View Code of Problem 51

#include <stdio.h>
#include<stdlib.h>
#include<math.h>
#include<string.h>

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