左旋转字符串
- class Solution {
- public:
- string LeftRotateString(string str, int n) {
- if(str.length() == 0)
- return "";
- n = n % str.length();
- string left = str.substr(n,str.length()-n);
- string right = str.substr(0,n);
- string st = left + right;
- return st;
- }
- };