View Code of Problem 51

#include <stdio.h>
main(){
	int i,j,n,a[10][10],sum =0;
	scanf("%d",&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",sum);
}