题解 100% AC

#include <bits/stdc++.h>
using namespace std;
int main(){
    string s;cin>>s;
    int cnt=s.length()-1;
    if(s[0]=='-')cout<<"-";
    while(s[cnt]=='0')cnt--;
    for(int i=cnt;i>=(s[0]=='-')?1:0;i--)cout<<s[i];
    return 0;
}