View Code of Problem 51

#include <iostream>
#include <cstdio>
using namespace std;
int main(){
    int n;
    cin>>n;
    int i=0,j=0,sum=0;
    int a[15][15];
    for(i=0;i<n;i++){
        for(j=0;j<n;j++){

            cin>>a[i][j];
        }
    }
    for(i=0;i<n;i++){
        j=0;
        for(j=0;j<=i;j++){
            sum+=a[i][j];
            
        }
    }
   cout<<sum;
    return 0;
}

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