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零扣‌‌‍‍‌‍‍‌‍‌‍‍‌‍‍‍‍‌‍‍‌‍‍‍‌‍‍‌‍‍‌‍面试常见题

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Home/Ladder/Algorithm

1 - Defeat the Algorithm Interview

Required(4/4)Optional(3/4)

Easy627. Longest Palindrome

Easy13. Implement strStr()

Medium415. Valid Palindrome

Medium200. Longest Palindromic Substring

2 - Breadth First Search

Required(10/10)Optional(14/14)Related(2/3)

Easy433. Number of Islands

Easy69. Binary Tree Level Order Traversal

Medium615. Course Schedule

Medium616. Course Schedule II

Medium611. Knight Shortest Path

Medium605. Sequence Reconstruction

Medium137. Clone Graph

Medium127. Topological Sorting

Medium7. Serialize and Deserialize Binary Tree

Hard120. Word Ladder

3 - Binary Search

Required(10/10)Optional(11/11)Related(2/8)

Easy458. Last Position of Target

Medium585. Maximum Number in Mountain Sequence

Medium460. Find K Closest Elements

Medium447. Search in a Big Sorted Array

Medium428. Pow(x, n)

Medium159. Find Minimum in Rotated Sorted Array

Medium140. Fast Power

Medium75. Find Peak Element

Medium74. First Bad Version

Medium62. Search in Rotated Sorted Array

4 - Binary Tree - Divide Conquer & Traverse

Required(10/10)Optional(14/14)Related(0/6)

Easy900. Closest Binary Search Tree Value

Easy596. Minimum Subtree

Easy480. Binary Tree Paths

Easy453. Flatten Binary Tree to Linked List

Easy93. Balanced Binary Tree

Medium902. Kth Smallest Element in a BST

Medium578. Lowest Common Ancestor III

Medium95. Validate Binary Search Tree

Hard901. Closest Binary Search Tree Value II

Hard86. Binary Search Tree Iterator

5 - Two Pointers

Required(10/10)Optional(11/11)Related(2/7)

Naive228. Middle of Linked List

Easy607. Two Sum III - Data structure design

Easy539. Move Zeroes

Easy521. Remove Duplicate Numbers in Array

Easy464. Sort Integers II

Medium608. Two Sum II - Input array is sorted

Medium143. Sort Colors II

Medium57. 3Sum

Medium31. Partition Array

Medium5. Kth Largest Element

Easy604. Window Sum

Easy56. Two Sum

Medium1375. Substring With At Least K Distinct Characters

Medium609. Two Sum - Less than or equal to target

Medium587. Two Sum - Unique pairs

Medium533. Two Sum - Closest to target

Medium443. Two Sum - Greater than target

Medium461. Kth Smallest Numbers in Unsorted Array

Medium382. Triangle Count

Medium148. Sort Colors

Medium59. 3Sum Closest

6 - Implicit Graph DFS

Required(10/10)Optional(10/10)Related(0/1)

Medium680. Split String

Medium425. Letter Combinations of a Phone Number

Medium153. Combination Sum II

Medium135. Combination Sum

Medium33. N-Queens

Medium18. Subsets II

Medium17. Subsets

Medium15. Permutations

Hard829. Word Pattern II

Hard121. Word Ladder II

Medium652. Factorization

Medium570. Find the Missing Number II

Medium535. House Robber III

Medium426. Restore IP Addresses

Medium427. Generate Parentheses

Medium10. String Permutation II

Medium152. Combinations

Medium16. Permutations II

Hard802. Sudoku Solver

Hard780. Remove Invalid Parentheses

7 - Hash & Heap

Required(10/10)Optional(12/12)Related(5/9)

Easy642. Moving Average from Data Stream

Easy494. Implement Stack by Two Queues

Easy209. First Unique Character in a String

Medium657. Insert Delete GetRandom O(1)

Medium612. K Closest Points

Medium544. Top k Largest Numbers

Medium104. Merge K Sorted Lists

Medium40. Implement Queue by Two Stacks

Medium4. Ugly Number II

Hard134. LRU Cache

Easy495. Implement Stack

Easy128. Hash Function

Medium685. First Unique Number in Data Stream

Medium613. High Five

Medium606. Kth Largest Element II

Medium601. Flatten 2D Vector

Medium545. Top k Largest Numbers II

Medium526. Load Balancer

Medium486. Merge K Sorted Arrays

Medium130. Heapify

Medium129. Rehashing

Medium124. Longest Consecutive Sequence

Easy551. Nested List Weight Sum

Easy494. Implement Stack by Two Queues

Medium575. Decode String

Medium541. Zigzag Iterator II

Medium540. Zigzag Iterator

Medium528. Flatten Nested List Iterator

Medium471. Top K Frequent Words

Medium224. Implement Three Stacks by Single Array

Hard24. LFU Cache

8 - Memoization Search & Dynamic Programming

Required(6/6)Optional(7/7)Related(1/3)

Medium683. Word Break III

Medium109. Triangle

Medium107. Word Break

Hard582. Word Break II

Hard192. Wildcard Matching

Hard154. Regular Expression Matching

Medium476. Stone Game

Medium190. Next Permutation II

Medium198. Permutation Index II

Medium197. Permutation Index

Medium52. Next Permutation

Medium51. Previous Permutation

Hard634. Word Squares

9 - 4 Key Points of DP and Coordinate DP

Required(8/10)Optional(6/6)Related(2/3)

Easy397. Longest Continuous Increasing Subsequence

Easy115. Unique Paths II

Easy114. Unique Paths

Easy11. Climbing Stairs

Easy110. Minimum Path Sum

Medium603. Largest Divisible Subset

Medium611. Knight Shortest Path

Medium76. Longest Increasing Subsequence

Hard602. Russian Doll Envelopes

Hard398. Longest Continuous Increasing Subsequence II

Easy272. Climbing Stairs II

Medium515. Paint House

Medium151. Best Time to Buy and Sell Stock III

Medium117. Jump Game II

Medium116. Jump Game

Hard622. Frog Jum
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