View Code of Problem 51

#include<stdio.h>
#include<string.h>

int main()
{
    int n;
    int i,j;
    int sum = 0;

    scanf("%d",&n);

    int a[n][n];

    for(i = 0;i < n;i++)
    {
        for(j =0;j < n;j++)
        {
            scanf("%d",&a[i][j]);
        }
    }
    for(i = 0;i < n;i++)
    {
        for(j = 0;j <= i;j++)
        {
            sum += a[i][j];
        }
    }

    printf("%d\n",sum);
    return 0;
}