已AC，代码：
```cpp
#include<bits/stdc++.h>
using namespace std;
int main() {
string a;
cin>>a;
int sum = 0;
if (a.size() == 1){
cout<<a[0];
return 0;
}
if (a[0] == '-'){
printf("-");
sum++;
}
int kley = 0;
for (int i = a.size() - 1;i >= sum;--i){
if (a[i] != '0' || kley >= 1){
cout<<a[i];
kley++;
}
}
return 0;
}
```
by mediocre_ @ 2022-08-17 20:44:03
那你还发什么？？不怕被抄？？
by xiazexuan @ 2022-08-17 20:50:13