LeetCode - Rotate String
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We are given two strings, A and B. A shift on A consists of taking string A and moving the leftmost character to the rightmost position. For example, if A = ‘abcde‘, then it will be ‘bcdea‘ after one shift on A. Return True if and only if A can become B after some number of shifts on A. Example 1: Input: A = ‘abcde‘, B = ‘cdeab‘ Output: true Example 2: Input: A = ‘abcde‘, B = ‘abced‘ Output: false Note: A and B will have length at most 100.
class Solution { public boolean rotateString(String A, String B) { if(A == null || B == null || A.length() != B.length()){ return false; } if(A.length() == 0 && B.length() == 0){ return true; } int n = A.length();
//轮数 for(int i = 0; i< n; i++){ boolean find = true;
//每一个元素 for(int j = 0; j < n; j++){ int a = A.charAt(j); int newIndex = (n - i + j) % n; int b = B.charAt(newIndex); if(a != b){ find = false; break; } } if(find){ return true; } } return false; } }
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