View Code of Problem 51

#include <stdio.h>
#include<math.h>
#define N 10
int main()
{
    int n,s[N][N],i,j,sum=0;
    scanf("%d",&n);
    for(i=0;i<n;i++)   
        for(j=0;j<n;j++)
            scanf("%d",&s[i][j]);
    for(i=0;i<n;i++)
        for(j=0;j<=i;j++)
            sum+=s[i][j];
    printf("%d",sum );


    return 0;
}