hdoj/section2-7/main.cpp

#include <iostream>

using namespace std;

int calc(char *num) {
    int result = 0;
    for (int i = 0; num[i] != '\0'; i++) {
        if (num[i] >= '0' && num[i] <= '9') {
            result += num[i] - '0';
        } else if (num[i] >= 'A' && num[i] <= 'F') {
            result += num[i] - 'A' + 10;
        }
    }
    return result;
}

int duodecimal(int i) {
    char ch[20] = {'\0'};
    int result = 0;
    int count = 0, base = 12;
    for (; i != 0;) {
        int s = i % base;
        result += s;
        if (s >= 10) {
            ch[count] = 'A' + (s - 10);

        } else {
            ch[count] = '0' + s;
        }
        count++;
        i /= base;
    }
//    cout << ch << " - " << i << endl;
    return result;
}

int main() {
    char *charA = new char[12], *charB = new char[12];
    memset(charA, 0, 12);
    memset(charB, 0, 12);
    int numA = 0, numB = 0, numC = 0;
    for (int i = 1000; i <= 9999; i++) {
        sprintf(charA, "%X", i);
        sprintf(charB, "%d", i);

        numA = calc(charA);
        numB = calc(charB);

//        cout << charA << " - " << numA << " - " << charB << " - " << numB << endl;

        memset(charA, 0, 12);
        memset(charB, 0, 12);

        if (numA != numB) {
            continue;
        }
        numC = duodecimal(i);
        if (numA != numC) {
            continue;
        }
        cout << i << endl;
    }

    free(charA);
    free(charB);
}