View Code of Problem 51

#include<stdio.h>

int main(){
	int i,j,n,sum;
	int x[10][10]={0,0};
	scanf("%d",&n);
    for (i=0;i<n;i++)
		for (j=0;j<n;j++)
			scanf("%d",&x[i][j]);

	for (sum=i=0;i<n;i++)
		for (j=0;j<i+1;j++)
			sum+=x[i][j];
		printf("%d",sum);	

	return 0;
}