From cdb78d1667230af61ab09d943d411fdaf2370a35 Mon Sep 17 00:00:00 2001 From: "qingyi.liu" Date: Fri, 21 May 2021 13:25:25 +0800 Subject: [PATCH 1/4] =?UTF-8?q?=E6=B7=BB=E5=8A=A0707.=E8=AE=BE=E8=AE=A1?= =?UTF-8?q?=E9=93=BE=E8=A1=A8JavaScript=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0707.设计链表.md | 136 ++++++++++++++++++++++++++++++++++ 1 file changed, 136 insertions(+) diff --git a/problems/0707.设计链表.md b/problems/0707.设计链表.md index 86cf623b..a4f4d8d3 100644 --- a/problems/0707.设计链表.md +++ b/problems/0707.设计链表.md @@ -393,6 +393,142 @@ class MyLinkedList: Go： +javaScript: + +```js + +class LinkNode { + constructor(val, next) { + this.val = val; + this.next = next; + } +} + +/** + * Initialize your data structure here. + * 单链表 储存头尾节点 和 节点数量 + */ +var MyLinkedList = function() { + this._size = 0; + this._tail = null; + this._head = null; +}; + +/** + * Get the value of the index-th node in the linked list. If the index is invalid, return -1. + * @param {number} index + * @return {number} + */ +MyLinkedList.prototype.getNode = function(index) { + if(index < 0 || index >= this._size) return null; + // 创建虚拟头节点 + let cur = new LinkNode(0, this._head); + // 0 -> head + while(index-- >= 0) { + cur = cur.next; + } + return cur; +}; +MyLinkedList.prototype.get = function(index) { + if(index < 0 || index >= this._size) return -1; + // 获取当前节点 + return this.getNode(index).val; +}; + +/** + * Add a node of value val before the first element of the linked list. After the insertion, the new node will be the first node of the linked list. + * @param {number} val + * @return {void} + */ +MyLinkedList.prototype.addAtHead = function(val) { + const node = new LinkNode(val, this._head); + this._head = node; + this._size++; + if(!this._tail) { + this._tail = node; + } +}; + +/** + * Append a node of value val to the last element of the linked list. + * @param {number} val + * @return {void} + */ +MyLinkedList.prototype.addAtTail = function(val) { + const node = new LinkNode(val, null); + this._size++; + if(this._tail) { + this._tail.next = node; + this._tail = node; + return; + } + this._tail = node; + this._head = node; +}; + +/** + * Add a node of value val before the index-th node in the linked list. If index equals to the length of linked list, the node will be appended to the end of linked list. If index is greater than the length, the node will not be inserted. + * @param {number} index + * @param {number} val + * @return {void} + */ +MyLinkedList.prototype.addAtIndex = function(index, val) { + if(index > this._size) return; + if(index <= 0) { + this.addAtHead(val); + return; + } + if(index === this._size) { + this.addAtTail(val); + return; + } + // 获取目标节点的上一个的节点 + const node = this.getNode(index - 1); + node.next = new LinkNode(val, node.next); + this._size++; +}; + +/** + * Delete the index-th node in the linked list, if the index is valid. + * @param {number} index + * @return {void} + */ +MyLinkedList.prototype.deleteAtIndex = function(index) { + if(index < 0 || index >= this._size) return; + if(index === 0) { + this._head = this._head.next; + this._size--; + return; + } + // 获取目标节点的上一个的节点 + const node = this.getNode(index - 1); + node.next = node.next.next; + // 处理尾节点 + if(index === this._size - 1) { + this._tail = node; + } + this._size--; +}; + +// MyLinkedList.prototype.out = function() { +// let cur = this._head; +// const res = []; +// while(cur) { +// res.push(cur.val); +// cur = cur.next; +// } +// }; +/** + * Your MyLinkedList object will be instantiated and called as such: + * var obj = new MyLinkedList() + * var param_1 = obj.get(index) + * obj.addAtHead(val) + * obj.addAtTail(val) + * obj.addAtIndex(index,val) + * obj.deleteAtIndex(index) + */ +``` + From 05bd25d17cea6219420a26f3f78715ee0ee9bb3a Mon Sep 17 00:00:00 2001 From: "qingyi.liu" Date: Fri, 21 May 2021 13:26:53 +0800 Subject: [PATCH 2/4] =?UTF-8?q?=E6=B7=BB=E5=8A=A0203.=E7=A7=BB=E9=99=A4?= =?UTF-8?q?=E9=93=BE=E8=A1=A8=E5=85=83=E7=B4=A0JavaScript=E7=89=88?= =?UTF-8?q?=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0203.移除链表元素.md | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/problems/0203.移除链表元素.md b/problems/0203.移除链表元素.md index 9fca1ee0..e268c9ac 100644 --- a/problems/0203.移除链表元素.md +++ b/problems/0203.移除链表元素.md @@ -201,6 +201,28 @@ Python： Go： +javaScript: + +```js +/** + * @param {ListNode} head + * @param {number} val + * @return {ListNode} + */ +var removeElements = function(head, val) { + const ret = new ListNode(0, head); + let cur = ret; + while(cur.next) { + if(cur.next.val === val) { + cur.next = cur.next.next; + continue; + } + cur = cur.next; + } + return ret.next; +}; +``` + From 202e201919a1cf3d57821a0dce7d471152888fb0 Mon Sep 17 00:00:00 2001 From: "qingyi.liu" Date: Fri, 21 May 2021 14:05:46 +0800 Subject: [PATCH 3/4] =?UTF-8?q?=E6=B7=BB=E5=8A=A0206.=E5=8F=8D=E8=BD=AC?= =?UTF-8?q?=E9=93=BE=E8=A1=A8javaScript=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/0206.翻转链表.md | 55 +++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/problems/0206.翻转链表.md b/problems/0206.翻转链表.md index 886bbfcd..a6b3ca56 100644 --- a/problems/0206.翻转链表.md +++ b/problems/0206.翻转链表.md @@ -147,6 +147,61 @@ Python： Go： +javaScript: + +```js +/** + * @param {ListNode} head + * @return {ListNode} + */ + +// 双指针： +var reverseList = function(head) { + if(!head || !head.next) return head; + let temp = null, pre = null, cur = head; + while(cur) { + temp = cur.next; + cur.next = pre; + pre = cur; + cur = temp; + } + // temp = cur = null; + return pre; +}; + +// 递归： +var reverse = function(pre, head) { + if(!head) return pre; + const temp = head.next; + head.next = pre; + pre = head + return reverse(pre, temp); +} + +var reverseList = function(head) { + return reverse(null, head); +}; + +// 递归2 +var reverse = function(head) { + if(!head || !head.next) return head; + // 从后往前翻 + const pre = reverse(head.next); + head.next = pre.next; + pre.next = head; + return head; +} + +var reverseList = function(head) { + let cur = head; + while(cur && cur.next) { + cur = cur.next; + } + reverse(head); + return cur; +}; +``` + From 2aed976e4653c5ba42bdedf420fc57cb6a0a5c1f Mon Sep 17 00:00:00 2001 From: "qingyi.liu" Date: Fri, 21 May 2021 14:25:55 +0800 Subject: [PATCH 4/4] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E9=9D=A2=E8=AF=95?= =?UTF-8?q?=E9=A2=98=2002.07.=20=E9=93=BE=E8=A1=A8=E7=9B=B8=E4=BA=A4=20jav?= =?UTF-8?q?aScript=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- problems/面试题02.07.链表相交.md | 36 +++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/problems/面试题02.07.链表相交.md b/problems/面试题02.07.链表相交.md index 493438d7..6bc331b5 100644 --- a/problems/面试题02.07.链表相交.md +++ b/problems/面试题02.07.链表相交.md @@ -155,6 +155,42 @@ Python： Go： +javaScript: + +```js +/** + * @param {ListNode} headA + * @param {ListNode} headB + * @return {ListNode} + */ +var getListLen = function(head) { + let len = 0, cur = head; + while(cur) { + len++; + cur = cur.next; + } + return len; +} +var getIntersectionNode = function(headA, headB) { + let curA = headA,curB = headB, + lenA = getListLen(headA), + lenB = getListLen(headB); + if(lenA < lenB) { + [curA, curB] = [curB, curA]; + [lenA, lenB] = [lenB, lenA]; + } + let i = lenA - lenB; + while(i-- > 0) { + curA = curA.next + } + while(curA && curA !== curB) { + curA = curA.next; + curB = curB.next; + } + return curA; +}; +``` +