poj 2196 Specialized Four

#include <cstdio>int sum(int a, int b){    int ret = 0;    while (a)    {        ret += a % b;        a /= b;    }    return ret;}int main(){    for (int i = 2992; i <= 9999; i++)        if (sum(i, 10) == sum(i, 12) && sum(i, 10) == sum(i, 16)) printf("%dn", i);    return 0;}