1022. D进制的A+B (20)

#include <iostream>
#include <vector> 
using namespace std;

int main()
{
    int A,B,k;
    cin>>A>>B>>k;
    int sum = A + B;
    vector<char> v;
    while ( sum != 0 ){
        int tmp = sum % k;
        v.push_back('0'+tmp);
        sum /= k;
    }
    vector<char>::reverse_iterator start = v.rbegin();
    vector<char>::reverse_iterator end = v.rend();
    if ( v.capacity() == 0){                    //注意V为空的情况 
        cout<<"0";
    }else{
        for (; start != end ; start++){
            cout<<*start;
        }   
    }

    return 0;
 }