I am an Android Developer now, and I used to be an ACMer in university. I always believe that data structure and Algorithm must be mastered and well used as a programmer. In order not to let the data structure and Algorithm fade from my memory, I plan to pick up the Algorithm of LeetCode again. The language is Java, the questions bank will be improved bit by bit, classified by easy, medium and difficult, and sorted by question number for corresponding difficulty. The source code is in the SRC directory, and the relevant solutions are in the Note directory. Welcome to star if you want to learn data structures and algorithms or plan to scan LeetCode.

Now I have the opportunity to have an interview with Facebook. Attached is the number of the interview questions on Facebook in LeetCode. I hope it can help those who want to join Facebook in the future 🙂

1,10,13,15,17,20,23,25,26,28,33,38,43,44,49,50,56,57,67,68,69,71,75,76 78,79,80,85,88,90,91,98,102,117,121,125,127,128,133,139,146,157,158,161 168173200206208209210211215218221234235236238252253257 261265269273274275277278282283285286297301311314325334 341377380398404410461477494523525534535543554Copy the code

For more LeetCode interview questions, see Companies. Md.

Attached is the poem of the town:

Ming has eight imperial examinations, today has LeetCode. Eight sets the format and take literary heart, LeetCode sets the topic and recites the answer. It’s called: “Practice makes perfect.” Neither nor neither, imperial examinations for the country to take scholars, LeetCode for Google screening code workers, each also need.

Easy

# Title Tag
1 Two Sum Array, Hash Table
7 Reverse Integer Math
9 Palindrome Number Math
13 Roman to Integer Math, String
14 Longest Common Prefix String
20 Valid Parentheses Stack, String
21 Merge Two Sorted Lists Linked List
26 Remove Duplicates from Sorted Array Array, Two Pointers
27 Remove Element Array, Two Pointers
28 Implement strStr() Two Pointers, String
35 Search Insert Position String
38 Count and Say String
53 Maximum Subarray Array, Dynamic Programming, Divide and Conquer
58 Length of Last Word String
66 Plus One Array, Math
67 Add Binary Math, String
69 Sqrt(x) Binary Search, Math
70 Climbing Stairs Dynamic Programming
83 Remove Duplicates from Sorted List Linked List
88 Merge Sorted Array Array, Two Pointers
100 Same Tree Tree, Depth-first Search
101 Symmetric Tree Tree, Depth-first Search, Breadth-first Search
104 Maximum Depth of Binary Tree Tree, Depth-first Search
107 Binary Tree Level Order Traversal II Tree, Breadth-first Search
108 Convert Sorted Array to Binary Search Tree Tree, Depth-first Search
110 Balanced Binary Tree Tree, Depth-first Search
111 Minimum Depth of Binary Tree Tree, Depth-first Search, Breadth-first Search
112 Path Sum Tree, Depth-first Search
118 Pascal’s Triangle Array
119 Pascal’s Triangle II Array
121 Best Time to Buy and Sell Stock Array, Dynamic Programmin
122 Best Time to Buy and Sell Stock II Array, Greedy
543 Diameter of Binary Tree Tree

Medium

# Title Tag
2 Add Two Numbers Linked List, Math
3 Longest Substring Without Repeating Characters Hash Table, Two Pointers, String
5 Longest Palindromic Substring String
8 String to Integer (atoi) Math, String
15 3Sum Array, Two Pointers
17 Letter Combinations of a Phone Number String, Backtracking
19 Remove Nth Node From End of List Linked List, Two Pointers
33 Search in Rotated Sorted Array Arrays, Binary Search
43 Multiply Strings Math, String
49 Group Anagrams Hash Table, String
50 Pow(x, n) Math, Binary Search
56 Merge Intervals Array, Sort
554 Brick Wall Hash Table

Hard

# Title Tag
4 Median of Two Sorted Arrays Array, Binary Search, Divide and Conquer
10 Regular Expression Matching String, Dynamic Programming, Backtracking
23 Merge k Sorted Lists Linked List, Divide and Conquer, Heap
25 Reverse Nodes in k-Group Linked List
44 Reverse Nodes in k-Group String, Dynamic Programming, Backtracking, Greedy
57 Insert Interval Array, Sort
68 Text Justification String