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- #include <iostream>
- #include <vector>
- using namespace std;
- int main(){
- int32_t lenght;
- int32_t counter =0;
- cin >> lenght;
- vector<vector<int8_t>> array(lenght);
- for(int i =0; i < lenght; i++) {
- array[i].resize(lenght);
- for (int j = 0; j < lenght; ++j) {
- cin >> array[i][j];
- }
- }
- int j = 1;
- for(int i=0;i <lenght-1;i++)
- {
- for(;j<lenght;j++)
- {
- if(array[i][j] == '1')
- {
- counter++;
- }
- }
- j=i+1;
- }
- cout << counter;
- return 0;
- }
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