PAT甲级 1027 Colors in Mars (20 分)

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

第一次写的，还不够精炼，对于数据理解还不够到位

#include <iostream>
#include <vector>

using namespace std;
char a[13] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C'};
int RGB[3];

int main() {
    int R, G, B;
    cin >> RGB[0] >> RGB[1] >> RGB[2];
    cout << "#";
    for (int i = 0; i < 3; ++i) {
        vector<char> v;
        do {
            v.push_back(a[RGB[i] % 13]);
            RGB[i] /= 13;
        } while (RGB[i]);
        if (v.size() == 1)
            cout << "0";
        for (int j = v.size() - 1; j >= 0; --j) {
            cout << v[j];
        }
    }


}

附上对数据理解后，更精炼的代码

#include <iostream>


using namespace std;
char a[13] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C'};


int main() {
    int R, G, B;
    cin >> R >> G >> B;
    cout << "#";
    cout << a[R / 13] << a[R % 13] << a[G / 13] << a[G % 13] << a[B / 13] << a[B % 13];
}