View Code of Problem 51

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