View Code of Problem 51

#include<stdio.h>
void main(){
int a[10][10];
int n,i,j,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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