题目1015：还是A+B

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#include "iostream"#include "stdio.h"#include <vector>#include <cstring>#include <algorithm>#include <string>#include <string.h>#include <stack>using namespace std;//1015int a,b,k;int main(){    //freopen("input.txt","r",stdin);    while(cin>>a>>b>>k){        if(a==0&&b==0) break;        int t=a+b;        int x=0,y=0;        while(k--){            x=x*10+a%10;            a/=10;            y=y*10+b%10;            b/=10;        }        if(x==y)    printf("-1\n");        else        printf("%d\n",t);         }    return 0;}/**************************************************************    Problem: 1015    User: cust123    Language: C++    Result: Accepted    Time:0 ms    Memory:1520 kb****************************************************************/

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