题解答案

#include<bits/stdc++.h>
using namespace std;
int a[55];
int main() {
    int n;
    cin >> n;
    int count = 0;
    int left = 0;
    for(int i = 1; i <= n; i++) {
        cin >> a[i];
        if(!left && a[i]) left = i;
    }
    int right = 0;
    for(int i = n; i >= 1; i--) {
        if(!right && a[i]) {
            right = i;
            break;
        }
    }
    for(int i = left; i <= right; i++) {
        if(!a[i]){
             count++;
        }
    }
    cout<<count<<endl;
    return 0;
}