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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. class Main{
  5. 	static class Node{
  6. 		int data;
  7. 		Node next;
  8. 		Node(int data){
  9. 			this.data = data;
  10. 		}
  11. 	}
  12. 	static Node buildlist(int[] vals){
  13. 		Node head = null,tail=null;
  14. 		for(int val : vals){
  15. 			Node newNode = new Node(val);
  16. 			if(head == null){
  17. 				head = newNode;
  18. 				tail = newNode;
  19. 			}else{
  20. 				tail.next = newNode;
  21. 				tail = newNode;
  22. 			}
  23. 		}
  24. 		return head;
  25. 	}
  26. 	static Node reverse(Node head){
  27. 		Node curr=head.next; Node prev = null;
  28. 		while(curr!=null){
  29. 			Node next = curr.next;
  30. 			curr.next = prev;
  31. 			prev = curr;
  32. 			curr = next;
  33. 		}
  34. 		return head;
  35. 	}
  36. 	static boolean check(Node head,Node head1){
  37. 		Node curr = head.next,curr1 = head1.next;
  38. 		while(curr.next!=null&&curr1.next!=null){
  39. 			if(curr != curr1) return false;
  40. 			curr = curr.next;
  41. 			curr1 = curr1.next;
  42. 		}
  43. 		return true;
  44. 	}
  45. 	public static void main(String[]args){
  46. 		Scanner cs = new Scanner(System.in);
  47. 		int n = cs.nextInt();
  48. 		int[] arr = new int[n];
  49. 		for(int i=0; i<n; i++){
  50. 			arr[i] = cs.nextInt();
  51. 		}
  52. 		Node head = buildlist(arr);
  53. 		Node head1 = reverse(head);
  54.  
  55. 		System.out.println(check(head,head1)? "yes" : "no");
  56. 	}
  57. }
Success #stdin #stdout 0.12s 56544KB
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yes
https://ideone.com/Gu6nkR
language:
Java (HotSpot 12)
created:
2 hours ago
visibility:
public

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