旧巷听风丶 @ 2018-11-06 21:12:23

#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
    string s;
    cin>>s;
    reverse(s.begin(),s.end());
    while(s[0]=='0'&&s.size()>0)s.erase(0,1);
    cout<<s;
    return 0;
}

by 旧巷听风丶 @ 2018-11-06 21:12:47

刚学OI求助

by The_Stardust @ 2018-11-06 21:13:58

负号的问题吧

by The_Stardust @ 2018-11-06 21:14:23

hack 数据：-123

by YU401 @ 2018-11-06 21:17:04

#include<iostream>
#include<algorithm>
#include<cstring>
using namespace std;
int main()
{
    string s;
    cin>>s;
    reverse(s.begin(),s.end());
    while(s[0]=='0'&&s.size()>0)s.erase(0,1);
    if(s[0]>0)
    cout<<"-";
    for(int i=0;i<s.size()-1;i++)
    {
        cout<<s[i];
    }
    return 0;
}

by YU401 @ 2018-11-06 21:17:12

试一试

by YU401 @ 2018-11-06 21:24:38

不好意思写错了

by YU401 @ 2018-11-06 21:25:06

不要在意上面的程序

by 寒落 @ 2018-11-06 21:28:22

@旧巷听风丶 负数先把负号去掉（输出）就行了

by lycx03 @ 2019-02-15 16:26:47

注意下负数

by 飞友737ng @ 2019-08-27 14:24:52

include<bits/stdc++.h>

using namespace std; int main() { int a,b; cin>>a>>b; while(a!=0){ b=b*10; b=b+a%10; a=a/10; } cout<<b<<endl; }