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138.复制带随机指针的链表.js
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138.复制带随机指针的链表.js
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/*
* @lc app=leetcode.cn id=138 lang=javascript
*
* [138] 复制带随机指针的链表
*/
// @lc code=start
/**
* // Definition for a Node.
* function Node(val, next, random) {
* this.val = val;
* this.next = next;
* this.random = random;
* };
*/
/**
* @param {Node} head
* @return {Node}
*/
var copyRandomList = function (head) {
if (!head) return null;
let temp = head;
let map = new Map();
while (temp) {
let newHead = map.get(temp);
if (!newHead) {
newHead = new Node(temp.val, null, null);
map.set(temp, newHead);
}
if (temp.random) {
let newNode = map.get(temp.random);
if (!newNode) {
newNode = new Node(temp.random.val, null, null);
map.set(temp.random, newNode);
}
newHead.random = newNode;
}
if (temp.next) {
let newNode = map.get(temp.next);
if (!newNode) {
newNode = new Node(temp.next.val, null, null);
map.set(temp.next, newNode);
}
newHead.next = newNode;
}
temp = temp.next;
}
return map.get(head);
}
// @lc code=end