View Code of Problem 51

#include <stdio.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=sum+a[i][j];
    }
  }
  printf("%d",sum);
}

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