View Code of Problem 51

#include<bits/stdc++.h>

using namespace std;

int main(){
    int n,sum=0,a[10][10]={0};
    cin>>n;
    for(int i=0;i<n;i++)
        for(int j=0;j<n;j++)
           cin>>a[i][j];

    for(int i=0;i<n;i++)
        for(int j=0;j<=i;j++)
        sum+=a[i][j];
    cout<<sum;
}

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