View Code of Problem 51

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]) {
	int a[100][100];
	int n,i,j;
	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+=a[i][j];
		}
	}
	
	printf("%d\n",sum);
	
	return 0;
}

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