[Swift]LeetCode1150. 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

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Given an array nums sorted in non-decreasing order, and a number target, return True if and only if target is a majority element.git

majority element is an element that appears more than N/2 times in an array of length Ngithub

Example 1:數組

Input: nums = [2,4,5,5,5,5,5,6,6], target = 5 Output: true Explanation: The value 5 appears 5 times and the length of the array is 9. Thus, 5 is a majority element because 5 > 9/2 is true. 

Example 2:微信

Input: nums = [10,100,101,101], target = 101 Output: false Explanation: The value 101 appears 2 times and the length of the array is 4. Thus, 101 is not a majority element because 2 > 4/2 is false. 

Note:app

  1. 1 <= nums.length <= 1000
  2. 1 <= nums[i] <= 10^9
  3. 1 <= target <= 10^9

給出一個按 非遞減 順序排列的數組 nums,和一個目標數值 target。假如數組 nums 中絕大多數元素的數值都等於 target,則返回 True,不然請返回 Falsespa

所謂佔絕大多數,是指在長度爲 N 的數組中出現必須 超過 N/2 次。 code

示例 1:htm

輸入:nums = [2,4,5,5,5,5,5,6,6], target = 5
輸出:true
解釋:
數字 5 出現了 5 次,而數組的長度爲 9。
因此,5 在數組中佔絕大多數,由於 5 次 > 9/2。

示例 2:blog

輸入:nums = [10,100,101,101], target = 101
輸出:false
解釋:
數字 101 出現了 2 次,而數組的長度是 4。
因此,101 不是 數組佔絕大多數的元素,由於 2 次 = 4/2。 

提示:

  1. 1 <= nums.length <= 1000
  2. 1 <= nums[i] <= 10^9
  3. 1 <= target <= 10^9

28 ms

 1 class Solution {
 2     func isMajorityElement(_ nums: [Int], _ target: Int) -> Bool {
 3         var cnt:Int = 0
 4         for x in nums
 5         {
 6             if x == target
 7             {
 8                 cnt += 1
 9             }
10         }
11         return cnt > nums.count/2        
12     }
13 }
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