PAT 1027 Colors in Mars

People in Mars represent the colors in their computers in a similar way as the Earth people. That is, a color is represented by a 6-digit number, where the first 2 digits are for Red, the middle 2 digits for Green, and the last 2 digits for Blue. The only difference is that they use radix 13 (0-9 and A-C) instead of 16. Now given a color in three decimal numbers (each between 0 and 168), you are supposed to output their Mars RGB values.

Input Specification:

Each input file contains one test case which occupies a line containing the three decimal color values.

Output Specification:

For each test case you should output the Mars RGB value in the following format: first output #, then followed by a 6-digit number where all the English characters must be upper-cased. If a single color is only 1-digit long, you must print a 0 to its left.

Sample Input:

15 43 71

Sample Output:

#123456

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define maxnum 100005

char s[3] = {‘A‘,‘B‘,‘C‘};


int main(){


    int a[3];
    for(int i=0;i < 3;i++) cin >> a[i];
    cout << "#";
    for(int i=0;i < 3;i++){
        vector<char> vec;
        if(a[i] == 0){cout << "00";continue;}
        while(a[i]){
            int num = a[i]%13;
            if(num < 10){vec.push_back(num+‘0‘);}
            else vec.push_back(s[num%10]);
            a[i] = a[i]/13;
        }
        if(vec.size() == 1) cout << 0;
        for(int i=vec.size()-1;i >= 0;i--){
            cout << vec[i];
        }
    }
    return 0;
}

——再次注意0这个数据，在进制转换中一直会出。