```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;
}
};