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27 lines
537 B
JavaScript
27 lines
537 B
JavaScript
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// 递归版
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var reverseList = function(head) {
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const dummy = new ListNode()
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return reverse(head, dummy).next
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};
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function reverse (head, dummy) {
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if (!head) return dummy
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const tmp = head.next
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head.next = dummy.next
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dummy.next = head
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head = tmp
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return reverse(head, dummy)
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}
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// 迭代版
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var reverseList = function(head) {
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const dummy = new ListNode()
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while (head) {
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const tmp = head.next
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head.next = dummy.next
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dummy.next = head
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head = tmp
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}
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return dummy.next
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};
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