题解 | #记负均正#

#include <stdio.h>
#include <string.h>

int main(){

    int n;
    scanf("%d", &n);
    int arr[n];
    for(int i = 0; i < n; i++){
        scanf("%d ", &arr[i]);
    }

    int sun = 0;
    int count = 0;
    for(int i = n - 1; i >= 0; i--){
        if(arr[i] == 0)
            n--;
        else if(arr[i] < 0)
            count++;
        else
            sun += arr[i];
    }

    float ave = 0;
    int dnm = n - count;
    if(dnm != 0){
    //    ave = sun / dnm;
        printf("%d %.1f", count, (float)sun / dnm);
    }
    else {
        printf("%d %.1f", count, ave);
    }
    return 0;
}