[Swift]LeetCode1016. 子串能表示從 1 到 N 數字的二進制串 | Binary String With Substrings Representing 1 To N

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➤微信公衆號:山青詠芝(shanqingyongzhi)
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➤GitHub地址:https://github.com/strengthen/LeetCode
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Given a binary string S (a string consisting only of '0' and '1's) and a positive integer N, return true if and only if for every integer X from 1 to N, the binary representation of X is a substring of S.git

Example 1:github

Input: S = "0110", N = 3 Output: true 

Example 2:微信

Input: S = "0110", N = 4 Output: false

Note:app

  1. 1 <= S.length <= 1000
  2. 1 <= N <= 10^9

給定一個二進制字符串 S(一個僅由若干 '0' 和 '1' 構成的字符串)和一個正整數 N,若是對於從 1 到 N 的每一個整數 X,其二進制表示都是 S 的子串,就返回 true,不然返回 falsespa

示例 1:code

輸入:S = "0110", N = 3
輸出:true

示例 2:htm

輸入:S = "0110", N = 4
輸出:false

提示:blog

  1. 1 <= S.length <= 1000
  2. 1 <= N <= 10^9

Runtime: 8 ms
Memory Usage: 20.4 MB
 1 class Solution {
 2     func queryString(_ S: String, _ N: Int) -> Bool {
 3         if N > 2400 {return false}
 4         for i in 1...N
 5         {
 6             var str:String = String()
 7             var x:Int = i
 8             while (x != 0)
 9             {
10                 str.append((x % 2 + 48).ASCII)
11                 x /= 2
12             }
13             str = String(str.reversed())
14             if !S.contains(str) {return false}
15         }
16         return true        
17     }
18 }
19 
20 //Int擴展
21 extension Int
22 {
23     //Int轉Character,ASCII值(定義大寫爲字符值)
24     var ASCII:Character 
25     {
26         get {return Character(UnicodeScalar(self)!)}
27     }
28 }
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