View Code of Problem 51

#include<stdio.h>
void main(){
	int n,i,j,a[9][9];
	int sum=0;
	scanf("%d",&n);
	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=sum+a[i][j];
	printf("%d\n",sum);
}

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