41 lines
943 B
Python
41 lines
943 B
Python
#!/usr/bin/env python3
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# @author 轩辕龙儿
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# @date 2022/3/1
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# @file reverseBetween.py
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# class ListNode:
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# def __init__(self, x):
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# self.val = x
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# self.next = None
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#
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# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
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#
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#
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# @param head ListNode类
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# @param m int整型
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# @param n int整型
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# @return ListNode类
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#
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from common import ListNode
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class Solution:
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def reverseBetween(self, head: ListNode, m: int, n: int) -> ListNode:
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if m == n:
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return head
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pre = ListNode
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cur = head
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pre.next = cur
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for i in range(m - 1):
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pre = pre.next
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cur = cur.next
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for i in range(n - m):
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nxt = cur.next
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cur.next = nxt.next
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nxt.next = pre.next
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pre.next = nxt
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if m == 1:
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return pre.next
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else:
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return head
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