题解 | #左旋转字符串#
左旋转字符串
https://www.nowcoder.com/practice/12d959b108cb42b1ab72cef4d36af5ec?tpId=265&rp=1&ru=%2Fexam%2Foj%2Fta&qru=%2Fexam%2Foj%2Fta&sourceUrl=%2Fexam%2Foj%2Fta%3FjudgeStatus%3D3%26page%3D1%26pageSize%3D50%26search%3D%26tpId%3D13%26type%3D265&difficulty=&judgeStatus=3&tags=&title=&gioEnter=menu
观察字符串前后变化即可
class Solution {
public:
string LeftRotateString(string str, int n) {
if (str.empty() || n % str.size() == 0) {
return str;
}
n = n % str.size();
std::reverse(str.begin(), str.begin() + n);
std::reverse(str.begin() + n, str.end());
std::reverse(str.begin(), str.end());
return str;
}
};
