View Code of Problem 51

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