View Code of Problem 51

#include<stdio.h>
#include<iostream>
#include<string.h>
using namespace std;

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

    cout<<sum;

    return 0;
}

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