GitHub高星！互联网公司最常见的面试算法题大集合

新智元报道

来源：Github

编辑：元子

【新智元导读】LeetCode是一个美国的在线编程网站，收集了各个大厂的笔试面试题，对找工作的毕业生和开发者来说，非常有价值。很多求职者都会在LeetCode刷上一遍，面试官也喜欢在上面挑选各类题目。

LeetCode是一个美国的在线编程网站，收集了各个大厂的笔试面试题，对找工作的毕业生和开发者来说，非常有价值。不过LeetCode上面的题目很多都是考察应聘者对基础知识的应用，适合进行练习编程基础或者准备面试。

很多求职者都会在LeetCode刷上一遍，面试官也喜欢在上面挑选各类题目。今天新智元给大家推荐的这个GitHub项目，是Repo主自己刷题的心路历程，并给出了解题参考。该项目目前分为四个部分：

1. 第一个部分是 leetcode 经典题目的解析，包括思路，关键点和具体的代码实现
2. 第二部分是对于数据结构与算法的总结
3. 第三部分是 anki 卡片， 将 leetcode 题目按照一定的方式记录在 anki 中，方便大家记忆
4. 第四部分是计划， 这里会记录将来要加入到以上三个部分内容

只有熟练掌握基础的数据结构与算法，才能对复杂问题迎刃有余。

食用指南

最近添加的部分， 前面会有 ? 标注；最近更新的部分，前面会有 ? 标注；将来会在这里更新anki卡片。

leetcode官方账号在知乎上给出的一个《互联网公司最常见的面试算法题有哪些？》的答案，原文地址：

https://www.zhihu.com/question/24964987/answer/586425979

一张互联网公司面试中经常考察的问题类型总结的思维导图，我们可以结合图片中的信息分析一下。

其中算法，主要是以下几种：

• 基础技巧：分治、二分、贪心
• 排序算法：快速排序、归并排序、计数排序
• 搜索算法：回溯、递归、深度优先遍历，广度优先遍历，二叉搜索树等
• 图论：最短路径、最小生成树
• 动态规划：背包问题、最长子序列

数据结构，主要有如下几种：

• 数组与链表：单 / 双向链表
• 栈与队列
• 哈希表
• 堆：最大堆 ／ 最小堆
• 树与图：最近公共祖先、并查集
• 字符串：前缀树（字典树） ／ 后缀树

精彩预告

42.trapping-rain-water-1(雨水收集问题):

浏览器中的栈：

回溯法解题:

875. koko-eating-bananas:

传送门

leetcode 经典题目的解析

简单难度

? 20. Valid Parentheses：

https://github.com/azl397985856/leetcode/blob/master/problems/20.validParentheses.md

26.remove-duplicates-from-sorted-array：

https://github.com/azl397985856/leetcode/blob/master/problems/26.remove-duplicates-from-sorted-array.md

? 88.merge-sorted-array：

https://github.com/azl397985856/leetcode/blob/master/problems/88.merge-sorted-array.md

136.single-number：

https://github.com/azl397985856/leetcode/blob/master/problems/136.single-number.md

167.two-sum-ii-input-array-is-sorted：

https://github.com/azl397985856/leetcode/blob/master/problems/167.two-sum-ii-input-array-is-sorted.md

? 169.majority-element：

https://github.com/azl397985856/leetcode/blob/master/problems/169.majority-element.md

190.reverse-bits：

https://github.com/azl397985856/leetcode/blob/master/problems/190.reverse-bits.md

191.number-of-1-bits：

https://github.com/azl397985856/leetcode/blob/master/problems/191.number-of-1-bits.md

203.remove-linked-list-elements：

https://github.com/azl397985856/leetcode/blob/master/problems/203.remove-linked-list-elements.md

206.reverse-linked-list：

https://github.com/azl397985856/leetcode/blob/master/problems/206.reverse-linked-list.md

219.contains-duplicate-ii：

https://github.com/azl397985856/leetcode/blob/master/problems/219.contains-duplicate-ii.md

226.invert-binary-tree：

https://github.com/azl397985856/leetcode/blob/master/problems/226.invert-binary-tree.md

283.move-zeroes：

https://github.com/azl397985856/leetcode/blob/master/problems/283.move-zeroes.md

349.intersection-of-two-arrays：

https://github.com/azl397985856/leetcode/blob/master/problems/349.intersection-of-two-arrays.md

中等难度

2. Add Two Numbers：

https://github.com/azl397985856/leetcode/blob/master/problems/2.addTwoNumbers.md

3. Longest Substring Without Repeating Characters：

https://github.com/azl397985856/leetcode/blob/master/problems/3.longestSubstringWithoutRepeatingCharacters.md

11.container-with-most-water：

https://github.com/azl397985856/leetcode/blob/master/problems/11.container-with-most-water.md

19. Remove Nth Node From End of List：

https://github.com/azl397985856/leetcode/blob/master/problems/19.removeNthNodeFromEndofList.md

24. Swap Nodes In Pairs：

https://github.com/azl397985856/leetcode/blob/master/problems/24.swapNodesInPairs.md

? 39.combination-sum：

https://github.com/azl397985856/leetcode/blob/master/problems/39.combination-sum.md

? 40.combination-sum-ii：

https://github.com/azl397985856/leetcode/blob/master/problems/40.combination-sum-ii.md

? 46.permutations：

https://github.com/azl397985856/leetcode/blob/master/problems/46.permutations.md

? 47.permutations-ii：

https://github.com/azl397985856/leetcode/blob/master/problems/47.permutations-ii.md

? 55.jump-game：

https://github.com/azl397985856/leetcode/blob/master/problems/55.jump-game.md

? 62.unique-paths：

https://github.com/azl397985856/leetcode/blob/master/problems/62.unique-paths.md

75.sort-colors：

https://github.com/azl397985856/leetcode/blob/master/problems/75.sort-colors.md

? 78.subsets：

https://github.com/azl397985856/leetcode/blob/master/problems/78.subsets.md

86.partition-list：

https://github.com/azl397985856/leetcode/blob/master/problems/86.partition-list.md

? 90.subsets-ii：

https://github.com/azl397985856/leetcode/blob/master/problems/90.subsets-ii.md

92.reverse-linked-list-ii：

https://github.com/azl397985856/leetcode/blob/master/problems/92.reverse-linked-list-ii.md

94.binary-tree-inorder-traversal：

https://github.com/azl397985856/leetcode/blob/master/problems/94.binary-tree-inorder-traversal.md

102.binary-tree-level-order-traversal：

https://github.com/azl397985856/leetcode/blob/master/problems/102.binary-tree-level-order-traversal.md

103.binary-tree-zigzag-level-order-traversal：

https://github.com/azl397985856/leetcode/blob/master/problems/103.binary-tree-zigzag-level-order-traversal.md

139.word-break：

https://github.com/azl397985856/leetcode/blob/master/problems/139.word-breakmd

144.binary-tree-preorder-traversal：

https://github.com/azl397985856/leetcode/blob/master/problems/144.binary-tree-preorder-traversal.md

? 150.evaluate-reverse-polish-notation：

https://github.com/azl397985856/leetcode/blob/master/problems/150.evaluate-reverse-polish-notation.md

? 152.maximum-product-subarray：

https://github.com/azl397985856/leetcode/blob/master/problems/152.maximum-product-subarray.md

199.binary-tree-right-side-view：

https://github.com/azl397985856/leetcode/blob/master/problems/199.binary-tree-right-side-view.md

201.bitwise-and-of-numbers-range：

https://github.com/azl397985856/leetcode/blob/master/problems/201.bitwise-and-of-numbers-range.md

? 208.implement-trie-prefix-tree：

https://github.com/azl397985856/leetcode/blob/master/problems/208.implement-trie-prefix-tree.md

? 209.minimum-size-subarray-sum：

https://github.com/azl397985856/leetcode/blob/master/problems/209.minimum-size-subarray-sum.md

? 236.lowest-common-ancestor-of-a-binary-tree：

https://github.com/azl397985856/leetcode/blob/master/problems/236.lowest-common-ancestor-of-a-binary-tree.md

? 238.product-of-array-except-self：

https://github.com/azl397985856/leetcode/blob/master/problems/238.product-of-array-except-self.md

240.search-a-2-d-matrix-ii：

https://github.com/azl397985856/leetcode/blob/master/problems/240.search-a-2-d-matrix-ii.md

? 279.perfect-squares：

https://github.com/azl397985856/leetcode/blob/master/problems/279.perfect-squares.md

322.coin-change：

https://github.com/azl397985856/leetcode/blob/master/problems/322.coin-change.md

? 334.increasing-triplet-subsequence：

https://github.com/azl397985856/leetcode/blob/master/problems/334.increasing-triplet-subsequence.md

328.odd-even-linked-list：

https://github.com/azl397985856/leetcode/blob/master/problems/328.odd-even-linked-list.md

416.partition-equal-subset-sum：

https://github.com/azl397985856/leetcode/blob/master/problems/416.partition-equal-subset-sum.md

445.add-two-numbers-ii：

https://github.com/azl397985856/leetcode/blob/master/problems/445.add-two-numbers-ii.md

518.coin-change-2：

https://github.com/azl397985856/leetcode/blob/master/problems/518.coin-change-2.md

875.koko-eating-bananas：

https://github.com/azl397985856/leetcode/blob/master/problems/875.koko-eating-bananas.md

877.stone-game：

https://github.com/azl397985856/leetcode/blob/master/problems/877.stone-game.md

887.super-egg-drop：

https://github.com/azl397985856/leetcode/blob/master/problems/887.super-egg-drop.md

900.rle-iterator：

https://github.com/azl397985856/leetcode/blob/master/problems/900.rle-iterator.md

困难难度

? 23.merge-k-sorted-lists

https://github.com/azl397985856/leetcode/blob/master/problems/23.merge-k-sorted-lists.md

? 42.trapping-rain-water

https://github.com/azl397985856/leetcode/blob/master/problems/42.trapping-rain-water.md

? 128.longest-consecutive-sequence

https://github.com/azl397985856/leetcode/blob/master/problems/128.longest-consecutive-sequence.md

145.binary-tree-postorder-traversal

https://github.com/azl397985856/leetcode/blob/master/problems/145.binary-tree-postorder-traversal.md

146.lru-cache

https://github.com/azl397985856/leetcode/blob/master/problems/146.lru-cache.md

? 239.sliding-window-maximum

https://github.com/azl397985856/leetcode/blob/master/problems/239.sliding-window-maximum.md

? 295.find-median-from-data-stream.md

https://github.com/azl397985856/leetcode/blob/master/problems/295.find-median-from-data-stream.md

301.remove-invalid-parentheses

https://github.com/azl397985856/leetcode/blob/master/problems/301.remove-invalid-parentheses.md

数据结构与算法的总结

? 数据结构：

https://github.com/azl397985856/leetcode/blob/master/thinkings/basic-data-structure.md（草稿）

? 二叉树的遍历：

https://github.com/azl397985856/leetcode/blob/master/thinkings/binary-tree-traversal.md

动态规划：

https://github.com/azl397985856/leetcode/blob/master/thinkings/dynamic-programming.md

哈夫曼编码和游程编码：

https://github.com/azl397985856/leetcode/blob/master/thinkings/run-length-encode-and-huffman-encode.md

布隆过滤器：

https://github.com/azl397985856/leetcode/blob/master/thinkings/bloom-filter.md

anki 卡片

Anki主要分为两个部分:一部分是关键点到题目的映射，另一部分是题目到思路，关键点，代码的映射。

全部卡片都在：

https://github.com/azl397985856/leetcode/blob/master/assets/anki/leetcode.apkg

使用方法

anki - 文件 - 导入 - 下拉格式选择“打包的 anki集合”，然后选中你下载好的文件，确定即可。更多关于anki使用方法的请查看：

https://apps.ankiweb.net/