ex6

#include<iostream>
using namespace std;
int main()
 {
  int n,i,j,a[25][25],k=1;
  cin>>n;
  for(i=1;i<=n;i++)
  {
    if(i%2!=0)
     {
      for(j=1;j<=n;j++)
      {
        a[i][j]=k;
        k++;
     }
     }
    else
      {
       for(j=n;j>=1;j--)
       {
         a[i][j]=k;
         k++;
       }
      }
    }
       for(i=1;i<=n;i++)
      {
       for(j=1;j<=n;j++)
        cout<<a[i][j]<<" ";
        cout<<endl;
      }
   }