c语言简单运用简单运用

Question

如何解决答二的运行超时问题，急
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Answer 1

供参考：

#include <stdio.h>
int isperfect(int n)
{
    int i, s;
    if (n < 6) return 0;
    for (i = 2, s = 1; i <= n / 2; i++)
        if (n % i == 0)   s += i;
    return s == n;
}

int main()
{
    int N, i, n;
    while (1)
    {
        if (scanf("%d", &N) != 1)  break; //ctrl + z 结束输入
        printf("%d:", N);
        for (i = 1, n = 0; i <= N; i++)
            if (isperfect(i))
                printf(n++ == 0 ? "%d" : " %d", i);
        if (!n)
            printf("NULL");
        printf("\n");
    }
    return 0;
}