HOJ 1370 Candy

http://acm.hit.edu.cn/hoj/problem/view?id=1370

不能平分就输出-1

N很大 数组开大一点

#include <stdio.h>
#include <math.h>

int block[16384];

double average(int block[], int size);
bool isint(double x);

int main()
{
    int i, n, sum;
    double avg;
    while (scanf("%d", &n) != EOF)
    {
        if (n == -1)
            break;

        sum = 0;
        for (i = 1; i <= n; i++)
            scanf("%d", &block[i]);

        avg = average(block, n);
        if (isint(avg))
        {
            for (i = 1; i <= n; i++)
            {
                if (block[i] > avg)
                    sum += block[i]-avg;
            }
            printf("%d\n", sum);
        }
        else
            printf("-1\n");
    }
}

double average(int block[], int size)
{
    double s = 0;
    int i;

    for (i = 1; i <= size; i++)
        s += block[i];
    return s/size;
}

bool isint(double x)
{
    const double eps = 10e-12;
    double z;

    z = fmod(x, (int)x);
    if (z < eps)
        return 1;
    return 0;
}