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把它当字符串做了

Posted by 1004115224 at 2012-08-16 16:45:44 on Problem 3077
#include<iostream>
#include<string>
using namespace std;
int main()
{
    string a;
    int n;
    cin>>n;
    while(n--)
    {
        cin>>a;
        int l=a.length();
        if(l==1)cout<<a<<endl;
        else
        {
            for(int i=l-1;i>0;i--)
            {
                if(a[i]>='5')
                {
                    a[i]='0';
                    a[i-1]=a[i-1]+1;
                }
                else a[i]='0';
            }
            if(a[0]==':')
            {
                a[0]='0';
                cout<<1<<a<<endl;
            }
            else cout<<a<<endl;
        }
    }
    return 0;
}

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