题解 | #还是A+B#
还是A+B
https://www.nowcoder.com/practice/8c3c5dae2c4a4266ba04f993a18e286b
#include <bits/stdc++.h>
using namespace std;
int main(){
string sa,sb;
int k;
while(cin>>sa>>sb>>k)
{
int res;
if(sa=="0"&&sb=="0") break;
int asize=sa.size();
int bsize=sb.size();
k=min(k,asize);
k=min(k,bsize);
if(sa.substr(sa.size()-k)==sb.substr(sb.size()-k)) res=-1;
else
{
res=stoi(sa)+stoi(sb);
}
cout<<res<<endl;
}
return 0;
}
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