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- #include <iostream>
- #include<vector>
- using namespace std;
- int countZeroes(vector<vector<int> > &v){
- int count = 0;
- int i = 0, j = v.size() - 1;
- while(i < (int) v.size() && j >= 0){
- if(v[i][j] == 0){
- count += j + 1;
- i++;
- }
- else{
- j--;
- }
- }
- return count;
- }
- int main()
- {
- int n;
- cin >> n;
- vector<vector<int> > v(n, vector<int>(n));
- for(int i = 0; i < n; i++)
- for(int j = 0; j < n; j++){
- cin >> v[i][j];
- }
- cout << countZeroes(v) << '\n';
- return 0;
- }
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