题解 | #链表内指定区间反转#

# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = None
class Solution:
    def reverseBetween(self , head: ListNode, m: int, n: int) -> ListNode:
        dummy_head = ListNode(0)
        dummy_head.next = head
        
        # Move prev to the node before the reversal range
        prev = dummy_head
        for _ in range(m - 1):
            prev = prev.next
        
        # Initialize curr to the first node in the reversal range
        curr = prev.next
        
        # Reverse the nodes in the reversal range
        for _ in range(n - m):
            temp = curr.next
            curr.next = temp.next
            temp.next =prev.next
            prev.next = temp
        
        return dummy_head.next