View Code of Problem 51

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

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