View Code of Problem 51

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

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