View Code of Problem 51

#include <stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    int a[n][n];
    int sum=0;
    for(int i=0;i<n;++i)
    {
        for(int j=0;j<n;++j)
        {
            scanf("%d",&a[i][j]);
            if(i>=j)
                sum+=a[i][j];
        }
    }
    printf("%d",sum);
}

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