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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; } Followed by:
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