View Code of Problem 51

#include <stdio.h>

int main(void)
{
    int i,j,arr[11][11],n,sum = 0;
    scanf("%d",&n);
    for(i = 1;i <= n;i++)
    {
        for(j = 1;j <= n;j++)
            scanf("%d",&arr[i][j]);
    }
    for(i = 1;i <= n;i++)
    {
        for(j = 1;j <=i;j++)
            sum += arr[i][j];
    }
    printf("%d\n",sum);
    return 0;

}