View Code of Problem 51

#include<stdio.h>
int main()
{
  int n,a[100][100],sum=0,i,j;
  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",sum);
  return 0;
}

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