View Code of Problem 51

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

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