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52 questions tracked45 with solutions

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Frequency scoreSorted highest → lowest frequency✓ Our Solution = we have a detailed walkthrough

Showing 52 of 52 questions

MediumInsert Delete GetRandom O(1)✓ Our Solution

100

ArrayHash TableMathDesign+1

LeetCode ↗55% acc.

MediumFlatten Nested List Iterator✓ Our Solution

StackTreeDepth-First SearchDesign+2

LeetCode ↗65% acc.

HardTrapping Rain Water✓ Our Solution

ArrayTwo PointersDynamic ProgrammingStack+1

LeetCode ↗65% acc.

MediumDesign Twitter✓ Our Solution

Hash TableLinked ListDesignHeap (Priority Queue)

LeetCode ↗43% acc.

MediumTweet Counts Per Frequency✓ Our Solution

Hash TableBinary SearchDesignSorting+1

LeetCode ↗45% acc.

MediumMerge Intervals✓ Our Solution

ArraySorting

LeetCode ↗49% acc.

MediumImplement Trie (Prefix Tree)✓ Our Solution

Hash TableStringDesignTrie

LeetCode ↗68% acc.

HardBest Meeting Point

ArrayMathSortingMatrix

LeetCode ↗61% acc.

MediumLRU Cache✓ Our Solution

Hash TableLinked ListDesignDoubly-Linked List

LeetCode ↗45% acc.

MediumInvestments in 2016✓ Our Solution

Database

LeetCode ↗50% acc.

EasyCustomer Placing the Largest Number of Orders✓ Our Solution

Database

LeetCode ↗64% acc.

MediumMinimum Genetic Mutation✓ Our Solution

Hash TableStringBreadth-First Search

LeetCode ↗55% acc.

MediumMinimum Number of Steps to Make Two Strings Anagram✓ Our Solution

Hash TableStringCounting

LeetCode ↗82% acc.

MediumValidate IP Address✓ Our Solution

String

LeetCode ↗28% acc.

MediumCount Student Number in Departments

Database

LeetCode ↗60% acc.

MediumRectangles Area

Database

LeetCode ↗69% acc.

EasyInvalid Tweets✓ Our Solution

Database

LeetCode ↗86% acc.

MediumTree Node✓ Our Solution

Database

LeetCode ↗74% acc.

MediumNumber of Black Blocks✓ Our Solution

ArrayHash TableEnumeration

LeetCode ↗39% acc.

MediumMasking Personal Information✓ Our Solution

String

LeetCode ↗51% acc.

MediumDesign Authentication Manager✓ Our Solution

Hash TableLinked ListDesignDoubly-Linked List

LeetCode ↗58% acc.

MediumMinimum Elements to Add to Form a Given Sum✓ Our Solution

ArrayGreedy

LeetCode ↗44% acc.

EasyBinary Gap✓ Our Solution

Bit Manipulation

LeetCode ↗65% acc.

MediumFinding the Users Active Minutes✓ Our Solution

ArrayHash Table

LeetCode ↗80% acc.

MediumProcess Tasks Using Servers✓ Our Solution

ArrayHeap (Priority Queue)

LeetCode ↗41% acc.

MediumRemove All Occurrences of a Substring✓ Our Solution

StringStackSimulation

LeetCode ↗78% acc.

MediumCount Sub Islands✓ Our Solution

ArrayDepth-First SearchBreadth-First SearchUnion Find+1

LeetCode ↗73% acc.

HardTrapping Rain Water II✓ Our Solution

ArrayBreadth-First SearchHeap (Priority Queue)Matrix

LeetCode ↗59% acc.

HardRegular Expression Matching✓ Our Solution

StringDynamic ProgrammingRecursion

LeetCode ↗29% acc.

MediumKth Smallest Element in a Sorted Matrix✓ Our Solution

ArrayBinary SearchSortingHeap (Priority Queue)+1

LeetCode ↗64% acc.

MediumInteger to Roman✓ Our Solution

Hash TableMathString

LeetCode ↗69% acc.

EasyValid Parentheses✓ Our Solution

StringStack

LeetCode ↗42% acc.

HardMerge k Sorted Lists✓ Our Solution

Linked ListDivide and ConquerHeap (Priority Queue)Merge Sort

LeetCode ↗57% acc.

MediumMultiply Strings✓ Our Solution

MathStringSimulation

LeetCode ↗42% acc.

HardWildcard Matching✓ Our Solution

StringDynamic ProgrammingGreedyRecursion

LeetCode ↗30% acc.

HardPermutation Sequence✓ Our Solution

MathRecursion

LeetCode ↗50% acc.

EasyPascal's Triangle✓ Our Solution

ArrayDynamic Programming

LeetCode ↗77% acc.

HardWord Break II✓ Our Solution

ArrayHash TableStringDynamic Programming+3

LeetCode ↗54% acc.

EasyTime Needed to Buy Tickets✓ Our Solution

ArrayQueueSimulation

LeetCode ↗71% acc.

HardMax Points on a Line✓ Our Solution

ArrayHash TableMathGeometry

LeetCode ↗29% acc.

MediumOne Edit Distance

Two PointersString

LeetCode ↗34% acc.

EasyHappy Number✓ Our Solution

Hash TableMathTwo Pointers

LeetCode ↗58% acc.

EasyReverse Linked List✓ Our Solution

Linked ListRecursion

LeetCode ↗79% acc.

HardThe Skyline Problem✓ Our Solution

ArrayDivide and ConquerBinary Indexed TreeSegment Tree+3

LeetCode ↗44% acc.

MediumLowest Common Ancestor of a Binary Search Tree✓ Our Solution

TreeDepth-First SearchBinary Search TreeBinary Tree

LeetCode ↗68% acc.

MediumFlatten 2D Vector

ArrayTwo PointersDesignIterator

LeetCode ↗50% acc.

HardAlien Dictionary

ArrayStringDepth-First SearchBreadth-First Search+2

LeetCode ↗37% acc.

HardDesign Skiplist✓ Our Solution

Linked ListDesign

LeetCode ↗58% acc.

MediumNumber of Connected Components in an Undirected Graph

Depth-First SearchBreadth-First SearchUnion FindGraph

LeetCode ↗64% acc.

MediumRandom Pick with Weight✓ Our Solution

ArrayMathBinary SearchPrefix Sum+1

LeetCode ↗48% acc.

MediumNumber of Islands✓ Our Solution

ArrayDepth-First SearchBreadth-First SearchUnion Find+1

LeetCode ↗62% acc.

MediumRotting Oranges✓ Our Solution

ArrayBreadth-First SearchMatrix

LeetCode ↗57% acc.