View Code of Problem 51

#include<stdio.h>
int main() 
{
	int n,i,j,sum=0;
	scanf("%d",&n);
	int a[15][15];
	for(i=0;i<n;++i){
		for(j=0;j<n;++j){
			scanf("%d",&a[i][j]);
		}
	}
	for(i=0;i<n;++i){
		for(j=0;j<=i;++j){
			sum+=a[i][j];
		}
	}
	printf("%d",sum);
	return 0;
}

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