力扣题目链接 位运算
class Solution { public void reverseString(char[] s) { int l = 0; int r = s.length - 1; while(l<r){ s[l] ^= s[r];//s[l] = a^b s[r] ^= s[l];//s[r] = b^a^b = a; s[l] ^= s[r];//s[l] = a^b^a = b; l++; r--; } } }