View Code of Problem 51

#include<stdio.h>
int main(){
	int n,i,j,sum=0;
	scanf("%d",&n);
	int A[n+1][n+1];
	for(i=1;i<=n;i++){
		for(j=1;j<=n;j++){
			scanf("%d",&A[i][j]);
			if(j<=i){
				sum+=A[i][j];
			}
		}
	}
	printf("%d",sum);
	return 0;
}