View Code of Problem 51

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