题目链接：http://soj.sysu.edu.cn/1014

题目大意

找出所有在10进制、12进制、16进制表示下，各个数位上的数字的和相同的所有四位数。

代码

/**
 * 1014.cpp-Specialized Four-Dig: http://soj.sysu.edu.cn/1014
 * find all 4-digit numbers that the sum of the digits in demical, hexademical
 * and duodemical are all same.
 * Copyright (c) 2014 Junjie Huang@SYSU(SNO:13331087). All Rights Reserved.
 **/
#include<iostream>
using namespace std;

int main() {
  for (int n = 2992; n < 10000; n++) {
    int k, sum1 = 0, sum2 = 0, sum3 = 0;

    k = n;
    while (k) {
      sum1 += k % 10;
      k /= 10;
    }

    k = n;
    while (k) {
      sum2 += k % 12;
      k /= 12;
    }

    k = n;
    while (k) {
      sum3 += k % 16;
      k /= 16;
    }
    if (sum1 == sum2 && sum2 == sum3) cout << n << endl;

  }
  return 0;
}