還是A+B
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 9130 Accepted Submission(s): 4490
#include<iostream>
#include<cmath>
#include<cstdlib>
using namespace std;
int main(){
int a,b,n,k;
while(cin>>a>>b>>n,a!=0||b!=0){
k=pow(10,n);
if(abs(a-b)%k!=0) cout<<a+b<<endl;
else cout<<-1<<endl;
}
return 0;
}