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Title: GitHub - nettee/little-algorithm: 《LeetCode 例题精讲》系列课程的参考代码

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Description: 《LeetCode 例题精讲》系列课程的参考代码. Contribute to nettee/little-algorithm development by creating an account on GitHub.

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https://github.com/nettee/little-algorithm#如何使用本仓库
https://nettee.io/courses/algorithmhttps://nettee.io/courses/algorithm
https://github.com/nettee/little-algorithm#文章索引
01 反转链表：如何轻松重构链表https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167030&idx=1&sn=c61cb5f0fb8d82aeda29e67050e6815c&chksm=88aa2230bfddab26c47d2204bc7a39fe3c994f998cb29cbaf7b9e33ab30f3988f4c3fd1b21ec&token=1450614154&lang=zh_CN&scene=21#wechat_redirect
02 Path Sum：二叉树的子问题划分https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167032&idx=1&sn=5734e539c8b037faf649df21dce4578d&chksm=88aa223ebfddab28c17163d0f80d4f966a6cff87277bca354e3c5e7aac25486386aa77c1dd0d&token=1450614154&lang=zh_CN&scene=21#wechat_redirect
03 从二叉树遍历到回溯算法https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167045&idx=1&sn=55577c31fd264a13511b4c0f27b3acce&chksm=88aa22c3bfddabd58c470f2933d6272c37f2d6d7a25ddda93f7203a25bf8bc8be4a15e8b9eb4&token=1450614154&lang=zh_CN&scene=21#wechat_redirect
04 用双指针解 Two Sum：缩减搜索空间https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167047&idx=1&sn=21eb442c1a8fe2da9f2a551feffccfb9&chksm=88aa22c1bfddabd729ec6035ef91ca119ec56cbed4727b4c7daec8bda34e918feaf12718b630&token=1450614154&lang=zh_CN&scene=21#wechat_redirect
习题篇：LeetCode 11. 盛最多水的容器https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167054&idx=1&sn=2c721a0e9db857253c2b1b7819474062&chksm=88aa22c8bfddabdec3a6de37631ed493598581fff838c4b89c149f1d6a98c7620b8aedec2325&token=1450614154&lang=zh_CN&scene=21#wechat_redirect
05 双指针×链表问题：快慢指针https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167055&idx=1&sn=0eae5debd1c012c16d939982e7dc48aa&chksm=88aa22c9bfddabdf4fb584057b563f4c26c62d177701c0255816b657f9adfa5ea8bf1c726be8&token=1450614154&lang=zh_CN&scene=21#wechat_redirect
习题篇：LeetCode 148. 链表排序https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167067&idx=1&sn=fd4410901bce41866c1a8c250e708b52&chksm=88aa22ddbfddabcb4ae2552e69068cf9e072b31f8b2d4f1826fc17383cec0db873f52f06bd2f&token=1450614154&lang=zh_CN&scene=21#wechat_redirect
06 旋转数组问题：基本操作的威力https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167071&idx=1&sn=1edf00d74d13edecc39f7f0f8fe8963c&chksm=88aa22d9bfddabcfd49b2a9322998e42ee711966798469b422b9a106abbe5af9d5b1c32b1cfe&token=1450614154&lang=zh_CN&scene=21#wechat_redirect
07 变位词问题：基本数据结构的威力https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167075&idx=1&sn=d71160ef6c4d7c0b9bcbd1b562301a47&chksm=88aa22e5bfddabf39ca9fd439c80b2c8efdd9339f399f0c17c059f1d8012b966ce04bcf1ffe3&token=1450614154&lang=zh_CN&scene=21#wechat_redirect
08 排列组合问题：回溯法的候选集合https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167091&idx=1&sn=82ed3bfa68f92b2826247a0bba40d8ff&chksm=88aa22f5bfddabe322bf5dafeef4f7cd56897d2d7e5b91d55e2baa2b21056694cae7da10c2b5&token=1040542623&lang=zh_CN&scene=21#wechat_redirect
09 排列组合问题再探：回溯法的去重策略https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167095&idx=1&sn=31f6a9115db99f142a4077ba6af308c8&chksm=88aa22f1bfddabe7e0e2d89cdf6d56ea8009388498b64b64eca64629cff29acc5925cbd41b68&token=1149226631&lang=zh_CN&scene=21#wechat_redirect
习题篇：LeetCode 39/40/216. Combination Sum 系列问题https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167117&idx=1&sn=1b3c4f1a2bd2c5463d1bcbdb4579a344&chksm=88aa228bbfddab9d7dfb34c65494df476a5c50530292726640ffca6a71d7d644d2ddf000baa8&token=2122086593&lang=zh_CN&scene=21#wechat_redirect
10 二叉树直径：二叉树遍历中的全局变量https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167144&idx=1&sn=93a4dfaa42aa1bf78d121e224efb7adb&chksm=88aa22aebfddabb8ec6312c96e9178a96a80558ed1eaea89906c3e7c49899cde4b62fdeca7bf&token=621102215&lang=zh_CN&scene=21#wechat_redirect
习题篇：二叉树问题太复杂？「三步走」方法解决它！https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167191&idx=1&sn=6d8ce02aaf7376f94eee022ac2324568&chksm=88aa2351bfddaa470552469d23d6cb2da4191a242cee66a36b143a2722021ac3566abb60ac09&token=590581605&lang=zh_CN&scene=21#wechat_redirect
11 二叉树转化为链表：二叉树遍历中的相邻结点https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167195&idx=1&sn=ae27bd4eaf1d0d4c842436a12ae4fdc0&chksm=88aa235dbfddaa4bdbf996918a15cab0c77d7d2ae8faff766b5d3c4b2cdd0efdd5172f858c79&token=416147250&lang=zh_CN&scene=21#wechat_redirect
12 岛屿问题：网格结构中的 DFShttps://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167208&idx=1&sn=d8118c7c0e0f57ea2bdd8aa4d6ac7ab7&chksm=88aa236ebfddaa78a6183cf6dcf88f82c5ff5efb7f5c55d6844d9104b307862869eb9032bd1f&token=767791540&lang=zh_CN&scene=21#wechat_redirect
13 BFS 的使用场景：层序遍历、最短路径问题https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167212&idx=1&sn=6af5ffe5b69075b21bb4743ddcee4e7c&chksm=88aa236abfddaa7cae70b42edb299d0a52d9f1cc4fc1fdba1116972fc0ca0275b8bfdf10851b&token=245926778&lang=zh_CN&scene=21#wechat_redirect
14 打家劫舍问题：动态规划的解题四步骤https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167219&idx=1&sn=a168412bc5b0c6038e11924baeff7ac8&chksm=88aa2375bfddaa63a69c08c38239dc42519af799e53fbc8eac1202847abb0f2260d6f9055826&token=765982963&lang=zh_CN&scene=21#wechat_redirect
15 最长公共子序列：二维动态规划的解法https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167227&idx=1&sn=f70deaca70ded6a3516ba5e1838d7a69&chksm=88aa237dbfddaa6bd3a43895f78ad37be9bd0d35a1b83214db60f0dad89ced180c47e3ccb4eb&token=738654156&lang=zh_CN&scene=21#wechat_redirect
习题篇：LeetCode 72. 编辑距离https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167315&idx=1&sn=b14570f7b3aff7d6df35faf893b4fec5&chksm=88aa23d5bfddaac30a171550713583f963d4780c77ce3385501b05a25f229dbbfeb4fcf4e764&token=35073347&lang=zh_CN&scene=21#wechat_redirect
16 最大子数组和：子数组类问题的动态规划技巧https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167366&idx=1&sn=5d9cbc8d84d3f338b1ef871bf6703ae1&chksm=88aa2380bfddaa963a8d281256a63a5aa29d758f2e282e70dcad469e8833a93e3968ad53991f&token=440398664&lang=zh_CN&scene=21#wechat_redirect
17 动态规划如何拆分子问题，简化思路https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167418&idx=1&sn=83620b2bb1d53fddf0c1a91ed481c7a4&chksm=88aa23bcbfddaaaa6a239757ebe68b54f31d17fabb2eb061e55ee00b52aec9ea08b5980ca492&token=1440952792&lang=zh_CN&scene=21#wechat_redirect
习题篇：一文教你股票买卖问题实用而装逼的解法https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167490&idx=1&sn=4582545b6f91e1a004f7653d6ce90ed7&chksm=88aa2404bfddad1207c6e991850407ee0aabfeaf877faf0c92a9e1c32bfe839fa55f3cb859d0&token=1440952792&lang=zh_CN&scene=21#wechat_redirect
18 前缀和：空间换时间的技巧https://mp.weixin.qq.com/s?__biz=MzA5ODk3ODA4OQ==&mid=2648167558&idx=1&sn=834d1b24fac173919f5b66f92ec380b9&chksm=88aa24c0bfddadd6952b885b3104abd05b593a9e128d759fe33e24dec0923441ae103c611677&token=1440952792&lang=zh_CN&scene=21#wechat_redirect
https://github.com/nettee/little-algorithm#参考代码
11https://leetcode-cn.com/problems/container-with-most-water
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0011/1.java
LeetCode 11. 盛最多水的容器https://mp.weixin.qq.com/s/RfTyqnIpLwJpRtzPWVZvHA
19https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0019/1.java
LeetCode 例题精讲 | 05 双指针×链表问题：快慢指针https://mp.weixin.qq.com/s/2CLloKhD8tbId1-9uOsNzw
39https://leetcode-cn.com/problems/combination-sum
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0039/1.java
一套代码解决 Combination Sum 系列问题（LeetCode 39/40/216）https://mp.weixin.qq.com/s/uLd8V-YB3Fy3ZNUcQHo8jw
40https://leetcode-cn.com/problems/combination-sum-ii
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0040/1.java
一套代码解决 Combination Sum 系列问题（LeetCode 39/40/216）https://mp.weixin.qq.com/s/uLd8V-YB3Fy3ZNUcQHo8jw
46https://leetcode-cn.com/problems/permutations
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0046/1.java
LeetCode 例题精讲 | 08 排列组合问题：回溯法的候选集合https://mp.weixin.qq.com/s/b6og5Ro4vx-3--qPpi22Mw
47https://leetcode-cn.com/problems/permutations-ii
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0047/1.java
LeetCode 例题精讲 | 09 排列组合问题再探：回溯法的去重策略https://mp.weixin.qq.com/s/h-dzViBTVWmkReA-dbufXA
53https://leetcode-cn.com/problems/maximum-subarray
1https://github.com/nettee/little-algorithm/blob/master/solutions/0053/5.java
2https://github.com/nettee/little-algorithm/blob/master/solutions/0053/4.java
3https://github.com/nettee/little-algorithm/blob/master/solutions/0053/3.java
4https://github.com/nettee/little-algorithm/blob/master/solutions/0053/2.java
5https://github.com/nettee/little-algorithm/blob/master/solutions/0053/1.java
LeetCode 例题精讲 | 16 最大子数组和：子数组类问题的动态规划技巧https://mp.weixin.qq.com/s/e6L2tvWOS_D0obHR_360Gw
72https://leetcode-cn.com/problems/edit-distance
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0072/1.java
经典动态规划：编辑距离https://mp.weixin.qq.com/s/sJZw3ECrgpNItjdzd7g-dA
77https://leetcode-cn.com/problems/combinations
LeetCode 例题精讲 | 08 排列组合问题：回溯法的候选集合https://mp.weixin.qq.com/s/b6og5Ro4vx-3--qPpi22Mw
78https://leetcode-cn.com/problems/subsets
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0078/1.java
LeetCode 例题精讲 | 03 从二叉树遍历到回溯算法https://mp.weixin.qq.com/s/g5uvxi1lyxmWC4LtP0Bdlw
90https://leetcode-cn.com/problems/subsets-ii
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0090/1.java
LeetCode 例题精讲 | 09 排列组合问题再探：回溯法的去重策略https://mp.weixin.qq.com/s/h-dzViBTVWmkReA-dbufXA
98https://leetcode-cn.com/problems/validate-binary-search-tree
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0098/1.java
LeetCode 例题精讲 | 11 二叉树转化为链表：二叉树遍历中的相邻结点https://mp.weixin.qq.com/s/nzQmAOjKMj3ikHXeCUK1zg
102https://leetcode-cn.com/problems/binary-tree-level-order-traversal
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0102/1.java
LeetCode 例题精讲 | 13 BFS 的使用场景：层序遍历、最短路径问题https://mp.weixin.qq.com/s/j6Cjn1DgaMaN1Kwc9mF13Q
110https://leetcode-cn.com/problems/balanced-binary-tree
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0110/1.java
LeetCode 例题精讲 | 10 二叉树直径：二叉树遍历中的全局变量https://mp.weixin.qq.com/s/ZDszP9ashAX6WgtVzhheaQ
112https://leetcode-cn.com/problems/path-sum
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0112/1.java
LeetCode 例题精讲 | 02 Path Sum：二叉树的子问题划分https://mp.weixin.qq.com/s/uSjnfPPXTzScCRQBv6ew1Q
113https://leetcode-cn.com/problems/path-sum-ii
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0113/1.java
LeetCode 例题精讲 | 03 从二叉树遍历到回溯算法https://mp.weixin.qq.com/s/g5uvxi1lyxmWC4LtP0Bdlw
123https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock-iii
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0123/1.java
一文教你股票买卖问题实用而装逼的解法https://mp.weixin.qq.com/s/CWGKl0Ctfc6wStcvBJsD3Q
124https://leetcode-cn.com/problems/binary-tree-maximum-path-sum
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0124/1.java
LeetCode 例题精讲 | 10 二叉树直径：二叉树遍历中的全局变量https://mp.weixin.qq.com/s/ZDszP9ashAX6WgtVzhheaQ
141https://leetcode-cn.com/problems/linked-list-cycle
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0141/1.java
LeetCode 例题精讲 | 05 双指针×链表问题：快慢指针https://mp.weixin.qq.com/s/2CLloKhD8tbId1-9uOsNzw
148https://leetcode-cn.com/problems/sort-list
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0148/1.java
链表综合题 | LeetCode 148. 链表排序https://mp.weixin.qq.com/s/sg2qP5uBEp--bTOYdK_BMw
167https://leetcode-cn.com/problems/two-sum-ii-input-array-is-sorted
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0167/1.java
LeetCode 例题精讲 | 04 用双指针解 Two Sum：缩减搜索空间https://mp.weixin.qq.com/s/Zqy2CAu7L8zw-g1N2v76SQ
189https://leetcode-cn.com/problems/rotate-array
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0189/1.java
LeetCode 例题精讲 | 06 旋转数组问题：基本操作的威力https://mp.weixin.qq.com/s/S-wAKPu8OcI7FyrBkYBzQg
198https://leetcode-cn.com/problems/house-robber
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0198/1.java
LeetCode 例题精讲 | 14 打家劫舍问题：动态规划的解题四步骤https://mp.weixin.qq.com/s/hSAID_hOPGy_DKleq3_DdA
206https://leetcode-cn.com/problems/reverse-linked-list
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0206/1.java
LeetCode 例题精讲 | 01 反转链表：如何轻松重构链表https://mp.weixin.qq.com/s/KTA6Ng1C33fydEn4VDj-7Q
216https://leetcode-cn.com/problems/combination-sum-iii
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0216/1.java
一套代码解决 Combination Sum 系列问题（LeetCode 39/40/216）https://mp.weixin.qq.com/s/uLd8V-YB3Fy3ZNUcQHo8jw
240https://leetcode-cn.com/problems/search-a-2d-matrix-ii
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0240/1.java
LeetCode 例题精讲 | 04 用双指针解 Two Sum：缩减搜索空间https://mp.weixin.qq.com/s/Zqy2CAu7L8zw-g1N2v76SQ
242https://leetcode-cn.com/problems/valid-anagram
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0242/1.java
LeetCode 例题精讲 | 07 变位词问题：基本数据结构的威力https://mp.weixin.qq.com/s/aC8P2Yme35H49GzcoqhzLg
303https://leetcode-cn.com/problems/range-sum-query-immutable
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0303/1.java
LeetCode 例题精讲 | 18 前缀和：空间换时间的技巧https://mp.weixin.qq.com/s/lg4tZUfGcXoKq1jOQtpKJw
322https://leetcode-cn.com/problems/coin-change
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0322/1.java
经典动态规划：「换硬币」系列三道问题详解https://mp.weixin.qq.com/s/pTMsIg9I0z102DQ4HMrYCA
377https://leetcode-cn.com/problems/combination-sum-iv
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0377/1.java
经典动态规划：「换硬币」系列三道问题详解https://mp.weixin.qq.com/s/pTMsIg9I0z102DQ4HMrYCA
426https://leetcode-cn.com/problems/convert-binary-search-tree-to-sorted-doubly-linked-list
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0426/1.java
LeetCode 例题精讲 | 11 二叉树转化为链表：二叉树遍历中的相邻结点https://mp.weixin.qq.com/s/nzQmAOjKMj3ikHXeCUK1zg
463https://leetcode-cn.com/problems/island-perimeter
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0463/1.java
LeetCode 例题精讲 | 12 岛屿问题：网格结构中的 DFShttps://mp.weixin.qq.com/s/1Xi6icqr6JiT8D0jTeamzg
518https://leetcode-cn.com/problems/coin-change-2
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0518/1.java
经典动态规划：「换硬币」系列三道问题详解https://mp.weixin.qq.com/s/pTMsIg9I0z102DQ4HMrYCA
543https://leetcode-cn.com/problems/diameter-of-binary-tree
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0543/1.java
LeetCode 例题精讲 | 10 二叉树直径：二叉树遍历中的全局变量https://mp.weixin.qq.com/s/ZDszP9ashAX6WgtVzhheaQ
560https://leetcode-cn.com/problems/subarray-sum-equals-k
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0560/1.java
LeetCode 例题精讲 | 18 前缀和：空间换时间的技巧https://mp.weixin.qq.com/s/lg4tZUfGcXoKq1jOQtpKJw
563https://leetcode-cn.com/problems/binary-tree-tilt
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0563/1.java
LeetCode 例题精讲 | 10 二叉树直径：二叉树遍历中的全局变量https://mp.weixin.qq.com/s/ZDszP9ashAX6WgtVzhheaQ
695https://leetcode-cn.com/problems/max-area-of-island
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0695/1.java
LeetCode 例题精讲 | 12 岛屿问题：网格结构中的 DFShttps://mp.weixin.qq.com/s/1Xi6icqr6JiT8D0jTeamzg
718https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0718/1.java
LeetCode 例题精讲 | 16 最大子数组和：子数组类问题的动态规划技巧https://mp.weixin.qq.com/s/e6L2tvWOS_D0obHR_360Gw
724https://leetcode-cn.com/problems/find-pivot-index
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0724/1.java
LeetCode 例题精讲 | 18 前缀和：空间换时间的技巧https://mp.weixin.qq.com/s/lg4tZUfGcXoKq1jOQtpKJw
827https://leetcode-cn.com/problems/making-a-large-island
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0827/1.java
LeetCode 例题精讲 | 12 岛屿问题：网格结构中的 DFShttps://mp.weixin.qq.com/s/1Xi6icqr6JiT8D0jTeamzg
876https://leetcode-cn.com/problems/middle-of-the-linked-list
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0876/1.java
LeetCode 例题精讲 | 05 双指针×链表问题：快慢指针https://mp.weixin.qq.com/s/2CLloKhD8tbId1-9uOsNzw
978https://leetcode-cn.com/problems/longest-turbulent-subarray
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/0978/1.java
LeetCode 例题精讲 | 17 动态规划如何拆分子问题，简化思路https://mp.weixin.qq.com/s/TE-p4WYQBBubhxmT137O9w
1143https://leetcode-cn.com/problems/longest-common-subsequence
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/1143/1.java
LeetCode 例题精讲 | 15 最长公共子序列：二维动态规划的解法https://mp.weixin.qq.com/s/dHIeiIQWAeynmYSq9IdqJg
1162https://leetcode-cn.com/problems/as-far-from-land-as-possible
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/1162/1.java
LeetCode 例题精讲 | 13 BFS 的使用场景：层序遍历、最短路径问题https://mp.weixin.qq.com/s/j6Cjn1DgaMaN1Kwc9mF13Q
1372https://leetcode-cn.com/problems/longest-zigzag-path-in-a-binary-tree
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/1372/1.java
二叉树问题太复杂？「三步走」方法解决它！https://mp.weixin.qq.com/s/rweTurnXKD5XY5bH2nqlPQ
1373https://leetcode-cn.com/problems/maximum-sum-bst-in-binary-tree
Javahttps://github.com/nettee/little-algorithm/blob/master/solutions/1373/1.java
二叉树问题太复杂？「三步走」方法解决它！https://mp.weixin.qq.com/s/rweTurnXKD5XY5bH2nqlPQ
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