zero_seq.cpp

#include <iostream>
#include <vector>
using namespace std;


int count_zero_seq(vector <int> seq)  
{ 
    int n = seq.size();
    int count = 0;
    for (int len = 1; len <= n; len++)  
    {     
        
        for (int i = 0; i <= n - len; i++)  
        { 
            int summ = 0;
             
            int j = i + len - 1;             
            for (int k = i; k <= j; k++)  
                summ += seq[k]; 
            if (summ == 0) count ++;
        } 
    } 
    return count;
} 
  
int main()
{
        int n;
        vector<int> seq;
        cin >> n;
        for (int i = 0; i < n; i++)
        {
                int j;
                cin >> j;
                seq.push_back(j);
        }

        cout << count_zero_seq(seq) << endl;
}