Data Structures and Algorithm Problems Using JavaScript, TypeScript, Go and Java

Data structures and algorithm problems with solution explanations and implementations for different languages

📊 Organized by topic

Math
• Reverse Integer - Easy
• Integer To Roman - Medium
• Maximum Score From Removing Stones - Medium
• Reordered Power Of 2 - Medium
• Permutation Sequence - Hard
• Powx N - Medium
• Minimum Operations To Make Array Equal - Medium
• Broken Calculator - Medium
• Add Binary - Easy
• Nim Game - Easy
• Plus One - Easy
• Palindrome Number - Easy
• Generate Random Point In A Circle - Medium
Stacks
• Largest Rectangle In Histogram - Hard
• Find The Most Competitive Subsequence - Medium
• Flatten Nested List Iterator - Medium
• Maximum Frequency Stack - Hard
• Valid Parentheses - Easy
• Validate Stack Sequences - Medium
• Score Of Parentheses - Medium
• Maximal Rectangle - Hard
Bit Manipulation
• Concatenation Of Consecutive Binary Numbers - Medium
• Number Of Steps To Reduce A Number To Zero - Easy
• Number Of 1 Bits - Medium
• Missing Number - Easy
• Single Number - Easy
• Divide Two Integers - Medium
Arrays
• Create Sorted Array Through Instructions - Hard
• Contains Duplicate - Easy
• Longest Harmonious Subsequence - Easy
• Shortest Unsorted Continuous Subarray - Medium
• Global And Local Inversions - Medium
• Russian Doll Envelopes - Hard
• Longest Consecutive Sequence - Hard
• Can Make Arithmetic Progression From Sequence - Easy
• Kth Missing Positive Number - easy
• Check If All 1s Are At Least Length K Places Away - Easy
• Beautiful Arrangement Ii - Medium
• Remove Elements - Easy
• Best Time To Buy And Sell Stock Ii - Easy
• Distribute Candies - Easy
• Fibonacci Number - Easy
• Search In Rotated Array Ii - Medium
• 3sum - Medium
• Container With Most Water - Medium
• First Missing Positive - Hard
• Best Time To Buy And Sell Stock - Easy
• Merge Intervals - Medium
• Minimum Operations To Reduce X To Zero - Medium
• Insert Interval - Medium
• Set Mismatch - Easy
• Search In Rotated Array - Medium
• Average Waiting Time - Medium
• Sort Colors - Medium
• Substring With Concatenation Of All Words - Hard
• Next Permutation - Medium
• Peeking Iterator - Medium
• 2sum - Easy
• Brick Wall - Medium
• Remove Duplicates From Sorted Array - Easy
• Sum Of Absolute Differences In A Sorted Array - Medium
• Max Number Of K Sum Pairs - Medium
• Merge Sorted Array - Easy
• Kth Largest Element In An Array - Medium
• Shortest Distance To A Character - Easy
• Boats To Save People - Medium
• 3sum With Multiplicity - Medium
• Check If Array Is Sorted And Rotated - Easy
Strings
• Minimum Remove To Make Valid Parentheses - Medium
• Stamping The Sequence - Hard
• Vowel Spellchecker - Medium
• Text Justification - Hard
• Longest Common Prefix - Easy
• Count And Say - Easy
• Multiply Strings - Medium
• Custom Sort String - Medium
• Remove Palindromic Subsequences - Easy
• Check If A String Contains All Binary Codes Of Size K - Medium
• Group Anagrams - Medium
• Valid Number - Hard
• Minimum Window Substring - Hard
• Determine If Two Strings Are Close - Medium
• Wildcard Matching - Hard
• Length Of Last Word - Easy
• Palindromic Substrings - Medium
• Check If Two String Arrays Are Equivalent - Easy
• Longest Word In Dictionary Through Deleting - Medium
• Valid Anagram - Easy
• String To Integer - Medium
• Word Subsets - Medium
• Verifying An Alien Dictionary - Easy
• Determine If String Halves Are Alike - Easy
• Letter Combinations Of A Phone Number - Medium
• Longest Valid Parentheses - Hard
• Reconstruct Original Digits From English - Medium
• Edit Distance - Hard
• Generate Parentheses - Medium
• Roman To Integer - Easy
• StrStr - Easy
• Longest Palindromic Substring - Medium
• Zigzag Conversion - Medium
• Longest Substring Without Repeating Characters - Medium
Breadth First Search
• Average Of Levels In Binary Tree - Easy
• Keys And Rooms - Medium
• Deepest Leaves Sum - Medium
• Is Graph Bipartite - Medium
• Word Ladder - Hard
• Add One Row To Tree - Medium
• Shortest Path In Binary Matrix - Medium
• Pacific Atlantic Water Flow - Medium
Dynamic Programming
• Ones And Zeroes - Medium
• Remove Boxes - Hard
• Cherry Pickup Ii - Hard
• Coin Change - Medium
• Best Time To Buy And Sell Stock With Transaction Fee - Medium
• Get Maximum In Generated Array - Easy
• Binary Trees With Factors - Medium
• Unique Paths Ii - Medium
• Arithmetic Slices - Medium
• Minimum Path Sum - Medium
• Maximal Square - Medium
• Unique Paths - Medium
• Regular Expression Matching - Hard
• Climbing Stairs - Easy
• Trapping Rain Water - Hard
Binary Search
• Find First And Last Position Of Element In Sorted Array - Medium
• Sqrtx - Easy
• Search Insert Position - Easy
• Median Of Two Sorted Arrays - Hard
Matrices
• Sort The Matrix Diagonally - Medium
• Game Of Life - Medium
• Search A 2d Matrix Ii - Medium
• Search A 2d Matrix - Medium
• Set Matrix Zeroes - Medium
• Rotate Image - Medium
• Spiral Matrix - Medium
• Spiral Matrix Ii - Medium
• Valid Sudoku - Medium
Greedy
• Jump Game Ii - Hard
• Jump Game - Medium
• Wiggle Subsequence - Medium
• Advantage Shuffle - Medium
• Smallest String With A Given Numeric Value - Medium
Linked Lists
• Copy List With Random Pointer - Medium
• Palindrome Linked List - Easy
• Partition List - Medium
• Simplify Path - Medium
• Linked List Cycle - Easy
• Add Two Numbers - Medium
• Swapping Nodes In A Linked List - Medium
• Remove Duplicates From Sorted List - Easy
• Reverse Nodes In K Group - Hard
• Merge K Sorted Lists - Hard
• Merge Two Sorted Lists - Easy
• Lru Cache - Medium
• Intersection Of Two Linked Lists - Easy
• Remove Nth Node From End Of List - Medium
Binary Trees
• Binary Tree Right Side View - Medium
• Flip Binary Tree To Match Preorder Traversal - Medium
• Find A Corresponding Node Of A Binary Tree In A Clone Of That Tree - Easy
• Convert Bst To Greater Tree - Medium
• Vertical Order Traversal Of A Binary Tree - Hard
• Trim A Binary Search Tree - Medium
• N Ary Tree Preorder Traversal - Easy
Tries
• Implement Trie Prefix Tree - Medium
• Short Encoding Of Words - Medium
Hashmap
• Design Underground System - Medium
• Encode And Decode Tinyurl - Medium
• Design Hashmap - Easy
Backtracking
• Sudoku Solver - Hard
• Letter Case Permutation - Medium
• Combination Sum - Medium
• N Queens - Hard
• N Queens Ii - Hard
• Combination Sum Ii - Medium
• Permutations Ii - Medium
• Combinations - Medium
• Permutations - Medium
• Subsets - Medium
Heap
• Priority Queue - Medium
• Minimize Deviation In Array - Hard
Dijkstras
• Path With Minimum Effort - Medium

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👤 Author

Saul Maldonado

• 🐱 Github: @saulmaldonado
• 🤝 LinkedIn: @saulmaldonado4
• 🐦 Twitter: @saul_mal
• 💻 Website: saulmaldonado.tech

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