Quant365.com
1
Preface
2
Deepdive
2.1
Project: EMSX
2.2
Project: Atlas
2.3
Project: PVM
2.4
Project: Google Ads Release Dashboard
2.5
Challenges
2.6
Amazon BQ
3
Python
3.1
Decorator
3.2
Descriptor
4
Introduction
4.1
Create a 2-D empty square matrix:
4.2
C++ string split
4.3
C++ language tips
4.4
Complexity
4.5
C++ Deadloop Trap
4.6
array boundary check
4.7
nth_element in java
4.8
Java Length and Size
4.9
template used in online contest
4.10
Python
4.11
about this website
5
Bit
5.1
Gray Code
5.2
Reverse Bits
5.3
Number of 1 Bits
5.4
Counting Bits
5.5
Repeated DNA Sequences
5.6
231. Power of Two
5.7
Single Number I
5.8
Single Number II
5.9
Single Number III
5.10
Power of Four
5.11
Subsets/PowerSet (DAG DFS)
5.12
Isolate the leftmost 1 bit
5.13
405. Convert a Number to Hexadecimal
5.14
Floating Point Number
5.15
Floating Point Number
5.16
BIT(Binary Index Tree)
5.17
Bitmap/Bitarray
5.18
N-Queens
5.19
N-Queens II
5.20
Bloomfilter
5.21
Binary Trie
5.22
Maximum XOR of Two Numbers in an Array
5.23
Integer Compression
5.24
Next or Previous Power of 2
5.25
461. Hamming Distance
5.26
477. Total Hamming Distance
5.27
318. Maximum Product of Word Lengths
5.28
201. Bitwise AND of Numbers Range
5.29
389. Find the Difference
5.30
401. Binary Watch
5.31
476. Number Complement
5.32
320. Generalized Abbreviation
5.33
411. Minimum Unique Word Abbreviation
5.34
779. K-th Symbol in Grammar
5.35
Morse Code
5.36
Bit Manipulation Practice
6
Array
6.1
75. Sort Colors
6.2
Sort Colors II - Rainbow Sort
6.3
442. Find All Duplicates in an Array
6.4
280. Wiggle Sort
6.5
324. Wiggle Sort II
6.6
283. Move Zeroes
6.7
Reverse Words in a String
6.8
Reverse Words in a String II
6.9
345. Reverse Vowels of a String
6.10
189. Rotate Array
6.11
798. Smallest Rotation with Highest Score
6.12
Remove Duplicates from Sorted Array
6.13
80. Remove Duplicates from Sorted Array II
6.14
Disjoint Set and Union Find
6.15
The Suspects
6.16
Longest Consecutive Sequence
6.17
Number of Islands
6.18
Prefix Tree(Trie)
6.19
Interval Series
6.20
56. Merge Intervals
6.21
57. Insert Interval
6.22
277. Find the Celebrity
6.23
238. Product of Array Except Self
6.24
36. Valid Sudoku
6.25
37. Sudoku Solver
6.26
414. Third Maximum Number
6.27
532. K-diff Pairs in an Array
6.28
451. Sort Characters By Frequency
6.29
88. Merge Sorted Array
6.30
643. Maximum Average Subarray I
6.31
644. Maximum Average Subarray II
6.32
633. Sum of Square Numbers
6.33
628. Maximum Product of Three Numbers
6.34
325. Maximum Size Subarray Sum Equals k
6.35
525. Contiguous Array
6.36
523. Continuous Subarray Sum
6.37
410. Split Array Largest Sum
6.38
27. Remove Element
6.39
219. Contains Duplicate II
6.40
41. First Missing Positive
6.41
370. Range Addition
6.42
598. Range Addition II
6.43
493. Reverse Pairs
6.44
665. Non-decreasing Array
6.45
526. Beautiful Arrangement
6.46
667. Beautiful Arrangement II
6.47
448. Find All Numbers Disappeared in an Array
6.48
565. Array Nesting
6.49
775. Global and Local Inversions
6.50
53. Maximum Subarray
6.51
Subarray Sum Closest
6.52
152. Maximum Product Subarray
6.53
325. Maximum Size Subarray Sum Equals k
6.54
209. Minimum Size Subarray Sum
6.55
228. Summary Ranges
7
String
7.1
C++ string functions
7.2
394. Decode String
7.3
KMP (Knuth Morris Pratt)
7.4
28. Implement strStr()
7.5
459. Repeated Substring Pattern
7.6
205. Isomorphic Strings
7.7
290. Word Pattern
7.8
291. Word Pattern II
7.9
65. Valid Number
7.10
68. Text Justification
7.11
635. Design Log Storage System
7.12
67. Add Binary
7.13
161. One Edit Distance
7.14
71. Simplify Path
7.15
388. Longest Absolute File Path
7.16
482. License Key Formatting
7.17
616. Add Bold Tag in String
7.18
670. Maximum Swap
7.19
165. Compare Version Numbers
7.20
6. ZigZag Conversion
7.21
777. Swap Adjacent in LR String
7.22
415. Add Strings
7.23
43. Multiply Strings
7.24
690. Factorial
7.25
271. Encode and Decode Strings
7.26
293. Flip Game
7.27
294. Flip Game II
7.28
93. Restore IP Addresses
7.29
246. Strobogrammatic Number
7.30
247. Strobogrammatic Number II
7.31
791. Custom Sort String
8
Matrix
8.1
Basics
8.2
562. Longest Line of Consecutive One in Matrix
8.3
498. Diagonal Traverse
8.4
Spiral Matrix
8.5
59. Spiral Matrix II
8.6
Young Tableau
8.7
Matrix traversal and CPU Cache
8.8
Rotate Image/Matrix
8.9
Pascal Triangle
8.10
120. Minimum Path Sum of Triangle
8.11
64. Minimum Path Sum
8.12
Sparse Matrix
8.13
Sparse Matrix Multiplication
8.14
CCS (Compressed Column Storage)
8.15
Search a 2D Matrix I
8.16
Search a 2D Matrix II
8.17
378. Kth Smallest Element in a Sorted Matrix
8.18
668. Kth Smallest Number in Multiplication Table
8.19
79. Word Search
8.20
Word Search II
8.21
Extension topics
8.22
73. Set Matrix Zeroes
8.23
Union-Find(Number of Islands)
8.24
305. Number of Islands II
8.25
422. Valid Word Square
8.26
425. Word Squares
8.27
361. Bomb Enemy
8.28
419. Battleships in a Board
8.29
531. Lonely Pixel I
8.30
533. Lonely Pixel II
8.31
624. Maximum Distance in Arrays
8.32
661. Image Smoother
8.33
542. 01 Matrix
8.34
Longest Increasing Path in a Matrix
8.35
675. Cut Off Trees for Golf Event
8.36
547. Friend Circles
8.37
773. Sliding Puzzle
8.38
778. Swim in Rising Water
8.39
723. Candy Crush
8.40
130. Surrounded Regions
8.41
909. Snakes and Ladders
9
Linked List
9.1
Reverse Linked List
9.2
Partition List
9.3
Palindrome Linked List
9.4
143. Reorder List
9.5
328. Odd Even Linked List
9.6
237. Delete Node in a Linked List
9.7
203. Remove Linked List Elements
9.8
138. Copy List with Random Pointer
9.9
Merge Two Sorted Lists
9.10
Merge K Sorted Lists
9.11
141. Linked List Cycle
9.12
142. Linked List Cycle II
9.13
457. Circular Array Loop
9.14
2. Add Two Numbers
9.15
445. Add Two Numbers II
9.16
306. Additive Number
9.17
Intersection of 2 Linked Lists
9.18
19. Remove Nth Node From End of List
9.19
83. Remove Duplicates from Sorted List
9.20
82. Remove Duplicates from Sorted List II
9.21
147. Insertion Sort List
9.22
92. Reverse Linked List II
9.23
382. Linked List Random Node
9.24
61. Rotate List
9.25
82. Remove Duplicates from Sorted List II
10
Set and Map
10.1
220. Contains Duplicate III
10.2
315. Count of Smaller Numbers After Self
10.3
166. Fraction to Recurring Decimal
10.4
781. Rabbits in Forest
10.5
249. Group Shifted Strings
11
Skip List
12
Stack and Queue
12.1
Remove duplicates from string and keep lexicographical order
12.2
636. Exclusive Time of Functions
12.3
640. Solve the Equation
12.4
638. Shopping Offers
12.5
84. Largest Rectangle in Histogram
12.6
218. The Skyline Problem
12.7
224. Basic Calculator
12.8
227. Basic Calculator II
12.9
32. Longest Valid Parentheses
13
Heap
13.1
Basics
13.2
difference between segment-tree
13.3
Index Heap
13.4
D-ary Heap
13.5
Binomial Heap
13.6
Leftish Tree
13.7
Young Tableau
13.8
Applications
13.9
347. Top K Frequent Elements
13.10
499. Word Count (Map Reduce)
13.11
Lossy Counting
13.12
xxx_heap in STL
13.13
630. Course Schedule III
13.14
K-Way Merging
13.15
774. Minimize Max Distance to Gas Station
13.16
169. Majority Element
13.17
229. Majority Element II
13.18
295. Find Median from Data Stream
14
Binary Tree
14.1
Basics of Tree Depth, Height and Level
14.2
222. Count Complete Tree Nodes
14.3
606. Construct String from Binary Tree
14.4
22. Generate Parentheses
14.5
Graph Valid Tree
14.6
Number Tree - LeetCode 386. Lexicographical Numbers
14.7
440. K-th Smallest in Lexicographical Order
14.8
111. Minimum Depth of Binary Tree
14.9
104. Maximum Depth of Binary Tree
14.10
366. Find Leaves of Binary Tree
14.11
364. Nested List Weight Sum II
14.12
Binary Tree Upside Down
14.13
Flatten Binary Tree to Linked List
14.14
Symmetric Tree
14.15
Binary Tree Zigzag Level Order Traversal(BFS)
14.16
Balanced Binary Tree (Recursion)
14.17
297. Serialize and Deserialize Binary Tree
15
Binary Tree (Continued)
15.1
96. Unique Binary Search Trees
15.2
95. Unique Binary Search Trees II
15.3
241. Different Ways to Add Parentheses
15.4
449. Serialize and Deserialize BST
15.5
129. Sum Root to Leaf Numbers
15.6
199. Binary Tree Right Side View
15.7
623. Add One Row to Tree
15.8
572. Subtree of Another Tree
15.9
404. Sum of Left Leaves
15.10
298. Binary Tree Longest Consecutive Sequence
15.11
655. Print Binary Tree
15.12
662. Maximum Width of Binary Tree
15.13
663. Equal Tree Partition
15.14
invertTree(Relation between DFS and Recursion)
15.15
100. Same Tree
15.16
112. Path Sum
15.17
Path Sum II(Traverse One Binary Tree)
15.18
Path Sum III
15.19
666. Path Sum IV
15.20
124. Binary Tree Maximum Path Sum
15.21
543. Diameter of Binary Tree
15.22
687. Longest Univalue Path
16
Tree Traversal
16.1
Morris Traversal
16.2
94. Binary Tree Inorder Traversal
16.3
783. Minimum Distance Between BST Nodes
16.4
98. Validate Binary Search Tree
16.5
230. Kth Smallest Element in a BST
16.6
285. Inorder Successor in BST
16.7
270. Closest Binary Search Tree Value
16.8
272. Closest Binary Search Tree Value II
16.9
144. Binary Tree Preorder Traversal
16.10
255. Verify Preorder Sequence in Binary Search Tree
16.11
145. Binary Tree Postorder Traversal
16.12
99. Recover Binary Search Tree
16.13
113. Path Sum II
16.14
173. Binary Search Tree Iterator
16.15
Tree Search
16.16
545. Boundary of Binary Tree
16.17
538. Convert BST to Greater Tree
16.18
536. Construct Binary Tree from String
16.19
508. Most Frequent Subtree Sum
16.20
Convert a Binary Tree to Threaded binary tree
16.21
257. Binary Tree Paths
16.22
314. Binary Tree Vertical Order Traversal
16.23
652. Find Duplicate Subtrees
17
Trie and Suffix Tree
17.1
Trie (Prefix Tree)
17.2
208. Implement Trie (Prefix Tree)
17.3
211. Add and Search Word - Data structure design
17.4
642. Design Search Autocomplete System
17.5
648. Replace Words
17.6
Suffix Tree
18
Other Trees
18.1
AVL Tree
18.2
Interval Tree
18.3
Segement Tree
18.4
Interval Sum
18.5
Interval Sum II
18.6
Interval Minimum Number
18.7
Count of Smaller Number
18.8
Count of Smaller Number before itself
18.9
315. Count of Smaller Numbers After Self
18.10
Binary Index Tree
18.11
307. Range Sum Query - Mutable
18.12
308. Range Sum Query 2D - Mutable
18.13
303. Range Sum Query - Immutable
18.14
Quad-Tree
18.15
R-Tree
18.16
K-d Tree
18.17
Spanning Tree
18.18
671. Second Minimum Node In a Binary Tree
19
Binary Search Tree
19.1
108. Convert Sorted Array to Binary Search Tree
19.2
109. Convert Sorted List to Binary Search Tree
19.3
AVL tree
19.4
Order Statistic Tree
and
Stream Median Tree
19.5
Find Median from Data Stream
19.6
Identical BST
19.7
98. Validate Binary Search Tree
19.8
333. Largest BST Subtree
19.9
250. Count Univalue Subtrees
19.10
99. Recover Binary Search Tree
19.11
669. Trim a Binary Search Tree
19.12
776. Split BST
20
Graph
20.1
Representation of Graph
20.2
Graph Valid Tree
20.3
BFS (Single/Double/Multiple Sources)
20.4
Walls and Gates (MS-BFS)
20.5
127. Word Ladder
20.6
433. Minimum Genetic Mutation
20.7
126. Word Ladder II
20.8
Number of Connected Components in an Undirected Graph
20.9
684. Redundant Connection
20.10
Shortest Path
20.11
Longest Path
20.12
Expression Add Operators (DFS + Pruning)
20.13
Route Tracking
20.14
Kangroo Jump
20.15
Topological Sort
20.16
Course Schedule - Khan BFS(1 set+2 maps)
20.17
Course Schedule II
20.18
332. Reconstruct Itinerary
20.19
Alien Dictionary
20.20
310. Minimum Height Trees
20.21
Conclusion
20.22
399. Evaluate Division
20.23
529. Minesweeper
20.24
317. Shortest Distance from All Buildings
20.25
133. Clone Graph
20.26
785. Is Graph Bipartite?
20.27
Dijkstra Algorithm
20.28
787. Cheapest Flights Within K Stops
20.29
Kruskal (MST): Really Special Subtree
20.30
Prim’s (MST) : Special Subtree
20.31
Reference Book
21
Computational Geometry
21.1
Rectangles Intersection
21.2
223. Rectangle Area
21.3
391. Perfect Rectangle
21.4
356. Line Reflection
21.5
469. Convex Polygon
21.6
Convex Hull with Graham’s Scan
21.7
587. Erect the Fence
21.8
Closest Pair of Points
22
Approximation Algorithm
23
Math & Probability
23.1
Reverse Integer
23.2
313. Super Ugly Number
23.3
326. Power of Three
23.4
Biased Random Generator
23.5
Weighted Random Number Generator
23.6
Probability key from a given map
23.7
Two Sigma - Random weighted string
23.8
537. Complex Number Multiplication
23.9
Coupon collector’s problem
23.10
625. Minimum Factorization
23.11
398. Random Pick Index
23.12
483. Smallest Good Base
23.13
357. Count Numbers with Unique Digits
23.14
172. Factorial Trailing Zeroes
23.15
319. Bulb Switcher
23.16
672. Bulb Switcher II
23.17
LN 48. Majority Number III
23.18
29. Divide Two Integers
23.19
204. Count Primes
23.20
504. Base 7
23.21
660. Remove 9
23.22
780. Reaching Points
23.23
878. Nth Magical Number
24
Augmented Data Structure
24.1
146. LRU Cache
24.2
460. LFU Cache
24.3
432. All O(1) Data Structure
24.4
362. Design Hit Counter
24.5
359. Logger Rate Limiter
24.6
555. Counting Bloom Filter
24.7
556. Standard Bloom Filter
24.8
635. Design Log Storage System
24.9
588. Design In-Memory File System
24.10
Unrolled Linked List
25
Dynamic Programming
25.1
91. Decode Ways
25.2
639. Decode Ways II
25.3
10. Regular Expression Matching
25.4
Unique Binary Search Trees
25.5
139. Word Break I
25.6
140. Word Break II
25.7
Edit Distance (Levenshtein distance)
25.8
97. Interleaving String
25.9
Distinct Subsequences
25.10
Longest Increasing Subsequence(LIS)
25.11
673. Number of Longest Increasing Subsequence
25.12
646. Maximum Length of Pair Chain
25.13
334. Increasing Triplet Subsequence
25.14
312. Burst Balloons
25.15
256. Paint House
25.16
265. Paint House II
25.17
198. House Robber
25.18
213. House Robber II
25.19
337. House Robber III
25.20
Delete and Earn
25.21
Longest Common Subsequence
25.22
174. Dungeon Game
25.23
494. Target Sum
25.24
85. Maximal Rectangle
25.25
221. Maximal Square
25.26
650. 2 Keys Keyboard
25.27
656. Coin Path
25.28
279. Perfect Squares
25.29
664. Strange Printer
25.30
418. Sentence Screen Fitting
25.31
70. Climbing Stairs
26
Greedy
26.1
649. Dota2 Senate
26.2
55. Jump Game
26.3
45. Jump Game II
27
Select Topics
27.1
Subsequence
27.2
200. Number of Islands
27.3
305. Number of Islands II
27.4
The Suspects
27.5
406. Queue Reconstruction by Height
28
Binary Search
28.1
278. First Bad Version
28.2
Basic - Search in Sorted Array
28.3
367. Valid Perfect Square
28.4
33. Search in Rotated Sorted Array
28.5
81. Search in Rotated Sorted Array II
28.6
34. Search for a Range
28.7
35. Search Insert Position
28.8
287. Find the Duplicate Number(hard)
28.9
153. Find Minimum in Rotated Sorted Array
28.10
154. Find Minimum in Rotated Sorted Array II
28.11
162. Find Peak Element
28.12
852. Peak Index in a Mountain Array
28.13
275. H-Index II
28.14
540. Single Element in a Sorted Array
29
Palindrome
29.1
isPalindrome(ispal)
29.2
Valid Palindrome with Space
29.3
680. Valid Palindrome II
29.4
Number of All Palindrome Substrings
29.5
All Palindrome Substrings
29.6
Longest Palindrome Substring (2D DP, Expansion, Manacher)
29.7
730. Count
Different
Palindromic Subsequences
29.8
Number of All Palindromic subsequence
29.9
All Palindrome Subsequences
29.10
516. Longest Palindromic Subsequence
29.11
Longest Common Subsequence 2
29.12
Longest Increasing Subsequence(LIS) 2
29.13
Palindrome Partitioning (2d DP + subsets DFS)
29.14
132. Palindrome Partitioning II(2d DP+ 1d DP)
29.15
Palindrome Pairs
29.16
266. Palindrome Permutation
29.17
Palindrome Permutation II
29.18
Get Palindrome of a String with replacement
29.19
9. Palindrome Number
29.20
214. Shortest Palindrome
29.21
Minimum insertions to form a palindrome
29.22
409. Longest Palindrome
30
Combinatorics
30.1
447. Number of Boomerangs
30.2
77. Combination (DFS)
30.3
17. Letter Combinations of a Phone Number
30.4
Combination Sum I, II, III, IV
30.5
39. Combination Sum I
30.6
40. Combination Sum II
30.7
216. Combination Sum III
30.8
377. Permutation Sum
30.9
Combination Sum IV (Dup-Removing)
30.10
518. Coin Change 2 (combination sum IV)
30.11
322. Coin Change
30.12
Permutation I. II
30.13
Permutation I
30.14
Permutation II
30.15
60. Permutation Sequence
30.16
Subsets/PowerSet (DAG DFS) I
30.17
Subsets/PowerSet (DAG DFS) II
30.18
Subset Sum
30.19
634. Find the Derangement of An Array
30.20
629. K Inverse Pairs Array
30.21
790. Domino and Tromino Tiling
31
Sliding Window
31.1
76. Minimum Window Substring
31.2
159. Longest Substring with At Most Two Distinct Characters
31.3
3. Longest Substring Without Repeating Characters
31.4
438. Find All Anagrams in a String
31.5
239. Sliding Window Maximum
31.6
480. Sliding Window Median
31.7
632. Smallest Range
32
Concurrency
32.1
Concurrent Hashmap
32.2
Sinlge Blocking Queue
32.3
Bounded Blocking Queue
32.4
Design a DelayQueue
32.5
Inplement A Deadlock
32.6
Ticket Algorithm
32.7
Making Water
32.8
When should one use a spinlock instead of mutex?
33
Iterator
33.1
173. Binary Search Tree Iterator
33.2
284. Peeking Iterator
33.3
341. Flatten Nested List Iterator
33.4
281. Zigzag Iterator
33.5
251. Flatten 2D Vector
33.6
604. Design Compressed String Iterator
34
Google 2015
34.1
Binary Search Tree
34.2
Design Garbage Collector in C++
34.3
149. Max Points on a Line
34.4
568. Maximum Vacation Days
35
Google 2016 07
36
Google 2016 09
37
Google 2016 10
37.1
previous permutation
37.2
next permutation
37.3
Trapping Rain Water I/II
37.4
407. Trapping Rain Water II
37.5
KSum
37.6
2sum
37.7
3sum
37.8
3Sum Closest
37.9
259. 3Sum Smaller
37.10
18. 4Sum
37.11
454. 4Sum II
37.12
ksum I
37.13
ksum II
38
Google 2016 11
38.1
Design Candy Crush
38.2
Gas Station II
38.3
Light Strength (Bomb Enemy Extended)
38.4
68. Text Justification
39
Google 2016 12
39.1
Range Overlap
39.2
Delete Tree
39.3
Lonely Pixel
39.4
163. Missing Ranges
39.5
373. Find K Pairs with Smallest Sums
39.6
Ugly Number I/II, Super Ugly Number
40
Google 2017 01
40.1
394. Decode String
40.2
166. Fraction to Recurring Decimal
40.3
345. Reverse Vowels of a String
40.4
411. Minimum Unique Word Abbreviation
41
Google 2017 03
41.1
587. Erect the Fence
41.2
Othello Game
41.3
RLEIterator - run-length encoding
41.4
393. UTF-8 Validation
41.5
Hashmap with TTL
41.6
Max submatrix with four vertices equal to 1
41.7
Find Shortest Non-substring With Give Alphabet
42
Google 2017 05
42.1
Binary Search _last_equal_or_less
42.2
Longest Ridge
42.3
Sort better than nlogn
43
Google 2017 12
44
Facebook 2016 Interview Questions Part 1
44.1
157. Read N Characters Given Read4
44.2
158. Read N Characters Given Read4 II - Call multiple times
44.3
168. Excel Sheet Column Title
44.4
301. Remove Invalid Parentheses
44.5
20. Valid Parentheses
44.6
Longest Path in N-ary Tree
44.7
Longest Path in DAG
44.8
298. Binary Tree Longest Consecutive Sequence
44.9
549. Binary Tree Longest Consecutive Sequence II
44.10
554. Brick Wall
45
Facebook 2017 Interview Questions Part 1
45.1
273. Integer to English Words
45.2
283. Move Zeroes
45.3
Amazing Numbers
45.4
252. Meeting Rooms
45.5
253. Meeting Rooms II
45.6
Gas Station
45.7
Largest Subarray
45.8
621. Task Scheduler
45.9
468. Validate IP Address
46
Facebook 2017 Interview Questions Part 2
46.1
facebok design questions
46.2
Design Memcached
46.3
Design POI
46.4
Length of Longest Arithmetic Progression (LLAP)
46.5
Interview URLs
46.6
383. Ransom Note
46.7
304. Range Sum Query 2D - Immutable
46.8
350. Intersection of Two Arrays II
47
Uber 2016 11
48
Linkedin before 2015
48.1
Sudoku - Add Two Numbers - Maximum product of a triplet
48.2
Bipartite - Product of Array Except Self - Intersection of Two Arrays
48.3
415. Add Strings
48.4
34. Search for a Range
48.5
Design RESTFUL Server
48.6
Deadlock + Constant Time Add-Remove Data Structure
48.7
Line Iterator of Text File
48.8
Bidirection BFS + Design Hashtable
48.9
Convert a Binary Tree into its Mirror Tree
48.10
getTotalCoveredLength
48.11
Count possible triangles + Implement Linked List
48.12
Text Justification
48.13
LCA with parent pointer
48.14
Implement a blocking bounded queue
48.15
Sqrt
48.16
Flatten a multilevel linked list
48.17
Design Thread-Safe Hashmap + Celebrity
48.18
149. Max Points on a Line
48.19
Distributed Inverted Index Design
48.20
isThirdDegree
48.21
13. Roman to Integer
48.22
12. Integer to Roman
48.23
Edit Distance (Levenshtein distance)
48.24
Write-through and Write-back Cache + MM File
48.25
Memory Copy + BST Insert and Delete + Making Water
48.26
Making Water
48.27
Word Ladder 1.5
48.28
3rd Degree Friends and Distributed Graph
48.29
Place Flowers
49
Linkedin 2015
49.1
Longest Palindromic Subsequence
49.2
39. Combination Sum I, II, III, IV
49.3
Identical BST
49.4
All Palindromic subsequence
49.5
Multilevel linked list + Design Filesystem
50
Linkedin 2016 01-06
50.1
Reservoir sampling
50.2
Loop mutlidimentional arrays
51
Linkedin 2016 10
51.1
Design Key Value Store
51.2
Design Monitoring System
51.3
3 Degree Friends
52
Linkedin 2016 11
52.1
384. Shuffle an Array
52.2
235. Lowest Common Ancestor of a Binary Search Tree
52.3
236. Lowest Common Ancestor of a Binary Tree
52.4
254. Factor Combinations
52.5
170. Two Sum III - Data structure design
52.6
187. Repeated DNA Sequences
52.7
339. Nested List Weight Sum
52.8
Shortest Word Distance
Series
52.9
Maximum product of a triplet
52.10
Median/Max/Min Stack
52.11
366. Find Leaves of Binary Tree
52.12
Design Google Calendar
52.13
160. Intersection of Two Linked Lists
52.14
50. Pow(x, n)
52.15
Hangman Game
52.16
K Closest Points(KNN)
52.17
450. Delete Node in a BST
52.18
Lazy caterer’s sequence and Cake number
52.19
78. Subsets I II
52.20
464. Can I Win (if I go first)
52.21
297. Serialize and Deserialize Binary Tree
52.22
449. Serialize and Deserialize BST
52.23
341. Flatten Nested List Iterator
52.24
Isomorphic String
52.25
Paint House + Biased Random Generator + KMeans
52.26
Map Reduce
52.27
Union and Intersection of two Linked Lists
52.28
149. Max Points on a Line
53
Linkedin 2016 12
53.1
149. Max Points on a Line
53.2
number of possible triangles
53.3
282. Expression Add Operators(H)
53.4
Union and Intersection of two Linked Lists
54
Linkedin 2017 Interview Questions Part 1
54.1
39. Combination Sum
54.2
40. Combination Sum II
54.3
Top K URLs in last 24hr/1hr/5min
54.4
Flatten a multilevel linked list 2
54.5
380. Insert Delete GetRandom O(1)
54.6
Tournament Tree
54.7
Float to English Words
54.8
Print Matrix
54.9
Evely Split N numbers into K buckets + Desgin Youtube + Zappos
54.10
Tiny URL
54.11
Hangman
55
Linkedin 2017 Interview Questions Part 2
55.1
151. Reverse Words in a String
55.2
Top 500 exceptions in 1 hour
55.3
MaxStack
55.4
270. Closest Binary Search Tree Value
55.5
Weighted Random
55.6
Coin Change
55.7
RTree/Quad Tree/Kd Tree
55.8
design侦测恶意的封包
56
Linkedin 2017 Interview Questions Part 3
56.1
a==b but ++a != ++b
56.2
Sparse Matrix Storage
57
Airbnb 2016 11
58
Snapchat 2016 11
59
Bloomberg 2015
59.1
TryingAndTrying 发表于 2015-7-28 03:06:00
59.2
anonym 发表于 2015-7-25 09:45:37
59.3
JoeQi 发表于 2015-4-2 08:51:55
59.4
notturno 发表于 2015-7-25 00:08:17
59.5
smith 发表于 2015-1-23 12:31:16
59.6
ethan11015 发表于 2015-7-20 02:27:42
59.7
zijianz 发表于 2015-4-9 11:54:38
59.8
royalheart 发表于 2015-2-28 08:04:57
59.9
catinclay 发表于 2015-3-18 08:08:22
59.10
Xin_walker 发表于 2015-6-11 14:46:45
59.11
121. Best Time to Buy and Sell Stock
59.12
122. Best Time to Buy and Sell Stock II
59.13
445. Add Two Numbers II
60
Bloomberg 2016
60.1
Pow(x, y)
60.2
Reverse Integer
60.3
645. Set Mismatch
60.4
Missing Number in Unsorted Arithmetic Series
60.5
max sum subarray
60.6
histogram query
60.7
print matrix diagnally from southwest to eastnorth
60.8
deadlock
60.9
Histogram Iterator
60.10
Best Time to Buy and Sell Stock (Once)
60.11
Best Time to Buy and Sell Stock (Unlimited Times)
60.12
Best Time to Buy and Sell Stock (At Most Two Transactions)
60.13
Best Time to Buy and Sell Stock (At Most K Transactions)
60.14
Best Time to Buy and Sell Stock with Cooldown
61
Bloomberg 2017
61.1
Blow off leaf nodes of binary tree
61.2
Knight’s tour
61.3
Design booking system
61.4
Flood Fill a Matrix
61.5
295. Find Median from Data Stream
61.6
LFU Cache
61.7
49. Group Anagrams
61.8
Flip zeroes
61.9
Rate Limiter
61.10
61.11
463. Island Perimeter
61.12
Design room reservation system
61.13
Intersection of Linked List
61.14
Marathon Ranking TopK
61.15
Segregate even and odd nodes in a Linked List
61.16
Compress String
61.17
Design Lift System
62
HFT 2016 11
62.1
Monty Hall Problem
62.2
Trader @ Akuna
63
MS Yahoo 2016 11
64
Other Companies
64.1
Count All Palindrome Substrings in a String
64.2
Josephus problem
64.3
390. Elimination Game
64.4
116. Populating Next Right Pointers in Each Node
64.5
117. Populating Next Right Pointers in Each Node II
64.6
387. First Unique Character in a String
64.7
64. Minimum Path Sum
64.8
Drive.AI Merge Two Sorted Array
64.9
Drive.AI Sort Build Dependency
64.10
Multithread Token Bucket + Crawler
64.11
517. Super Washing Machines
64.12
Graph Valid N-ary Tree
64.13
Maximize number of 0s by flipping a subarray
64.14
134. Gas Station
64.15
Design BlackJack
64.16
Merge Sort
64.17
Print Diamond
64.18
N People Tournament
64.19
Fibonacci Number
64.20
QuickSelect
64.21
Unrolled Linked List
64.22
Two Sigma OA
65
Amazon
65.1
How to prepare Amazon Behavior Question?
66
Pure Storage
66.1
OA
66.2
Image Smoother
66.3
task dispatch system
66.4
202. Happy Number
66.5
buddy system bitmap
66.6
Virtual Function and Table
66.7
593. Valid Square
66.8
Draw a Circle
67
Apple
67.1
Compound Iterator
67.2
Implement Natural Numbers
67.3
Implement Natural Numbers 2
67.4
N-Way-List-Merge
67.5
Optimal 2-way Split
67.6
Palindrome Questions
67.7
Primes Sieve
67.8
Resource Pool
67.9
Refactor Rock, Paper, Scissors
67.10
Rolling Window
67.11
Trending URLs
67.12
URL Shortener
68
Indeed
68.1
Unrolled Linked List
68.2
Roll Dice
68.3
Git Commit
68.4
Normalized Title
68.5
Related Words Search
69
Oscar Health
69.1
Morse Codec
70
Company Summary
70.1
Linkedin
70.2
Facebook
References
Quant365
Programming Notes for Software Engineer
Chapter 36
Google 2016 09
