Structured practice

AlgoMindset 75

The 75 problems that cover every core interview pattern — solved right here in your browser. Write JavaScript, submit against real test cases, and watch your progress grow. Every submission is tracked; sign in and your solves follow you across devices.

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Array / String

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Merge Strings AlternatelyEasy Greatest Common Divisor of StringsEasy Kids With the Greatest Number of CandiesEasy Can Place FlowersEasy Reverse Vowels of a StringEasy Reverse Words in a StringMedium Product of Array Except SelfMedium Increasing Triplet SubsequenceMedium String CompressionMedium

Two Pointers

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Move ZeroesEasy Is SubsequenceEasy Container With Most WaterMedium Max Number of K-Sum PairsMedium

Sliding Window

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Maximum Average Subarray IEasy Maximum Number of Vowels in a SubstringMedium Max Consecutive Ones IIIMedium Longest Subarray of 1s After Deleting One ElementMedium

Prefix Sum

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Find the Highest AltitudeEasy Find Pivot IndexEasy

Hash Map / Set

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Find the Difference of Two ArraysEasy Unique Number of OccurrencesEasy Determine if Two Strings Are CloseMedium Equal Row and Column PairsMedium

Stack

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Removing Stars From a StringMedium Asteroid CollisionMedium Decode StringMedium

Queue

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Number of Recent CallsEasy Dota2 SenateMedium

Linked List

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Delete the Middle Node of a Linked ListMedium Odd Even Linked ListMedium Reverse Linked ListEasy Maximum Twin Sum of a Linked ListMedium

Binary Tree — DFS

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Maximum Depth of Binary TreeEasy Leaf-Similar TreesEasy Count Good Nodes in Binary TreeMedium Path Sum IIIMedium Longest ZigZag Path in a Binary TreeMedium Lowest Common Ancestor of a Binary TreeMedium

Binary Tree — BFS

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Binary Tree Right Side ViewMedium Maximum Level Sum of a Binary TreeMedium

Binary Search Tree

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Search in a Binary Search TreeEasy Delete Node in a BSTMedium

Graphs — DFS

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Keys and RoomsMedium Number of ProvincesMedium Reorder Routes to Lead to City ZeroMedium Evaluate DivisionMedium

Graphs — BFS

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Nearest Exit from Entrance in MazeMedium Rotting OrangesMedium

Heap / Priority Queue

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Kth Largest Element in an ArrayMedium Smallest Number in Infinite SetMedium Maximum Subsequence ScoreMedium Total Cost to Hire K WorkersMedium

Binary Search

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Guess Number Higher or LowerEasy Successful Pairs of Spells and PotionsMedium Koko Eating BananasMedium Find Peak ElementMedium

Backtracking

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Letter Combinations of a Phone NumberMedium Combination Sum IIIMedium

DP — 1D

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N-th Tribonacci NumberEasy Min Cost Climbing StairsEasy House RobberMedium Domino and Tromino TilingMedium

DP — Multidimensional

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Unique PathsMedium Longest Common SubsequenceMedium Best Time to Buy and Sell Stock with Transaction FeeMedium Edit DistanceMedium

Bit Manipulation

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Counting BitsEasy Single NumberEasy Minimum Flips to Make a OR b Equal to cMedium

Trie

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Implement Trie (Prefix Tree)Medium Search Suggestions SystemMedium

Intervals

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Non-overlapping IntervalsMedium Minimum Number of Arrows to Burst BalloonsMedium

Monotonic Stack

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Daily TemperaturesMedium Online Stock SpanMedium