View Code of Problem 51

#include<stdio.h>
int main()
{
	int n, i, j, data[20][20],sum=0;
	scanf("%d", &n);
	for(i=0; i<n; ++i){
		for(j=0; j<n; ++j){
			scanf("%d", &data[i][j]);
		} 
	}
	for(i=0; i<n; ++i){
		for(j=0; j<=i; ++j){
			sum += data[i][j];
		} 
	}
	printf("%d", sum);
	return 0;
 } 

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