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# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def reorderList(self, head: Optional[ListNode]) -> None:
        """
        Do not return anything, modify head in-place instead.
        """
        slow = fast = head
        while fast.next and fast.next.next:
            slow = slow.next
            fast = fast.next.next
 
        prev, curr = None, slow.next
        while curr:
            curr.next, prev, curr = prev, curr, curr.next
        slow.next = None
 
        head1, head2 = head, prev
        while head2:
            head1.next, head1, head2 = head2, head2, head1.next
 

Main.java:1: error: illegal character: '#'
# Definition for singly-linked list.
^
Main.java:1: error: class, interface, or enum expected
# Definition for singly-linked list.
             ^
Main.java:2: error: illegal character: '#'
# class ListNode:
^
Main.java:2: error: '{' expected
# class ListNode:
                ^
Main.java:3: error: illegal character: '#'
#     def __init__(self, val=0, next=None):
^
Main.java:4: error: illegal character: '#'
#         self.val = val
^
Main.java:5: error: illegal character: '#'
#         self.next = next
^
Main.java:6: error: '{' expected
class Solution:
              ^
Main.java:8: error: unclosed string literal
        """
          ^
Main.java:10: error: unclosed string literal
        """
          ^
Main.java:23: error: reached end of file while parsing
            head1.next, head1, head2 = head2, head2, head1.next
                                                               ^
11 errors

Standard output is empty