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- #include <iostream>
- #include <vector>
- #include <cstring>
- #include <algorithm>
- #include <map>
- using namespace std;
- int main(){
- int n;
- cin>>n;
- int niza[n];
- for(int i = 0; i < n; i++){
- cin>>niza[i];
- }
- int rez = 0;
- for(int i = 0; i < n; i++){
- for(int j = i; j < n; j++){
- if(niza[j] == 0) {
- rez += (n - j);
- break;
- }
- }
- }
- cout<<rez<<endl;
- return 0;
- }
- /*
- 5
- 4, 2, 0, 1, 3
- **/
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