541. 反转字符串 II

541. 反转字符串 II

class Solution 
{
public:void Reverse(string& s, int start, int end){end--;while (start < end){swap(s[start], s[end]);start++;end--;}}string reverseStr(string s, int k){int len = s.size();for (int i = 0; i < len; i += 2 * k){if (i + k < len)Reverse(s, i, i + k);elseReverse(s, i, len);}return s;}
};