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Software Engineer Interview Handbook
  • README
  • Behavioral
    • Useful Links
    • Dongze Li
  • Algorithm
    • Segment Tree
    • Array
      • Product Of Array Except Self
      • Merge Strings Alternately
      • Increasing Triplet Subsequence
      • String Compression
      • Greatest Common Divisor Strings
      • Max Product Of Three
      • Find Duplicate Num
      • Valid Palindrome Ii
      • Next Permutation
      • Rearrange Array By Sign
      • Removing Min Max Elements
      • Find Original Array From Doubled
      • Reverse Words Ii
    • Backtracking
      • Letter Combination Phone Number
      • Combination Sum Iii
      • N Queens
      • Permutations
      • Combination Sum
    • Binary Search
      • Koko Eating Bananas
      • Find Peak Element
      • Successful Pairs Of Spells Potions
    • Binary Search Tree
      • Delete Node In BST
      • Validate Bst
      • Range Sum Bst
    • Binary Tree
      • Maximum Depth
      • Leaf Similar Trees
      • Maximum Level Sum
      • Binary Tree Right Side
      • Lowest Common Ancestor
      • Longest Zigzag Path
      • Count Good Nodes
      • Path Sum III
      • Maximum Path Sum
      • Move Zero
      • Diameter Binary Tree
      • Sum Root Leaf Number
      • Traversal
      • Binary Tree Vertical Order
      • Height Tree Removal Queries
      • Count Nodes Avg Subtree
      • Distribute Coins
      • Binary Tree Max Path Sum
    • Bit
      • Min Flips
      • Single Number
      • Pow
      • Find Unique Binary Str
    • BFS
      • Rotten Oranges
      • Nearest Exist From Entrance
      • Minimum Knight Moves
      • Network Delay Time
      • Minimum Height Tree
      • Knight Probability In Board
    • Design
      • LRU Cache
      • Get Random
      • LFU Cache
      • Moving Average
      • Rle Iterator
      • Design Hashmap
    • DFS
      • Reorder Routes Lead City
      • Evaluate Division
      • Keys And Rooms
      • Number Of Provinces
      • Disconnected Path With One Flip
      • Course Schedule Ii
      • Robot Room Cleaner
      • Word Break Ii
      • Number Coins In Tree Nodes
      • Maximum Increasing Cells
      • Number Coins In Tree Nodes
      • Detonate Maximum Bombs
      • Find All Possible Recipes
      • Min Fuel Report Capital
      • Similar String Groups
    • DP
      • Domino And Tromino Tiling
      • House Robber
      • Longest Common Subsequence
      • Trade Stock With Transaction Fee
      • Buy And Sell Stock
      • Longest Non Decreasing Subarray
      • Number Of Good Binary Strings
      • Delete And Earn
      • Minimum Costs Using Train Line
      • Decode Ways
      • Trapping Rain Water
      • Count Fertile Pyramids
      • Minimum Time Finish Race
      • Knapsack
      • Count Unique Char Substrs
      • Count All Valid Pickup
    • Greedy
      • Dota2 Senate
      • Smallest Range Ii
      • Can Place Flowers
      • Meeting Rooms II
      • Guess the word
      • Minimum Replacement
      • Longest Palindrome Two Letter Words
      • Parentheses String Valid
      • Largest Palindromic Num
      • Find Missing Observations
      • Most Profit Assigning Work
    • Hashmap
      • Equal Row Column Pairs
      • Two Strings Close
      • Group Anagrams
      • Detect Squares
    • Heap
      • Maximum Subsequence Score
      • Smallest Number Infinite Set
      • Total Cost Hire Workers
      • Kth Largest Element
      • Meeting Rooms III
      • K Closest Points Origin
      • Merge K Sorted List
      • Top K Frequent Elements
      • Meeting Room III
      • Num Flowers Bloom
      • Find Median From Stream
    • Intervals
      • Non Overlapping Intervals
      • Min Arrows Burst Ballons
    • Linkedlist
      • Reverse Linked List
      • Delete Middle Node
      • Odd Even Linkedlist
      • Palindrome Linkedlist
    • Monotonic Stack
      • Daily Temperatures
      • Online Stock Span
    • Random
      • Random Pick With Weight
      • Random Pick Index
      • Shuffle An Array
    • Recursion
      • Difference Between Two Objs
    • Segment Fenwick
      • Longest Increasing Subsequence II
    • Stack
      • Removing Stars From String
      • Asteroid Collision
      • Evaluate Reverse Polish Notation
      • Building With Ocean View
      • Min Remove Parentheses
      • Basic Calculator Ii
      • Simplify Path
      • Min Add Parentheses
    • Prefix Sum
      • Find The Highest Altitude
      • Find Pivot Index
      • Subarray Sum K
      • Range Addition
    • Sliding Window
      • Max Vowels Substring
      • Max Consecutive Ones III
      • Longest Subarray Deleting Element
      • Minimum Window Substring
      • K Radius Subarray Averages
    • String
      • Valid Word Abbreviations
    • Two Pointers
      • Container With Most Water
      • Max Number K Sum Pairs
      • Is Subsequence
      • Num Substrings Contains Three Char
    • Trie
      • Prefix Tree
      • Search Suggestions System
      • Design File System
    • Union Find
      • Accounts Merge
    • Multithreading
      • Basics
      • Web Crawler
  • System Design
    • Operating System
    • Mocks
      • Design ChatGPT
      • Design Web Crawler
      • Distributed Search
      • News Feed Search
      • Top K / Ad Click Aggregation
      • Design Job Scheduler
      • Distributed Message Queue
      • Google Maps
      • Nearby Friends
      • Proximity Service
      • Metrics monitoring and alert system
      • Design Email
      • Design Gaming Leaderboard
      • Facebook New Feed Live Comments
      • Dog Sitting App
      • Design Chat App (WhatsApp)
      • Design Youtube/Netflix
      • Design Google Doc
      • Design Webhook
      • Validate Instacart Shopper Checkout
      • Design Inventory
      • Design donation app
      • Design Twitter
    • Deep-Dive
      • Back of Envelope
      • Message Queue
      • Redis Sorted Set
      • FAQ
      • Geohash
      • Quadtree
      • Redis Pub/Sub
      • Cassandra DB
      • Collaborative Concurrency Control
      • Websocket / Long Polling / SSE
    • DDIA
      • Chapter 2: Data Models and Query Languages
      • Chapter 5: Replication
      • Chapter 9: Consistency and Consensus
  • OOD
    • Overview
    • Design Parking
  • Company Tags
    • Meta
    • Citadel
      • C++ Fundamentals
      • 面经1
      • Fibonacci
      • Pi
      • Probability
    • DoorDash
      • Similar String Groups
      • Door And Gates
      • Max Job Profit
      • Design File System
      • Count All Valid Pickup
      • Most Profit Assigning Work
      • Swap
      • Binary Tree Max Path Sum
      • Nearest Cities
      • Exployee Free Time
      • Tree Add Removal
    • Lyft
      • Autocomplete
      • Job Scheduler
      • Read4
      • Kvstore
    • Amazon
      • Min Binary Str Val
    • AppLovin
      • TODO
      • Java Basic Questions
    • Google
      • Huffman Tree
      • Unique Elements
    • Instacart
      • Meeting Rooms II
      • Pw
      • Pw2
      • Pw3
      • Expression1
      • Expression2
      • Expression3
      • PW All
      • Expression All
      • Wildcard
      • Free forum tech discussion
    • OpenAI
      • Spreadsheet
      • Iterator
      • Kv Store
    • Rabbit
      • Scheduler
      • SchedulerC++
    • [Microsoft]
      • Min Moves Spread Stones
      • Inorder Successor
      • Largest Palindromic Num
      • Count Unique Char Substrs
      • Reverse Words Ii
      • Find Missing Observations
      • Min Fuel Report Capital
      • Design Hashmap
      • Find Original Array From Doubled
      • Num Flowers Bloom
      • Distribute Coins
      • Find Median From Stream
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On this page
  1. Algorithm

Hashmap

  • Equal Row Column Pairs

  • Two Strings Close

  • Group Anagrams

  • Detect Squares

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Last updated 1 year ago