LeetCode2710.移除字符串中的尾随零

```cpp
class Solution {
public:string removeTrailingZeros(string num) {int flag = 0;string s = num;int size = num.length();for (int i = num.length() - 1; i >= 0; i--) {if (num[i] != '0')break;if (num[i] == '0') {size--;}}s.resize(size);return s;}
};