View Code of Problem 51

#include<stdio.h>
void main(){
  int n;
  int a[][],b[][];
  int sum=0;
  scanf("%d",&n);
  for(int j=0;j<n;j++){
    for(int i=0;i<n;i++)
  {
    scanf("%d",&a[j][i]);
  }
  }
 for(int j=0,m=n-1;j<n;j++,m--){
    for(int i=0,l=n-1;i<n;i++,l--)
  {
    b[i][j]=a[m][l];
  }
  }
  for(int i=0;i<n;i++)
  {
    for(int j=1;j<n;j++)
      sum+=b[i][j];
    n--;
  }
  printf("%d",sum);
}
/*
Main.c:2:6: warning: return type of 'main' is not 'int' [-Wmain]
 void main(){
      ^~~~
Main.c: In function 'main':
Main.c:4:7: error: array type has incomplete element type 'int[]'
   int a[][],b[][];
       ^
Main.c:4:7: note: declaration of 'a' as multidimensional array must have bounds for all dimensions except the first
Main.c:4:13: error: array type has incomplete element type 'int[]'
   int a[][],b[][];
             ^
Main.c:4:13: note: declaration of 'b' as multidimensional array must have bounds for all dimensions except the first
Main.c:4:13: warning: unused variable 'b' [-Wunused-variable]
Main.c:4:7: warning: unused variable 'a' [-Wunused-variable]
   int a[][],b[][];
       ^
*/