如题。
~~~
编译成功

测试数据 #0: Accepted, time = 15 ms, mem = 576 KiB, score = 10
测试数据 #1: WrongAnswer, time = 0 ms, mem = 580 KiB, score = 0
测试数据 #2: Accepted, time = 0 ms, mem = 576 KiB, score = 10
测试数据 #3: Accepted, time = 15 ms, mem = 580 KiB, score = 10
测试数据 #4: Accepted, time = 15 ms, mem = 576 KiB, score = 10
测试数据 #5: Accepted, time = 15 ms, mem = 576 KiB, score = 10
测试数据 #6: Accepted, time = 0 ms, mem = 576 KiB, score = 10
测试数据 #7: Accepted, time = 0 ms, mem = 572 KiB, score = 10
测试数据 #8: Accepted, time = 0 ms, mem = 576 KiB, score = 10
测试数据 #9: WrongAnswer, time = 0 ms, mem = 576 KiB, score = 0
WrongAnswer, time = 60 ms, mem = 580 KiB, score = 80
~~~

#include<iostream>
using namespace std;
int h,t;string s;
int main(){
    cin>>s;
    t=s.length();
    if(s[0]=='-'){
        cout<<'-';h++;
    }
    for(int i=t-1;i>h;i++){
        if(s[i]=='0') t--;
        else break;
    }
    for(int i=t-1;i>=h;i--) cout<<s[i];
}