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把它当字符串做了#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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