Gold Coins

http://poj.org/problem?id=2000

#include<stdio.h>
const int N=;
int main()
{
    int coin[N];
    long long  n,i = ,j,k;
    j = ;
    k = ;
    while (i < )
    {
        if (k < j)
        {
            coin[i++] = j;
            k++;
        }
        if (k >= j)
        {
            k = ;
            j++;
        }

    }
    while(~scanf("%lld",&n)&&n)
    {
        long long scoin = ;
        for (i = ; i <= n; i ++)
            scoin += coin[i];
        printf("%lld %lld\n",n,scoin);
    }
    return ;
}