需要注意的细节就是平均数是有小数点的

#include <stdio.h>


int main() {
    int n, nums[100];
    double average;
    while(scanf("%d", &n) != EOF) {
        average = 0;
        for(int i = 0; i < n; i++) {
            scanf("%d", &nums[i]);
            average += nums[i];
        }
        average /= n;
        for(int i = 0; i < n; i++) {
            if(nums[i] < average) {
                printf("%d ", nums[i]);
            }
        }
        printf("\n");
    }
    
    return 0;
}