题解 | #完全数计算#

#include <stdio.h>
#include <string.h>
int judgenum(int x) {
    int i, sum = 0;
    for (i = 1; i < x; i++) {
        if (x % i == 0) {
            sum += i;
        }
    }
    if (sum == x)
        return 1;
    else
        return 0;
}
int main() {
    int n;
    scanf("%d", &n);
    int i, count = 0;
    for (i = 1; i <= n; i++) {
        count += judgenum(i);
    }
    printf("%d\n", count);
    return 0;
}