
144	二叉樹的前序遍歷 | Binary Tree Preorder Traversal	Medium
145	二叉樹的後序遍歷 | Binary Tree Postorder Traversal	Hard
146	LRU緩存機制 | LRU Cache	Hard
147	對鏈表進行插入排序 | Insertion Sort List	Medium
148	排序鏈表 | Sort List	Medium
149	直線上最多的點數 | Max Points on a Line	Hard
150	逆波蘭表達式求值 | Evaluate Reverse Polish Notation	Medium
151	翻轉字符串裏的單詞 | Reverse Words in a String	Medium
152	乘積最大子序列 | Maximum Product Subarray	Medium
153	尋找旋轉排序數組中的最小值 | Find Minimum in Rotated Sorted Array	Medium
154	尋找旋轉排序數組中的最小值 II | Find Minimum in Rotated Sorted Array II	Hard
155	最小棧 | Min Stack	Easy
156	二叉樹的上下顛倒 $ Binary Tree Upside Down	Medium
157	用Read4來讀取N個字符 $ Read N Characters Given Read4	Easy
158	用Read4來讀取N個字符II $ Read N Characters Given Read4 II	Hard
159	具備最多兩個不一樣字符的最長子串 $ Longest Substring with At Most Two Distinct Characters	Hard
160	相交鏈表 | Intersection of Two Linked Lists	Easy
161	一次編輯距離 $ One Edit Distance	Medium
162	尋找峯值 | Find Peak Element	Medium
163	缺失區間 $ Missing Ranges	Medium
164	最大間距 | Maximum Gap	Hard
165	比較版本號 | Compare Version Numbers	Medium
166	分數到小數 | Fraction to Recurring Decimal	Medium
167	兩數之和 II - 輸入有序數組 | Two Sum II - Input array is sorted	Easy
168	Excel表列名稱 | Excel Sheet Column Title	Easy
169	求衆數 | Majority Element	Easy
170	兩數之和之三 - 數據結構設計 $ Two Sum III - Data structure design	Easy
171	Excel表列序號 | Excel Sheet Column Number	Easy
172	階乘後的零 | Factorial Trailing Zeroes	Easy
173	二叉搜索樹迭代器 | Binary Search Tree Iterator	Medium
174	地下城遊戲 | Dungeon Game	Hard
175	組合兩個表 | Combine Two Tables	Easy
176	第二高的薪水 | Second Highest Salary	Easy
177	第N高的薪水 | Nth Highest Salary	Medium
178	分數排名 | Rank Scores	Medium
179	最大數 | Largest Number	Medium
180	連續出現的數字 | Consecutive Numbers	Medium
181	超過經理收入的員工 | Employees Earning More Than Their Managers	Easy
182	查找重複的電子郵箱 | Duplicate Emails	Easy
183	從不訂購的客戶 | Customers Who Never Order	Easy
184	部門工資最高的員工 | Department Highest Salary	Medium
185	部門工資前三高的員工 | Department Top Three Salaries	Hard
186	翻轉字符串中的單詞 II $ Reverse Words in a String II	Medium
187	重複的DNA序列 | Repeated DNA Sequences	Medium
188	買賣股票的最佳時機 IV | Best Time to Buy and Sell Stock IV	Hard
189	旋轉數組 | Rotate Array	Easy
190	顛倒二進制位 | Reverse Bits	Easy
191	位1的個數 | Number of 1 Bits	Easy
192	統計詞頻 | Word Frequency	Medium
193	有效電話號碼 | Valid Phone Numbers	Easy
194	轉置文件 | Transpose File	Medium
195	第十行 | Tenth Line	Easy
196	刪除重複的電子郵箱 | Delete Duplicate Emails	Easy
197	上升的溫度 | Rising Temperature	Easy
198	打家劫舍 | House Robber	Easy
199	二叉樹的右視圖 | Binary Tree Right Side View	Medium
200	島嶼的個數 | Number of Islands	Medium
201	數字範圍按位與 | Bitwise AND of Numbers Range	Medium
202	快樂數 | Happy Number	Easy
203	移除鏈表元素 | Remove Linked List Elements	Easy
204	計數質數 | Count Primes	Easy
205	同構字符串 | Isomorphic Strings	Easy
206	反轉鏈表 | Reverse Linked List	Easy
207	課程表 | Course Schedule	Medium
208	實現 Trie (前綴樹) | Implement Trie (Prefix Tree)	Medium
209	長度最小的子數組 | Minimum Size Subarray Sum	Medium
210	課程表 II | Course Schedule II	Medium
211	添加與搜索單詞 - 數據結構設計 | Add and Search Word - Data structure design	Medium
212	單詞搜索 II | Word Search II	Hard
213	打家劫舍 II | House Robber II	Medium
214	最短迴文串 | Shortest Palindrome	Hard
215	數組中的第K個最大元素 | Kth Largest Element in an Array	Medium
216	組合總和 III | Combination Sum III	Medium
217	存在重複元素 | Contains Duplicate	Easy
218	天際線問題 | The Skyline Problem	Hard
219	存在重複元素 II | Contains Duplicate II	Easy
220	存在重複元素 III | Contains Duplicate III	Medium
221	最大正方形 | Maximal Square	Medium
222	徹底二叉樹的節點個數 | Count Complete Tree Nodes	Medium
223	矩形面積 | Rectangle Area	Medium
224	基本計算器 | Basic Calculator	Hard
225	用隊列實現棧 | Implement Stack using Queues	Easy
226	翻轉二叉樹 | Invert Binary Tree	Easy
227	基本計算器 II | Basic Calculator II	Medium
228	彙總區間 | Summary Ranges	Medium
229	求衆數 II | Majority Element II	Medium
230	二叉搜索樹中第K小的元素 | Kth Smallest Element in a BST	Medium
231	2的冪 | Power of Two	Easy
232	用棧實現隊列 | Implement Queue using Stacks	Easy
233	數字1的個數 | Number of Digit One	Hard
234	迴文鏈表 | Palindrome Linked List	Easy
235	二叉搜索樹的最近公共祖先 | Lowest Common Ancestor of a Binary Search Tree	Easy
236	二叉樹的最近公共祖先 | Lowest Common Ancestor of a Binary Tree	Medium
237	刪除鏈表中的節點 | Delete Node in a Linked List	Easy
238	除自身之外數組的乘積 | Product of Array Except Self	Medium
239	滑動窗口最大值 | Sliding Window Maximum	Hard
240	搜索二維矩陣 II | Search a 2D Matrix II	Medium
241	爲運算表達式設計優先級 | Different Ways to Add Parentheses	Medium
242	有效的字母異位詞 | Valid Anagram	Easy
243	最短單詞距離 $ Shortest Word Distance	Easy
244	最短單詞距離 II $ Shortest Word Distance II	Medium
245	最短單詞距離 III $ Shortest Word Distance III	Medium
246	對稱數 $ Strobogrammatic Number	Easy
247	對稱數 II $ Strobogrammatic Number II	Medium
248	對稱數 III $ Strobogrammatic Number III	Hard
249	羣組偏移字符串 $ Group Shifted Strings	Medium
250	計數相同值子樹的個數 $ Count Univalue Subtrees	Medium
251	展平二維向量 $ Flatten 2D Vector	Medium
252	會議室 $ Meeting Rooms	Easy
253	會議室 II $ Meeting Rooms II	Medium
254	因子組合 $ Factor Combinations	Medium
255	驗證二叉搜索樹的先序序列 $ Verify Preorder Sequence in Binary Search Tree	Medium
256	粉刷房子 $ Paint House	Easy
257	二叉樹的全部路徑 | Binary Tree Paths	Easy
258	各位相加 | Add Digits	Easy
259	三數之和較小值 $ 3Sum Smaller	Medium
260	只出現一次的數字 III | Single Number III	Medium
261	圖驗證樹 $ Graph Valid Tree	Medium
262	行程和用戶 | Trips and Users	Hard
263	醜數 | Ugly Number	Easy
264	醜數 II | Ugly Number II	Medium
265	粉刷房子 II $ Paint House II	Hard
266	迴文全排列 $ Palindrome Permutation	Easy
267	迴文全排列 II $ Palindrome Permutation II	Medium
268	缺失數字 | Missing Number	Easy
269	外星人詞典 $ Alien Dictionary	Hard
270	最近的二分搜索樹的值 $ Closest Binary Search Tree Value	Easy
271	加碼解碼字符串 $ Encode and Decode Strings	Medium
272	最近的二分搜索樹的值 II $ Closest Binary Search Tree Value II	Hard
273	整數轉換英文表示 | Integer to English Words	Hard
274	H指數 | H-Index	Medium
275	H指數 II | H-Index II	Medium
276	粉刷柵欄 $ Paint Fence	Easy
277	尋找名人 $ Find the Celebrity	Medium
278	第一個錯誤的版本 | First Bad Version	Easy
279	徹底平方數 | Perfect Squares	Medium
280	擺動排序 $ Wiggle Sort	Medium
281	之字形迭代器 $ Zigzag Iterator	Medium
282	給表達式添加運算符 | Expression Add Operators	Hard
283	移動零 | Move Zeroes	Easy
284	頂端迭代器 | Peeking Iterator	Medium
285	二叉搜索樹中的中序後繼節點 $ Inorder Successor in BST	Medium
286	牆和門 $ Walls and Gates	Medium
287	尋找重複數 | Find the Duplicate Number	Medium
288	惟一單詞縮寫 $ Unique Word Abbreviation	Medium
289	生命遊戲 | Game of Life	Medium
290	單詞模式 | Word Pattern	Easy
291	單詞模式 II $ Word Pattern II	Hard
292	Nim遊戲 | Nim Game	Easy
293	翻轉游戲 $ Flip Game	Easy
294	翻轉游戲之 II $ Flip Game II	Medium
295	數據流的中位數 | Find Median from Data Stream	Hard
296	最佳開會地點 $ Best Meeting Point	Hard
297	二叉樹的序列化與反序列化 | Serialize and Deserialize Binary Tree	Hard
298	二叉樹最長連續序列 $ Binary Tree Longest Consecutive Sequence	Medium
299	猜數字遊戲 | Bulls and Cows	Medium
300	最長上升子序列 | Longest Increasing Subsequence	Medium
301	刪除無效的括號 | Remove Invalid Parentheses	Hard
302	包含黑色像素的最小矩形 $ Smallest Rectangle Enclosing Black Pixels	Hard
303	區域和檢索 - 數組不可變 | Range Sum Query - Immutable	Easy
304	二維區域和檢索 - 矩陣不可變 | Range Sum Query 2D - Immutable	Medium
305	島嶼的個數 II $ Number of Islands II	Hard
306	累加數 | Additive Number	Medium
307	區域和檢索 - 數組可修改 | Range Sum Query - Mutable	Medium
308	二維區域和檢索 - 可變 $ Range Sum Query 2D - Mutable	Hard
309	最佳買賣股票時機含冷凍期 | Best Time to Buy and Sell Stock with Cooldown	Medium
310	最小高度樹 | Minimum Height Trees	Medium
311	稀疏矩陣相乘 $ Sparse Matrix Multiplication	Medium
312	戳氣球 | Burst Balloons	Hard
313	超級醜數 | Super Ugly Number	Medium
314	二叉樹的豎直遍歷 $ Binary Tree Vertical Order Traversal	Medium
315	計算右側小於當前元素的個數 | Count of Smaller Numbers After Self	Hard
316	去除重複字母 | Remove Duplicate Letters	Hard
317	建築物的最短距離 $ Shortest Distance from All Buildings	Hard
318	最大單詞長度乘積 | Maximum Product of Word Lengths	Medium
319	燈泡開關 | Bulb Switcher	Medium
320	通用簡寫 $ Generalized Abbreviation	Medium
321	拼接最大數 | Create Maximum Number	Hard
322	零錢兌換 | Coin Change	Medium
323	無向圖中的連通區域的個數 $ Number of Connected Components in an Undirected Graph	Medium
324	擺動排序 II | Wiggle Sort II	Medium
325	最大子數組之和爲k $ Maximum Size Subarray Sum Equals k	Medium
326	3的冪 | Power of Three	Easy
327	區間和的個數 | Count of Range Sum	Hard
328	奇偶鏈表 | Odd Even Linked List	Medium
329	矩陣中的最長遞增路徑 | Longest Increasing Path in a Matrix	Hard
330	按要求補齊數組 | Patching Array	Hard
331	驗證二叉樹的前序序列化 | Verify Preorder Serialization of a Binary Tree	Medium
332	從新安排行程 | Reconstruct Itinerary	Medium
333	最大的二分搜索子樹 $ Largest BST Subtree	Medium
334	遞增的三元子序列 | Increasing Triplet Subsequence	Medium
335	路徑交叉 | Self Crossing	Hard
336	迴文對 | Palindrome Pairs	Hard
337	打家劫舍 III | House Robber III	Medium
338	比特位計數 | Counting Bits	Medium
339	嵌套鏈表權重和 $ Nested List Weight Sum	Easy
340	最多有K個不一樣字符的最長子串 $ Longest Substring with At Most K Distinct Characters	Hard
341	壓平嵌套鏈表迭代器 | Flatten Nested List Iterator	Medium
342	4的冪 | Power of Four	Easy
343	整數拆分 | Integer Break	Medium
344	反轉字符串 | Reverse String	Easy
345	反轉字符串中的元音字母 | Reverse Vowels of a String	Easy
346	從數據流中移動平均值 $ Moving Average from Data Stream	Easy
347	前K個高頻元素 | Top K Frequent Elements	Medium
348	設計井字棋遊戲 $ Design Tic-Tac-Toe	Medium
349	兩個數組的交集 | Intersection of Two Arrays	Easy
350	兩個數組的交集 II | Intersection of Two Arrays II	Easy
351	安卓解鎖模式 $ Android Unlock Patterns	Medium
352	將數據流變爲多個不相交間隔 | Data Stream as Disjoint Intervals	Hard
353		Medium
354	俄羅斯套娃信封問題 | Russian Doll Envelopes	Hard
355		Medium
356		Medium
357	計算各個位數不一樣的數字個數 | Count Numbers with Unique Digits	Medium
358		Hard
359		Easy
360		Medium
361		Medium
362		Medium
363	矩形區域不超過 K 的最大數值和 | Max Sum of Rectangle No Larger Than K	Hard
364		Medium
365	水壺問題 | Water and Jug Problem	Medium
366		Medium
367	有效的徹底平方數 | Valid Perfect Square	Easy
368	最大整除子集 | Largest Divisible Subset	Medium
369		Medium
370		Medium
371	兩整數之和 | Sum of Two Integers	Easy
372	超級次方 | Super Pow	Medium
373	查找和最小的K對數字 | Find K Pairs with Smallest Sums	Medium
374	猜數字大小 | Guess Number Higher or Lower	Easy
375	猜數字大小 II | Guess Number Higher or Lower II	Medium
376	擺動序列 | Wiggle Subsequence	Medium
377	組合總和 Ⅳ | Combination Sum IV	Medium
378	有序矩陣中第K小的元素 | Kth Smallest Element in a Sorted Matrix	Medium
379		Medium
380	常數時間插入、刪除和獲取隨機元素 | Insert Delete GetRandom O(1)	Medium
381	O(1) 時間插入、刪除和獲取隨機元素 - 容許重複 | Insert Delete GetRandom O(1) - Duplicates allowed	Hard
382	鏈表隨機節點 | Linked List Random Node	Medium
383	贖金信 | Ransom Note	Easy
384	打亂數組 | Shuffle an Array	Medium
385	迷你語法分析器 | Mini Parser	Medium
386	字典序排數 | Lexicographical Numbers	Medium
387	字符串中的第一個惟一字符 | First Unique Character in a String	Easy
388	文件的最長絕對路徑 | Longest Absolute File Path	Medium
389	找不一樣 | Find the Difference	Easy
390	消除遊戲 | Elimination Game	Medium
391	完美矩形 | Perfect Rectangle	Hard
392	判斷子序列 | Is Subsequence	Medium
393	UTF-8 編碼驗證 | UTF-8 Validation	Medium
394	字符串解碼 | Decode String	Medium
395	至少有K個重複字符的最長子串 | Longest Substring with At Least K Repeating Characters	Medium
396	旋轉函數 | Rotate Function	Medium
397	整數替換 | Integer Replacement	Medium
398	隨機數索引 | Random Pick Index	Medium
399	除法求值 | Evaluate Division	Medium
400	第N個數字 | Nth Digit	Easy
401	二進制手錶 | Binary Watch	Easy
402	移掉K位數字 | Remove K Digits	Medium
403	青蛙過河 | Frog Jump	Hard
404	左葉子之和 | Sum of Left Leaves	Easy
405	數字轉換爲十六進制數 | Convert a Number to Hexadecimal	Easy
406	根據身高重建隊列 | Queue Reconstruction by Height	Medium
407	接雨水 II | Trapping Rain Water II	Hard
408		Easy
409	最長迴文串 | Longest Palindrome	Easy
410	分割數組的最大值 | Split Array Largest Sum	Hard
411		Hard
412	Fizz Buzz	Easy
413	等差數列劃分 | Arithmetic Slices	Medium
414	第三大的數 | Third Maximum Number	Easy
415	字符串相加 | Add Strings	Easy
416	分割等和子集 | Partition Equal Subset Sum	Medium
417	太平洋大西洋水流問題 | Pacific Atlantic Water Flow	Medium
418		Medium
419	甲板上的戰艦 | Battleships in a Board	Medium
420	強密碼檢驗器 | Strong Password Checker	Hard
421	數組中兩個數的最大異或值 | Maximum XOR of Two Numbers in an Array	Medium
422		Easy
423	從英文中重建數字 | Reconstruct Original Digits from English	Medium
424	替換後的最長重複字符 | Longest Repeating Character Replacement	Medium
425		Hard
426		Medium
427		Easy
428		Hard
429		Easy
430		Medium
431		Hard
432	全 O(1) 的數據結構 | All O`one Data Structure	Hard
433	最小基因變化 | Minimum Genetic Mutation	Medium
434	字符串中的單詞數 | Number of Segments in a String	Easy
435	無重疊區間 | Non-overlapping Intervals	Medium
436	尋找右區間 | Find Right Interval	Medium
437	路徑總和 III | Path Sum III	Easy
438	找到字符串中全部字母異位詞 | Find All Anagrams in a String	Easy
439		Medium
440	字典序的第K小數字 | K-th Smallest in Lexicographical Order	Hard
441	排列硬幣 | Arranging Coins	Easy
442	數組中重複的數據 | Find All Duplicates in an Array	Medium
443	壓縮字符串 | String Compression	Easy
444		Medium
445	兩數相加 II | Add Two Numbers II	Medium
446	等差數列劃分 II - 子序列 | Arithmetic Slices II - Subsequence	Hard
447	迴旋鏢的數量 | Number of Boomerangs	Easy
448	找到全部數組中消失的數字 | Find All Numbers Disappeared in an Array	Easy
449		Medium
450	刪除二叉搜索樹中的節點 | Delete Node in a BST	Medium
451	根據字符出現頻率排序 | Sort Characters By Frequency	Medium
452	用最少數量的箭引爆氣球 | Minimum Number of Arrows to Burst Balloons	Medium
453	最小移動次數使數組元素相等 | Minimum Moves to Equal Array Elements	Easy
454	四數相加 II | 4Sum II	Medium
455	分發餅乾 | Assign Cookies	Easy
456	132模式 | 132 Pattern	Medium
457	環形數組循環 | Circular Array Loop	Medium
458	可憐的小豬 | Poor Pigs	Hard
459	重複的子字符串 | Repeated Substring Pattern	Easy
460	LFU緩存 | LFU Cache	Hard
461	漢明距離 | Hamming Distance	Easy
462	最少移動次數使數組元素相等 II | Minimum Moves to Equal Array Elements II	Medium
463	島嶼的周長 | Island Perimeter	Easy
464	我能贏嗎 | Can I Win	Medium
465		Hard
466	統計重複個數 | Count The Repetitions	Hard
467	環繞字符串中惟一的子字符串 | Unique Substrings in Wraparound String	Medium
468	驗證IP地址 | Validate IP Address	Medium
469		Medium
470	用 Rand7() 實現 Rand10() | Implement Rand10() Using Rand7()	Medium
471		Hard
472	鏈接詞 | Concatenated Words	Hard
473	火柴拼正方形 | Matchsticks to Square	Medium
474	一和零 | Ones and Zeroes	Medium
475	供暖器 | Heaters	Easy
476	數字的補數 | Number Complement	Easy
477	漢明距離總和 | Total Hamming Distance	Medium
478	在圓內隨機生成點 | Generate Random Point in a Circle	Medium
479	最大回文數乘積 | Largest Palindrome Product	Hard
480	滑動窗口中位數 | Sliding Window Median	Hard
481	神奇字符串 | Magical String	Medium
482	密鑰格式化 | License Key Formatting	Easy
483	最小好進制 | Smallest Good Base	Hard
484		Medium
485	最大連續1的個數 | Max Consecutive Ones	Easy
486	預測贏家 | Predict the Winner	Medium
487		Medium
488	祖瑪遊戲 | Zuma Game	Hard
489		Hard
490		Medium
491	遞增子序列 | Increasing Subsequences	Medium
492	構造矩形 | Construct the Rectangle	Easy
493	翻轉對 | Reverse Pairs	Hard
494	目標和 | Target Sum	Medium
495	提莫攻擊 | Teemo Attacking	Medium
496	下一個更大元素 I | Next Greater Element I	Easy
497	非重疊矩形中的隨機點 | Random Point in Non-overlapping Rectangles	Medium
498	對角線遍歷 | Diagonal Traverse	Medium
499		Hard
500	鍵盤行 | Keyboard Row	Easy
501	二叉搜索樹中的衆數 | Find Mode in Binary Search Tree	Easy
502	IPO(首次公開募股) | Initial Public Offerings	Hard
503	下一個更大元素 II | Next Greater Element II	Medium
504	七進制數 | Base 7	Easy
505		Medium
506	相對名次 | Relative Ranks	Easy
507	完美數 | Perfect Number	Easy
508	出現次數最多的子樹元素和 | Most Frequent Subtree Sum	Medium
509	斐波那契數 | Fibonacci Number	Easy
510		Medium
511		Medium
512		Medium
513	找樹左下角的值 | Find Bottom Left Tree Value	Medium
514	自由之路 | Freedom Trail	Hard
515	在每一個樹行中找最大值 | Find Largest Value in Each Tree Row	Medium
516	最長迴文子序列 | Longest Palindromic	Medium
517	超級洗衣機 | Super Washing Machines	Hard
518	零錢兌換 II | Coin Change 2	Medium
519	隨機翻轉矩陣 | Random Flip Matrix	Medium
520	檢測大寫字母 | Detect Capital	Easy
521	最長特殊序列 Ⅰ | Longest Uncommon Subsequence I	Easy
522	最長特殊序列 II | Longest Uncommon Subsequence II	Medium
523	連續的子數組和 | Continuous Subarray Sum	Medium
524	經過刪除字母匹配到字典裏最長單詞 | Longest Word in Dictionary through Deleting	Medium
525	連續數組 | Contiguous Array	Medium
526	優美的排列 | Beautiful Arrangement	Medium
527		Hard
528	按權重隨機選擇 | Random Pick with Weight	Medium
529	掃雷遊戲 | Minesweeper	Medium
530	二叉搜索樹的最小絕對差 | Minimum Absolute Difference in BST	Easy
531		Medium
532	數組中的K-diff數對 | K-diff Pairs in an Array	Easy
533		Medium
534		Medium
535		Medium
536		Medium
537	複數乘法 | Complex Number Multiplication	Medium
538	把二叉搜索樹轉換爲累加樹 | Convert BST to Greater Tree	Easy
539	最小時間差 | Minimum Time Difference	Medium
540	有序數組中的單一元素 | Single Element in a Sorted Array	Medium
541	反轉字符串 II | Reverse String II	Easy
542	01 矩陣 | 01 Matrix	Medium
543	二叉樹的直徑 | Diameter of Binary Tree	Easy
544		Medium
545		Medium
546	移除盒子 | Remove Boxes	Hard
547	朋友圈 | Friend Circles	Medium
548		Medium
549		Medium
550		Medium
551	學生出勤紀錄 I | Student Attendance Record I	Easy
552	學生出勤記錄 II | Student Attendance Record II	Hard
553	最優除法 | Optimal Division	Medium
554	磚牆 | Brick Wall	Medium
555		Medium
556	下一個更大元素 III | Next Greater Element III	Medium
557	反轉字符串中的單詞 III | Reverse Words in a String III	Easy
558		Easy
559		Easy
560	和爲K的子數組 | Subarray Sum Equals K	Medium
561	數組拆分 I | Array Partition I	Easy
562		Medium
563	二叉樹的坡度 | Binary Tree Tilt	Easy
564	尋找最近的迴文數 | Find the Closest Palindrome	Hard
565	數組嵌套 | Array Nesting	Medium
566	重塑矩陣 | Reshape the Matrix	Easy
567	字符串的排列 | Permutation in String	Medium
568		Hard
569		Hard
570		Medium
571		Hard
572	另外一個樹的子樹 | Subtree of Another Tree	Easy
573		Medium
574		Medium
575	分糖果 | Distribute Candies	Easy
576	出界的路徑數 | Out of Boundary Paths	Medium
577	員工獎金 | Employee Bonus	Easy
578		Medium
579		Hard
580		Medium
581	最短無序連續子數組 | Shortest Unsorted Continuous Subarray	Easy
582		Medium
583	兩個字符串的刪除操做 | Delete Operation for Two Strings	Medium
584		Easy
585		Medium
586		Easy
587	安裝柵欄 | Erect the Fence	Hard
588		Hard
589		Easy
590		Easy
591	標籤驗證器 | Tag Validator	Hard
592	分數加減運算 | Fraction Addition and Subtraction	Medium
593	有效的正方形 | Valid Square	Medium
594	最長和諧子序列 | Longest Harmonious Subsequence	Easy
595	大的國家 | Big Countries	Easy
596	超過5名學生的課 | Classes More Than 5 Students	Easy
597		Easy
598	範圍求和 II | Range Addition II	Easy
599	兩個列表的最小索引總和 | Minimum Index Sum of Two Lists	Easy
600	不含連續1的非負整數 | Non-negative Integers without Consecutive Ones	Hard
601	體育館的人流量 | Human Traffic of Stadium	Hard
602		Medium
603		Easy
604		Easy
605	種花問題 | Can Place Flowers	Easy
606	根據二叉樹建立字符串 | Construct String from Binary Tree	Easy
607		Easy
608		Medium
609	在系統中查找重複文件 | Find Duplicate File in System	Medium
610		Easy
611	有效三角形的個數 | Valid Triangle Number	Medium
612		Medium
613		Easy
614		Medium
615		Hard
616		Medium
617	合併二叉樹 | Merge Two Binary Trees	Easy
618		Hard
619		Easy
620	有趣的電影 | Not Boring Movies	Easy
621	任務調度器 | Task Scheduler	Medium
622	設計循環隊列 | Design Circular Queue	Medium
623	在二叉樹中增長一行 | Add One Row to Tree	Medium
624		Easy
625		Medium
626	換座位 | Exchange Seats	Medium
627	交換工資 | Swap Salary	Easy
628	三個數的最大乘積 | Maximum Product of Three Numbers	Easy
629	K個逆序對數組 | K Inverse Pairs Array	Hard
630	課程表 III | Course Schedule III	Hard
631		Hard
632	最小區間 | Smallest Range	Hard
633	平方數之和 | Sum of Square Numbers	Easy
634		Medium
635		Medium
636	函數的獨佔時間 | Exclusive Time of Functions	Medium
637	二叉樹的層平均值 | Average of Levels in Binary Tree	Easy
638	大禮包 | Shopping Offers	Medium
639	解碼方法 2 | Decode Ways II	Hard
640	求解方程 | Solve the Equation	Medium
641	設計循環雙端隊列 | Design Circular Deque	Medium
642		Hard
643	子數組最大平均數 I | Maximum Average Subarray I	Easy
644		Hard
645	錯誤的集合 | Set Mismatch	Easy
646	最長數對鏈 | Maximum Length of Pair Chain	Medium
647	迴文子串 | Palindromic Substrings	Medium
648	單詞替換 | Replace Words	Medium
649	Dota2 參議院 | Dota2 Senate	Medium
650	只有兩個鍵的鍵盤 | 2 Keys Keyboard	Medium
651		Medium
652	尋找重複的子樹 | Find Duplicate Subtrees	Medium
653	兩數之和 IV - 輸入 BST | Two Sum IV - Input is a BST	Easy
654	最大二叉樹 | Maximum Binary Tree	Medium
655	輸出二叉樹 | Print Binary Tree	Medium
656		Hard
657	機器人可否返回原點 | Robot Return to Origin	Easy
658	找到 K 個最接近的元素 | Find K Closest Elements	Medium
659	分割數組爲連續子序列 | Split Array into Consecutive Subsequences	Medium
660		Hard
661	圖片平滑器 | Image Smoother	Easy
662	二叉樹最大寬度 | Maximum Width of Binary Tree	Medium
663		Medium
664	奇怪的打印機 | Strange Printer	Medium
665	非遞減數列 | Non-decreasing Array	Medium
666		Medium
667	優美的排列 II | Beautiful Arrangement II	Medium
668	乘法表中第k小的數 | Kth Smallest Number in Multiplication Table	Hard
669	修剪二叉搜索樹 | Trim a Binary Search Tree	Easy
670	最大交換 | Maximum Swap	Medium
671	二叉樹中第二小的節點 | Second Minimum Node In a Binary Tree	Easy
672	燈泡開關 Ⅱ | Bulb Switcher II	Medium
673	最長遞增子序列的個數 | Number of Longest Increasing Subsequence	Medium
674	最長連續遞增序列 | Longest Continuous Increasing Subsequence	Easy
675	爲高爾夫比賽砍樹 | Cut Off Trees for Golf Event	Hard
676	實現一個魔法字典 | Implement Magic Dictionary	Medium
677	鍵值映射 | Map Sum Pairs	Medium
678	有效的括號字符串 | Valid Parenthesis String	Medium
679	24點遊戲 | 24 Game	Medium
680	驗證迴文字符串 Ⅱ | Valid Palindrome II	Easy
681		Medium
682	棒球比賽 | Baseball Game	Easy
683		Hard
684	冗餘鏈接 | Redundant Connection	Medium
685	冗餘鏈接 II | Redundant Connection II	Hard
686	重複疊加字符串匹配 | Repeated String Match	Easy
687	最長同值路徑 | Longest Univalue Path	Easy
688	「馬」在棋盤上的機率 | Knight Probability in Chessboard	Medium
689	三個無重疊子數組的最大和 | Maximum Sum of 3 Non-Overlapping Subarrays	Hard
690	員工的重要性 | Employee Importance	Easy
691	貼紙拼詞 | Stickers to Spell Word	Hard
692	前K個高頻單詞 | Top K Frequent Words	Medium
693	交替位二進制數 | Binary Number with Alternating Bits	Easy
694		Medium
695	島嶼的最大面積 | Max Area of Island	Medium
696	計數二進制子串 | Count Binary Substrings	Easy
697	數組的度 | Degree of an Array	Easy
698	劃分爲k個相等的子集 | Partition to K Equal Sum Subsets	Medium
699	掉落的方塊 | Falling Squares	Hard
700	二叉搜索樹中的搜索 | Search in a Binary Search Tree	Easy
701	二叉搜索樹中的插入操做 | Insert into a Binary Search Tree	Medium
702		Medium
703	數據流中的第K大元素 | Kth Largest Element in a Stream	Easy
704	二分查找 | Binary Search	Easy
705	設計哈希集合 | Design HashSet	Easy
706	設計哈希映射 | Design HashMap	Easy
707	設計鏈表 | Design Linked List	Easy
708		Medium
709	轉換成小寫字母 | To Lower Case	Easy
710	黑名單中的隨機數 | Random Pick with Blacklist	Hard
711		Hard
712	兩個字符串的最小ASCII刪除和 | Minimum ASCII Delete Sum for Two Strings	Medium
713	乘積小於K的子數組 | Subarray Product Less Than K	Medium
714	買賣股票的最佳時機含手續費 | Best Time to Buy and Sell Stock with Transaction Fee	Medium
715	Range 模塊 | Range Module	Hard
716		Easy
717	1比特與2比特字符 | 1-bit and 2-bit Characters	Easy
718	最長重複子數組 | Maximum Length of Repeated Subarray	Medium
719	找出第 k 小的距離對 | Find K-th Smallest Pair Distance	Hard
720	詞典中最長的單詞 | Longest Word in Dictionary	Easy
721	帳戶合併 | Accounts Merge	Medium
722	刪除註釋 | Remove Comments	Medium
723		Medium
724	尋找數組的中心索引 | Find Pivot Index	Easy
725	分隔鏈表 | Split Linked List in Parts	Medium
726	原子的數量 | Number of Atoms	Hard
727		Hard
728	自除數 | Self Dividing Numbers	Easy
729	個人日程安排表 I | My Calendar I	Medium
730	統計不一樣迴文子字符串 | Count Different Palindromic Subsequences	Hard
731	個人日程安排表 II | My Calendar II	Medium
732	個人日程安排表 III | My Calendar III	Hard
733	圖像渲染 | Flood Fill	Easy
734		Easy
735	行星碰撞 | Asteroid Collision	Medium
736	Lisp 語法解析 | Parse Lisp Expression	Medium
737		Medium
738	單調遞增的數字 | Monotone Increasing Digits	Medium
739	每日溫度 | Daily Temperatures	Medium
740	刪除與得到點數 | Delete and Earn	Medium
741	摘櫻桃 | Cherry Pickup	Hard
742		Medium
743	網絡延遲時間 | Network Delay Time	Medium
744	尋找比目標字母大的最小字母 | Find Smallest Letter Greater Than Target	Easy
745	前綴和後綴搜索 | Prefix and Suffix Search	Hard
746	使用最小花費爬樓梯 | Min Cost Climbing Stairs	Easy
747	至少是其餘數字兩倍的最大數 | Largest Number At Least Twice of Others	Easy
748	最短完整詞 | Shortest Completing Word	Easy
749	隔離病毒 | Contain Virus	Hard
750		Medium
751		Easy
752	打開轉盤鎖 | Open the Lock	Medium
753	破解保險箱 | Cracking the Safe	Hard
754	到達終點數字 | Reach a Number	Easy
755		Medium
756	金字塔轉換矩陣 | Pyramid Transition Matrix	Medium
757	設置交集大小至少爲2 | Set Intersection Size At Least Two	Hard
758		Easy
759		Hard
760		Easy
761	特殊的二進制序列 | Special Binary String	Hard
762	二進制表示中質數個計算置位 | Prime Number of Set Bits in Binary Representation	Easy
763	劃分字母區間 | Partition Labels	Medium
764	最大加號標誌 | Largest Plus Sign	Medium
765	情侶牽手 | Couples Holding Hands	Hard
766	託普利茨矩陣 | Toeplitz Matrix	Easy
767	重構字符串 | Reorganize String	Medium
768	最多能完成排序的塊 II | Max Chunks To Make Sorted II	Hard
769	最多能完成排序的塊 | Max Chunks To Make Sorted	Medium
770	基本計算器 IV | Basic Calculator IV	Hard
771	寶石與石頭 | Jewels and Stones	Easy
772		Hard
773	滑動謎題 | Sliding Puzzle	Hard
774		Hard
775	全局倒置與局部倒置 | Global and Local Inversions	Medium
776		Medium
777	在LR字符串中交換相鄰字符 | Swap Adjacent in LR String	Medium
778	水位上升的泳池中游泳 | Swim in Rising Water	Hard
779	第K個語法符號 | K-th Symbol in Grammar	Medium
780	到達終點 | Reaching Points	Hard
781	森林中的兔子 | Rabbits in Forest	Medium
782	變爲棋盤 | Transform to Chessboard	Hard
783	二叉搜索樹結點最小距離 | Minimum Distance Between BST Nodes	Easy
784	字母大小寫全排列 | Letter Case Permutation	Easy
785	判斷二分圖 | Is Graph Bipartite?	Medium
786	第 K 個最小的素數分數 | K-th Smallest Prime Fraction	Hard
787	K 站中轉內最便宜的航班 | Cheapest Flights Within K Stops	Medium
788	旋轉數字 | Rotated Digits	Easy
789	逃脫阻礙者 | Escape The Ghosts	Medium
790	多米諾和托米諾平鋪 | Domino and Tromino Tiling	Medium
791	自定義字符串排序 | Custom Sort String	Medium
792	匹配子序列的單詞數 | Number of Matching Subsequences	Medium
793	階乘函數後K個零 | Preimage Size of Factorial Zeroes Function	Hard
794	有效的井字遊戲 | Valid Tic-Tac-Toe State	Medium
795	區間子數組個數 | Number of Subarrays with Bounded Maximum	Medium
796	旋轉字符串 | Rotate String	Easy
797	全部可能的路徑 | All Paths From Source to Target	Medium
798	得分最高的最小輪調 | Smallest Rotation with Highest Score	Hard
799	香檳塔 | Champagne Tower	Medium
800		Easy
801	使序列遞增的最小交換次數 | Minimum Swaps To Make Sequences Increasing	Medium
802	找到最終的安全狀態 | Find Eventual Safe States	Medium
803	打磚塊 | Bricks Falling When Hit	Hard
804	惟一摩爾斯密碼詞 | Unique Morse Code Words	Easy
805	數組的均值分割 | Split Array With Same Average	Hard
806	寫字符串須要的行數 | Number of Lines To Write String	Easy
807	保持城市天際線 | Max Increase to Keep City Skyline	Medium
808	分湯 | Soup Servings	Medium
809	情感豐富的文字 | Expressive Words	Medium
810	黑板異或遊戲 | Chalkboard XOR Game	Hard
811	子域名訪問計數 | Subdomain Visit Count	Easy
812	最大三角形面積 | Largest Triangle Area	Easy
813	最大平均值和的分組 | Largest Sum of Averages	Medium
814	二叉樹剪枝 | Binary Tree Pruning	Medium
815	公交路線 | Bus Routes	Hard
816	模糊座標 | Ambiguous Coordinates	Medium
817	鏈表組件 | Linked List Components	Medium
818	賽車 | Race Car	Hard
819	最多見的單詞 | Most Common Word	Easy
820	單詞的壓縮編碼 | Short Encoding of Words	Medium
821	字符的最短距離 | Shortest Distance to a Character	Easy
822	翻轉卡片遊戲 | Card Flipping Game	Medium
823	帶因子的二叉樹 | Binary Trees With Factors	Medium
824	山羊拉丁文 | Goat Latin	Easy
825	適齡的朋友 | Friends Of Appropriate Ages	Medium
826	安排工做以達到最大收益 | Most Profit Assigning Work	Medium
827	最大人工島 | Making A Large Island	Hard
828	獨特字符串 | Unique Letter String	Hard
829	連續整數求和 | Consecutive Numbers Sum	Hard
830	較大分組的位置 | Positions of Large Groups	Easy
831	隱藏我的信息 | Masking Personal Information	Medium
832	翻轉圖像 | Flipping an Image	Easy
833	字符串中的查找與替換 | Find And Replace in String	Medium
834	樹中距離之和 | Sum of Distances in Tree	Hard
835	圖像重疊 | Image Overlap	Medium
836	矩形重疊 | Rectangle Overlap	Easy
837	新21點 | New 21 Game	Medium
838	推多米諾 | Push Dominoes	Medium
839	類似字符串組 | Similar String Groups	Hard
840	矩陣中的幻方 | Magic Squares In Grid	Easy
841	鑰匙和房間 | Keys and Rooms	Medium
842	將數組拆分紅斐波那契序列 | Split Array into Fibonacci Sequence	Medium
843	猜猜這個單詞 | Guess the Word	Hard
844	比較含退格的字符串 | Backspace String Compare	Easy
845	數組中的最長山脈 | Longest Mountain in Array	Medium
846	一手順子 | Hand of Straights	Medium
847	訪問全部節點的最短路徑 | Shortest Path Visiting All Nodes	Hard
848	字母移位 | Shifting Letters	Medium
849	到最近的人的最大距離 | Maximize Distance to Closest Person	Easy
850	矩形面積 II | Rectangle Area II	Hard
851	喧鬧和富有 | Loud and Rich	Medium
852	山脈數組的峯頂索引 | Peak Index in a Mountain Array	Easy
853	車隊 | Car Fleet	Medium
854	類似度爲 K 的字符串 | K-Similar Strings	Hard
855	考場就座 | Exam Room	Medium
856	括號的分數 | Score of Parentheses	Medium
857	僱傭 K 名工人的最低成本 | Minimum Cost to Hire K Workers	Hard
858	鏡面反射 | Mirror Reflection	Medium
859	親密字符串 | Buddy Strings	Easy
860	檸檬水找零 | Lemonade Change	Easy
861	翻轉矩陣後的得分 | Score After Flipping Matrix	Medium
862	和至少爲 K 的最短子數組 | Shortest Subarray with Sum at Least K	Hard
863	二叉樹中全部距離爲 K 的結點 | All Nodes Distance K in Binary Tree	Medium
864	獲取全部鑰匙的最短路徑 | Shortest Path to Get All Keys	Hard
865	具備全部最深結點的最小子樹 | Smallest Subtree with all the Deepest Nodes	Medium
866	迴文素數 | Prime Palindrome	Medium
867	轉置矩陣 | Transpose Matrix	Easy
868	二進制間距 | Binary Gap	Easy
869	從新排序獲得 2 的冪 | Reordered Power of 2	Medium
870	優點洗牌 | Advantage Shuffle	Medium
871	最低加油次數 | Minimum Number of Refueling Stops	Hard
872	葉子類似的樹 | Leaf-Similar Trees	Easy
873	最長的斐波那契子序列的長度 | Length of Longest Fibonacci Subsequence	Medium
874	模擬行走機器人 | Walking Robot Simulation	Easy
875	愛吃香蕉的珂珂 | Koko Eating Bananas	Medium
876	鏈表的中間結點 | Middle of the Linked List	Easy
877	石子游戲 | Stone Game	Medium
878	第 N 個神奇數字 | Nth Magical Number	Hard
879	盈利計劃 | Profitable Schemes	Hard
880	索引處的解碼字符串 | Decoded String at Index	Medium
881	救生艇 | Boats to Save People	Medium
882	細分圖中的可到達結點 | Reachable Nodes In Subdivided Graph	Hard
883	三維形體投影面積 | Projection Area of 3D Shapes	Easy
884	兩句話中的不常見單詞 | Uncommon Words from Two Sentences	Easy
885	螺旋矩陣 III | Spiral Matrix III	Medium
886	可能的二分法 | Possible Bipartition	Medium
887	雞蛋掉落 | Super Egg Drop	Hard
888	公平的糖果交換 | Fair Candy Swap	Easy
889	根據前序和後序遍歷構造二叉樹 | Construct Binary Tree from Preorder and Postorder Traversal	Medium
890	查找和替換模式 | Find and Replace Pattern	Medium
891	子序列寬度之和 | Sum of Subsequence Widths	Hard
892	三維形體的表面積 | Surface Area of 3D Shapes	Easy
893	特殊等價字符串組 | Groups of Special-Equivalent Strings	Easy
894	全部可能的滿二叉樹 | All Possible Full Binary Trees	Medium
895	最大頻率棧 | Maximum Frequency Stack	Hard
896	單調數列 | Monotonic Array	Easy
897	遞增順序查找樹 | Increasing Order Search Tree	Easy
898	子數組按位或操做 | Bitwise ORs of Subarrays	Medium
899	有序隊列 | Orderly Queue	Hard
900	RLE 迭代器 | RLE Iterator	Medium
901	股票價格跨度 | Online Stock Span	Medium
902	最大爲 N 的數字組合 | Numbers At Most N Given Digit Set	Hard
903	DI 序列的有效排列 | Valid Permutations for DI Sequence	Hard
904	水果成籃 | Fruit Into Baskets	Medium
905	按奇偶排序數組 | Sort Array By Parity	Easy
906	超級迴文數 | Super Palindromes	Hard
907	子數組的最小值之和 | Sum of Subarray Minimums	Medium
908	最小差值 I | Smallest Range I	Easy
909	蛇梯棋 | Snakes and Ladders	Medium
910	最小差值 II | Smallest Range II	Medium
911	在線選舉 | Online Election	Medium
912	排序數組 | Sort an Array	Medium
913	貓與老鼠 | Cat and Mouse	Hard
914	一副牌中的X | X of a Kind in a Deck of Cards	Easy
915	將分區數組分紅不相交的間隔 | Partition Array into Disjoint Intervals	Medium
916	單詞子集 | Word Subsets	Medium
917	僅僅反轉字母 | Reverse Only Letters	Easy
918	環形子數組的最大和 | Maximum Sum Circular Subarray	Medium
919	徹底二叉樹插入器 | Complete Binary Tree Inserter	Medium
920	播放列表的數量 | Number of Music Playlists	Hard
921	使括號有效的最少添加 | Minimum Add to Make Parentheses Valid	Medium
922	按奇偶排序數組 II | Sort Array By Parity II	Easy
923	三數之和的多種可能 | 3Sum With Multiplicity	Medium
924	儘可能減小惡意軟件的傳播 | Minimize Malware Spread	Hard
925	長按鍵入 | Long Pressed Name	Easy
926	將字符串翻轉到單調遞增 | Flip String to Monotone Increasing	Medium
927	三等分 | Three Equal Parts	Hard
928	儘可能減小惡意軟件的傳播 II | Minimize Malware Spread II	Hard
929	獨特的電子郵件地址 | Unique Email Addresses	Easy
930	和相同的二元子數組 | Binary Subarrays With Sum	Medium
931	降低路徑最小和 | Minimum Falling Path Sum	Medium
932	漂亮數組 | Beautiful Array	Medium
933	最近的請求次數 | Number of Recent Calls	Easy
934	最短的橋 | Shortest Bridge	Medium
935	騎士撥號器 | Knight Dialer	Medium
936	戳印序列 | Stamping The Sequence	Hard
937	從新排列日誌文件 | Reorder Log Files	Easy
938	二叉搜索樹的範圍和 | Range Sum of BST	Medium
939	最小面積矩形 | Minimum Area Rectangle	Medium
940	不一樣的子序列 II | Distinct Subsequences II	Hard
941	有效的山脈數組 | Valid Mountain Array	Easy
942	增減字符串匹配 | DI String Match	Easy
943	最短超級串 | Find the Shortest Superstring	Hard
944	刪除列以使之有序 | Delete Columns to Make Sorted	Easy
945	使數組惟一的最小增量 | Minimum Increment to Make Array Unique	Medium
946	驗證棧序列 | Validate Stack Sequences	Medium
947	移除最多的同行或同列石頭 | Most Stones Removed with Same Row or Column	Medium
948	令牌放置 | Bag of Tokens	Medium
949	給定數字能組成的最大時間 | Largest Time for Given Digits	Easy
950	按遞增順序顯示卡牌 | Reveal Cards In Increasing Order	Medium
951	翻轉等價二叉樹 | Flip Equivalent Binary Trees	Medium
952	按公因數計算最大組件大小 | Largest Component Size by Common Factor	Hard
953	驗證外星語詞典 | Verifying an Alien Dictionary	Easy
954	二倍數對數組 | Array of Doubled Pairs	Medium
955	刪列造序 II | Delete Columns to Make Sorted II	Medium
956	最高的廣告牌 | Tallest Billboard	Hard
957	N天后的牢房 | Prison Cells After N Days	Medium
958	二叉樹的徹底性檢驗 | Check Completeness of a Binary Tree	Medium
959	由斜槓劃分區域 | Regions Cut By Slashes	Medium
960	刪列造序 III | Delete Columns to Make Sorted III	Hard
961	重複 N 次的元素 | N-Repeated Element in Size 2N Array	Easy
962	最大寬度坡 | Maximum Width Ramp	Medium
963	最小面積矩形 II | Minimum Area Rectangle II	Medium
964	表示數字的最少運算符 | Least Operators to Express Number	Hard
965	單值二叉樹 | Univalued Binary Tree	Easy
966	元音拼寫檢查器 | Vowel Spellchecker	Medium
967	連續差相同的數字 | Numbers With Same Consecutive Differences	Medium
968	監控二叉樹 | Binary Tree Cameras	Hard
969	煎餅排序 | Pancake Sorting	Medium
970	強整數 | Powerful Integers	Easy
971	翻轉二叉樹以匹配先序遍歷 | Flip Binary Tree To Match Preorder Traversal	Medium
972	相等的有理數 | Equal Rational Numbers	Hard
973	最接近原點的 K 個點 | K Closest Points to Origin	Medium
974	和可被 K 整除的子數組 | Subarray Sums Divisible by K	Medium
975	奇偶跳 | Odd Even Jump	Hard
976	三角形的最大周長 | Largest Perimeter Triangle	Easy
977	有序數組的平方 | Squares of a Sorted Array	Easy
978	最長湍流子數組 | Longest Turbulent Subarray	Medium
979	在二叉樹中分配硬幣 | Distribute Coins in Binary Tree	Medium
980	不一樣路徑 III | Unique Paths III	Hard
981	基於時間的鍵值存儲 | Time Based Key-Value Store	Medium
982	按位與爲零的三元組 | Triples with Bitwise AND Equal To Zero	Hard
983	最低票價 | Minimum Cost For Tickets	Medium
984	不含 AAA 或 BBB 的字符串 | String Without AAA or BBB	Medium
985	查詢後的偶數和 | Sum of Even Numbers After Queries	Easy
986	區間列表的交集 | Interval List Intersections	Medium
987	二叉樹的垂序遍歷 | Vertical Order Traversal of a Binary Tree	Medium
988	從葉結點開始的最小字符串 | Smallest String Starting From Leaf	Medium
989	數組形式的整數加法 | Add to Array-Form of Integer	Easy
990	等式方程的可知足性 | Satisfiability of Equality Equations	Medium
991	壞了的計算器 | Broken Calculator	Medium
992	K 個不一樣整數的子數組 | Subarrays with K Different Integers	Hard
993	二叉樹的堂兄弟節點 | Cousins in Binary Tree	Easy
994	腐爛的橘子 | Rotting Oranges	Easy
995	K 連續位的最小翻轉次數 | Minimum Number of K Consecutive Bit Flips	Hard
996	正方形數組的數目 | Number of Squareful Arrays	Hard
997	找到小鎮的法官 | Find the Town Judge	Easy
998	最大二叉樹 II | Maximum Binary Tree II	Medium
999	車的可用捕獲量 | Available Captures for Rook	Easy
1000	合併石頭的最低成本 | Minimum Cost to Merge Stones	Hard
1001	網格照明 | Grid Illumination	Hard
1002	查找經常使用字符 | Find Common Characters	Easy
1003	檢查替換後的詞是否有效 | Check If Word Is Valid After Substitutions	Medium
1004	最大連續1的個數 III | Max Consecutive Ones III	Medium
1005	K 次取反後最大化的數組和 | Maximize Sum Of Array After K Negations	Easy
1006	笨階乘 | Clumsy Factorial	Medium
1007	行相等的最少多米諾旋轉 | Minimum Domino Rotations For Equal Row	Medium
1008	先序遍歷構造二叉樹 | Construct Binary Search Tree from Preorder Traversal	Medium
1009	十進制整數的補碼 | Complement of Base 10 Integer	Easy
1010	總持續時間可被 60 整除的歌曲 | Pairs of Songs With Total Durations Divisible by 60	Easy
1011	在 D 天內送達包裹的能力 | Capacity To Ship Packages Within D Days	Medium
1012	至少有 1 位重複的數字 | Numbers With 1 Repeated Digit	Hard
1013	將數組分紅和相等的三個部分 | Partition Array Into Three Parts With Equal Sum	Easy
1014	最佳觀光組合 | Best Sightseeing Pair	Medium
1015	可被 K 整除的最小整數 | Smallest Integer Divisible by K	Medium
1016	子串能表示從 1 到 N 數字的二進制串 | Binary String With Substrings Representing 1 To N	Medium
1017	負二進制轉換 | Convert to Base -2	Medium
1018	可被 5 整除的二進制前綴 | Binary Prefix Divisible By 5	Easy
1019	鏈表中的下一個更大節點 | Next Greater Node In Linked List	Medium
1020	飛地的數量 | Number of Enclaves	Medium
1021	刪除最外層的括號 | Remove Outermost Parentheses	Easy
1022	從根到葉的二進制數之和 | Sum of Root To Leaf Binary Numbers	Easy
1023	駝峯式匹配 | Camelcase Matching	Medium
1024	視頻拼接 | Video Stitching	Medium
1025	除數博弈 | Divisor Game	Easy
1026	節點與其祖先之間的最大差值 | Maximum Difference Between Node and Ancestor	Medium
1027	最長等差數列 | Longest Arithmetic Sequence	Medium
1028	從先序遍歷還原二叉樹 | Recover a Tree From Preorder Traversal	Hard
1029	兩地調度 | Two City Scheduling	Easy
1030	距離順序排列矩陣單元格 | Matrix Cells in Distance Order	Easy
1031	兩個非重疊子數組的最大和 | Maximum Sum of Two Non-Overlapping Subarrays	Medium
1032	字符流 | Stream of Characters	Hard
1033	移動石子直到連續 | Moving Stones Until Consecutive	Easy
1034	邊框着色 | Coloring A Border	Medium
1035	不相交的線 | Uncrossed Lines	Medium
1036	逃離大迷宮 | Escape a Large Maze	Hard
1037	有效的迴旋鏢 | Valid Boomerang	Easy
1038	從二叉搜索樹到更大和樹 | Binary Search Tree to Greater Sum Tree	Medium
1039	多邊形三角剖分的最低得分 | Minimum Score Triangulation of Polygon	Medium
1040	移動石子直到連續 II | Moving Stones Until Consecutive II	Medium
1041	困於環中的機器人 | Robot Bounded In Circle	Easy
1042	不鄰接植花 | Flower Planting With No Adjacent	Easy
1043	分隔數組以獲得最大和 | Partition Array for Maximum Sum	Medium
1044	最長重複子串 | Longest Duplicate Substring	Hard
1045	購買全部產品的客戶 | Customers Who Bought All Products	Medium
1046	最後一塊石頭的重量 | Last Stone Weight	Easy
1047	刪除字符串中的全部相鄰重複項 | Remove All Adjacent Duplicates In String	Easy
1048	最長字符串鏈 | Longest String Chain	Medium
1049	最後一塊石頭的重量 II | Last Stone Weight II	Medium
1050	合做至少三次的演員和導演 | Actors and Directors Who Cooperated At Least Three Times	Easy
1051	高度檢查器 | Height Checker	Easy
1052	愛生氣的書店老闆 | Grumpy Bookstore Owner	Medium
1053	交換一次的先前排列 | Previous Permutation With One Swap	Medium
1054	距離相等的條形碼 | Distant Barcodes	Medium
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064	不動點 | Fixed Point	Easy
1065	字符串的索引對 | Index Pairs of a String	Easy
1066	校園自行車分配 II | Campus Bikes II	Medium
1067	範圍內的數字計數 | Digit Count in Range	Hard
1068
1069
1070
1071	字符串的最大公因子 | Greatest Common Divisor of Strings	Easy
1072	按列翻轉獲得最大值等行數 | Flip Columns For Maximum Number of Equal Rows	Medium
1073	負二進制數相加 | Adding Two Negabinary Numbers	Medium
1074	元素和爲目標值的子矩陣數量 | Number of Submatrices That Sum to Target	Hard
1075
1076
1077
1078	Bigram 分詞 | Occurrences After Bigram	Easy
1079	活字印刷 | Letter Tile Possibilities	Medium
1080	根到葉路徑上的不足節點 | Insufficient Nodes in Root to Leaf Paths	Medium
1081	不一樣字符的最小子序列 | Smallest Subsequence of Distinct Characters	Medium
1082
1083
1084
1085	最小元素各數位之和 | Sum of Digits in the Minimum Number	Easy
1086	前五科的均分 | High Five	Easy
1087	字母切換 | Permutation of Letters	Medium
1088	易混淆數 II | Confusing Number II	Hard
1089	複寫零 | Duplicate Zeros	Easy
1090	受標籤影響的最大值 | Largest Values From Labels	Medium
1091	二進制矩陣中的最短路徑 | Shortest Path in Binary Matrix	Medium
1092	最短公共超序列 | Shortest Common Supersequence	Hard
1093	大樣本統計 | Statistics from a Large Sample	Medium
1094	拼車 | Car Pooling	Medium
1095	山脈數組中查找目標值 | Find in Mountain Array	Hard
1096	花括號展開 II | Brace Expansion II	Hard
1097		Hard
1098		Medium
1099	小於 K 的兩數之和 | Two Sum Less Than K	Easy
1100	長度爲 K 的無重複字符子串 | Find K-Length Substrings With No Repeated Characters	Medium
1101	彼此熟識的最先時間 | The Earliest Moment When Everyone Become Friends	Medium
1102	得分最高的路徑 | Path With Maximum Minimum Value	Medium
1103	分糖果 II | Distribute Candies to People	Easy
1104	二叉樹尋路 | Path In Zigzag Labelled Binary Tree	Easy
1105	填充書架 | Filling Bookcase Shelves	Medium
1106	解析布爾表達式 | Parsing A Boolean Expression	Hard
1107		Medium
1108	IP 地址無效化 | Defanging an IP Address	Easy
1109	航班預訂統計 | Corporate Flight Bookings	Medium
1110	刪點成林 | Delete Nodes And Return Forest	Medium
1111	有效括號的嵌套深度 | Maximum Nesting Depth of Two Valid Parentheses Strings	Medium
1112		Medium
1113		Easy
1114	按序打印 | Print in Order	Easy
1115	交替打印FooBar | Print FooBar Alternately	Medium
1116	打印零與奇偶數 | Print Zero Even Odd	Medium
1117	H2O 生成 | Building H2O	Hard
1118	一月有多少天 | Number of Days in a Month	Easy
1119	刪去字符串中的元音 | Remove Vowels from a String	Easy
1120	子樹的最大平均值 | Maximum Average Subtree	Medium
1121	將數組分紅幾個遞增序列 | Divide Array Into Increasing Sequences	Hard
1122	數組的相對排序 | Relative Sort Array	Easy
1123	最深葉節點的最近公共祖先 | Lowest Common Ancestor of Deepest Leaves	Medium
1124	表現良好的最長時間段 | Longest Well-Performing Interval	Medium
1125	最小的必要團隊 | Smallest Sufficient Team	Hard
1126
1127
1128	等價多米諾骨牌對的數量 | Number of Equivalent Domino Pairs	Easy
1129	顏色交替的最短路徑 | Shortest Path with Alternating Colors	Medium
1130	葉值的最小代價生成樹 | Minimum Cost Tree From Leaf Values	Medium
1131	絕對值表達式的最大值 | Maximum of Absolute Value Expression	Medium
1132		Medium
1133	最大惟一數 | Largest Unique Number	Easy
1134	阿姆斯特朗數 | Armstrong Number	Easy
1135	最低成本聯通全部城市 | Connecting Cities With Minimum Cost	Medium
1136	平行課程 | Parallel Courses	Hard
1137	第 N 個泰波那契數 | N-th Tribonacci Number	Easy
1138	字母板上的路徑 | Alphabet Board Path	Medium
1139	最大的以 1 爲邊界的正方形 | Largest 1-Bordered Square	Medium
1140	石子游戲 II | Stone Game II	Medium
1141
1142
1143	最長公共子序列 | Longest Common Subsequence	Medium
1144	遞減元素使數組呈鋸齒狀 | Decrease Elements To Make Array Zigzag	Medium
1145	二叉樹着色遊戲 | Binary Tree Coloring Game	Medium
1146	快照數組 | Snapshot Array	Medium
1147	段式迴文 | Longest Chunked Palindrome Decomposition	Hard
1148		Easy
1149		Medium
1150	檢查一個數是否在數組中佔絕大多數 | Check If a Number Is Majority Element in a Sorted Array	Easy
1151	最少交換次數來組合全部的 1 | Minimum Swaps to Group All 1's Together	Medium
1152	用戶網站訪問行爲分析 | Analyze User Website Visit Pattern	Medium
1153	字符串轉化 | String Transforms Into Another String	Hard
1154	一年中的第幾天 | Ordinal Number Of Date	Easy
1155	擲骰子的N種方法 | Number of Dice Rolls With Target Sum	Medium
1156	單字符重複子串的最大長度 | Swap For Maximum Repeated Substring	Medium
1157	子數組中佔絕大多數的元素 | Online Majority Element In Subarray	Hard
1158		Medium
1159		Hard
1160	拼寫單詞 | Find Words That Can Be Formed by Characters	Easy
1161	最大層內元素和 | Maximum Level Sum of a Binary Tree	Medium
1162	地圖分析 | As Far from Land as Possible	Medium
1163	按字典序排在最後的子串 | Last Substring in Lexicographical Order	Hard
1164		Medium
1165	單行鍵盤 | Single-Row Keyboard	Easy
1166	設計文件系統 | Design File System	Medium
1167	鏈接棒材的最低費用 | Minimum Cost to Connect Sticks	Medium
1168	水資源分配優化 | Optimize Water Distribution in a Village	Hard
1169	查詢無效交易 | Invalid Transactions	Easy
1170	比較字符串最小字母出現頻次 | Compare Strings by Frequency of the Smallest Character	Easy
1171	從鏈表中刪去總和值爲零的連續節點 | Remove Zero Sum Consecutive Nodes from Linked List	Hard
1172	餐盤棧 | Dinner Plate Stacks
1173
1174
1175	質數排列 | Prime Arrangements	Easy
1176	健身計劃評估 | Diet Plan Performance	Easy
1177	構建迴文串檢測 | Can Make Palindrome from Substring	Medium
1178	猜字謎 | Number of Valid Words for Each Puzzle	Hard
1179	從新格式化部門表 | Reformat Department Table	Easy
1180	統計只含單一字母的子串 ｜ Count Substrings with Only One Distinct Letter	Easy
1181	先後拼接 ｜ Before and After Puzzle	Medium
1182	與目標顏色間的最短距離 ｜ Shortest Distance to Target Color	Medium
1183	矩陣中 1 的最大數量 ｜ Maximum Number of Ones	Hard
1184	公交站間的距離 | Distance Between Bus Stops	Easy
1185	刪除一次獲得子數組最大和 | Maximum Subarray Sum with One Deletion	Easy
1186	一週中的第幾天 | Day of the Week	Medium
1187	使數組嚴格遞增 | Make Array Strictly Increasing	Hard
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200