Swift Practice Vault

Algorithm Solutions in Swift

Curated problem solutions across LeetCode, HackerRank, AlgoExpert, GeekForGeeks, and Pramp, with an auto-updating index from every commit.

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Algorithms Solutions in Swift

This repository contains Swift solutions from AlgoExpert, LeetCode, HackerRank, GeekForGeeks, and Pramp.

Suggestions and contributions are welcome.

How to Use

• Use search and platform filters to quickly find a problem.
• Open Problem for the original prompt and Solution for this repository implementation.
• Update Difficulty, Topic/Pattern, or Problem Link overrides in scripts/readme-metadata.tsv.

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HackerRank #1

3D Surface Area

UnknownGeneral

Problem Solution

HackerRank #2

Almost Sorted

UnknownSorting

Problem Solution

HackerRank #3

Binary Search Trees

UnknownTree

Problem Solution

HackerRank #4

Bitwise AND

UnknownGeneral

Problem Solution

HackerRank #5

Convert Decimal To Binary

UnknownGeneral

Problem Solution

HackerRank #6

Count Pairs

UnknownGeneral

Problem Solution

HackerRank #7

Encryption

UnknownGeneral

Problem Solution

HackerRank #8

Extra Long Factorials

UnknownGeneral

Problem Solution

HackerRank #9

Larry's Array

UnknownArray

Problem Solution

HackerRank #10

Merge Sort

UnknownSorting

Problem Solution

HackerRank #11

Palindrome String

UnknownString

Problem Solution

HackerRank #12

Reverse String

UnknownString

Problem Solution

HackerRank #13

Sum of Natural Number

UnknownArray

Problem Solution

HackerRank #14

Tic Tac Toe Winner

UnknownGeneral

Problem Solution

HackerRank #15

Two Strings

UnknownString

Problem Solution

LeetCode #1

3 Sum Closest

UnknownArray

Problem Solution

LeetCode #2

Add Digits

UnknownGeneral

Problem Solution

LeetCode #3

Add Strings

UnknownString

Problem Solution

LeetCode #4

Array Intersection

UnknownArray

Problem Solution

LeetCode #5

Array Pair Sum

UnknownArray

Problem Solution

LeetCode #6

Array Rotation

UnknownArray

Problem Solution

LeetCode #7

Asteroid Collision

UnknownGeneral

Problem Solution

LeetCode #8

Best Time to Buy and Sell Stock

UnknownGeneral

Problem Solution

LeetCode #9

Binary Search

UnknownSearching

Problem Solution

LeetCode #10

Bucket Sort

UnknownSorting

Problem Solution

LeetCode #11

Build a Matrix With Conditions

UnknownMatrix

Problem Solution

LeetCode #12

Can Construct

UnknownGeneral

Problem Solution

LeetCode #13

Can Make Arithmetic Progression

UnknownGeneral

Problem Solution

LeetCode #14

Candy Swap

UnknownGeneral

Problem Solution

LeetCode #15

Close Strings

UnknownString

Problem Solution

LeetCode #16

Concatenation of Array

UnknownArray

Problem Solution

LeetCode #17

Confusing Number

UnknownGeneral

Problem Solution

LeetCode #18

Container With Most Water

UnknownGeneral

Problem Solution

LeetCode #19

Contains Duplicate

UnknownGeneral

Problem Solution

LeetCode #20

Convert Time Minimum Operations

UnknownGeneral

Problem Solution

LeetCode #21

Count And Say

UnknownGeneral

Problem Solution

LeetCode #22

Count Negatives

UnknownGeneral

Problem Solution

LeetCode #23

Count Pairs

UnknownGeneral

Problem Solution

LeetCode #24

Delete Node in a Linked List

UnknownLinked List

Problem Solution

LeetCode #25

Design HashMap

UnknownGeneral

Problem Solution

LeetCode #26

Divide Two Integers

UnknownGeneral

Problem Solution

LeetCode #27

Dota2 Senate

UnknownGeneral

Problem Solution

LeetCode #28

Encode Decode Strings

UnknownString

Problem Solution

LeetCode #29

Find All People With Secrets

UnknownGeneral

Problem Solution

LeetCode #30

Find Differences String

UnknownString

Problem Solution

LeetCode #31

Find Peak Element

UnknownGeneral

Problem Solution

LeetCode #32

Find Players Zero or One Loses

UnknownGeneral

Problem Solution

LeetCode #33

Find kth Largest Element

UnknownGeneral

Problem Solution

LeetCode #34

Find the Index of the First Occurrence in a String

UnknownString

Problem Solution

LeetCode #35

First Bad Version

UnknownGeneral

Problem Solution

LeetCode #36

First Unique Character In String

UnknownString

Problem Solution

LeetCode #37

Fixed Point

UnknownGeneral

Problem Solution

LeetCode #38

Flood Fill

UnknownGeneral

Problem Solution

LeetCode #39

Four Sum

UnknownArray

Problem Solution

LeetCode #40

Group Anagrams

UnknownString

Problem Solution

LeetCode #41

HashMap

UnknownGeneral

Problem Solution

LeetCode #42

HashSet

UnknownGeneral

Problem Solution

LeetCode #43

Increasing Triplet Subsequence

UnknownGeneral

Problem Solution

LeetCode #44

Intersection of Two Array II

UnknownArray

Problem Solution

LeetCode #45

Is Alien Sorted

UnknownSorting

Problem Solution

LeetCode #46

Is Majority Element

UnknownGeneral

Problem Solution

LeetCode #47

Largest Integer Digit Swaps Parity

UnknownGeneral

Problem Solution

LeetCode #48

Largest Triangle Area

UnknownGeneral

Problem Solution

LeetCode #49

License Key Formatting

UnknownGeneral

Problem Solution

LeetCode #50

Linked List Cycle

UnknownLinked List

Problem Solution

LeetCode #51

Longest Common Prefix

UnknownGeneral

Problem Solution

LeetCode #52

Longest Consecutive Sequence

UnknownGeneral

Problem Solution

LeetCode #53

Longest Palindrome

UnknownString

Problem Solution

LeetCode #54

Longest Substring without Repeating Characters

UnknownTree

Problem Solution

LeetCode #55

Majority Element

UnknownGeneral

Problem Solution

LeetCode #56

Majority Element 2

UnknownGeneral

Problem Solution

LeetCode #57

Max Area of Island

UnknownMatrix

Problem Solution

LeetCode #58

Max Distance

UnknownGeneral

Problem Solution

LeetCode #59

Max Number of Vowels

UnknownGeneral

Problem Solution

LeetCode #60

Maximum Bags with Full Capacity of Rocks

UnknownGeneral

Problem Solution

LeetCode #61

Maximum Count

UnknownGeneral

Problem Solution

LeetCode #62

Maximum Depth of a Binary Tree

UnknownTree

Problem Solution

LeetCode #63

Maximum Score From Removing Substrings

UnknownTree

Problem Solution

LeetCode #64

Merge In Place

UnknownGeneral

Problem Solution

LeetCode #65

Merge Intervals

UnknownGeneral

Problem Solution

LeetCode #66

Merge Strings Alternatively

UnknownString

Problem Solution

LeetCode #67

Merge Two Binary Trees

UnknownTree

Problem Solution

LeetCode #68

MergeIntervals

UnknownGeneral

Problem Solution

LeetCode #69

MergeKLists

UnknownGeneral

Problem Solution

LeetCode #70

Message Logger

UnknownGeneral

Problem Solution

LeetCode #71

Middle of the Linked List

UnknownLinked List

Problem Solution

LeetCode #72

Min Stack

UnknownStack / Queue

Problem Solution

LeetCode #73

Minimum Window Substring

UnknownTree

Problem Solution

LeetCode #74

Missing Ranges

UnknownGeneral

Problem Solution

LeetCode #75

Move Zeros to End

UnknownGeneral

Problem Solution

LeetCode #76

Multiply Strings

UnknownString

Problem Solution

LeetCode #77

Next Permutation

UnknownGeneral

Problem Solution

LeetCode #78

Non-Overlapping Intervals

UnknownGeneral

Problem Solution

LeetCode #79

Palindrome Linked List

UnknownLinked List

Problem Solution

LeetCode #80

Partition Labels

UnknownGeneral

Problem Solution

LeetCode #81

Pascal's Triangle II

UnknownGeneral

Problem Solution

LeetCode #82

Permutation in String

UnknownString

Problem Solution

LeetCode #83

Plus One

UnknownGeneral

Problem Solution

LeetCode #84

Populating Next Right Pointer in Each Node

UnknownGeneral

Problem Solution

LeetCode #85

Product of Array Except Self

UnknownArray

Problem Solution

LeetCode #86

Randomized Set

UnknownGeneral

Problem Solution

LeetCode #87

Recursive Bubble Sort

UnknownSorting

Problem Solution

LeetCode #88

Recursive Insertion Sort

UnknownSorting

Problem Solution

LeetCode #89

Remove Duplicates Sorted Array

UnknownSorting

Problem Solution

LeetCode #90

Remove Element

UnknownGeneral

Problem Solution

LeetCode #91

Remove Nth Node From End of List

UnknownGeneral

Problem Solution

LeetCode #92

Remove Nth Node from Linked List

UnknownLinked List

Problem Solution

LeetCode #93

Reverse Integer

UnknownGeneral

Problem Solution

LeetCode #94

Reverse Linked Lists

UnknownLinked List

Problem Solution

LeetCode #95

Reverse Pairs

UnknownGeneral

Problem Solution

LeetCode #96

Reverse String

UnknownString

Problem Solution

LeetCode #97

Reverse Words in a String

UnknownString

Problem Solution

LeetCode #98

Rotate Array

UnknownArray

Problem Solution

LeetCode #99

Rotate Image

UnknownGeneral

Problem Solution

LeetCode #100

Running Sum 1D Array

UnknownArray

Problem Solution

LeetCode #101

Search 2D Matrix

UnknownMatrix

Problem Solution

LeetCode #102

Search Insert Position

UnknownSearching

Problem Solution

LeetCode #103

Search a 2D Matrix II

UnknownMatrix

Problem Solution

LeetCode #104

Set Zeros Matrix

UnknownMatrix

Problem Solution

LeetCode #105

Shortest Distance

UnknownGeneral

Problem Solution

LeetCode #106

Single Number

UnknownGeneral

Problem Solution

LeetCode #107

Sort An Array

UnknownSorting

Problem Solution

LeetCode #108

Sort Array By Parity II

UnknownSorting

Problem Solution

LeetCode #109

Sort Colors

UnknownSorting

Problem Solution

LeetCode #110

Sort by Parity

UnknownSorting

Problem Solution

LeetCode #111

Sorted and Rotated Array

UnknownSorting

Problem Solution

LeetCode #112

Spiral Matrix II

UnknownMatrix

Problem Solution

LeetCode #113

Sprial Matrix

UnknownMatrix

Problem Solution

LeetCode #114

Squares of a Sorted Array

UnknownSorting

Problem Solution

LeetCode #115

String to Integer(atoi)

UnknownString

Problem Solution

LeetCode #116

Strings Multiply

UnknownString

Problem Solution

LeetCode #117

Sub Array Sum Equals K

UnknownArray

Problem Solution

LeetCode #118

Subsets

UnknownGeneral

Problem Solution

LeetCode #119

Symmetric Tree

UnknownTree

Problem Solution

LeetCode #120

Target Indicies

UnknownGeneral

Problem Solution

LeetCode #121

Three Parts Equal Sum

UnknownArray

Problem Solution

LeetCode #122

Three Sum Smaller

UnknownArray

Problem Solution

LeetCode #123

Three Sum Zero

UnknownArray

Problem Solution

LeetCode #124

Top K Frequent Elements

UnknownGeneral

Problem Solution

LeetCode #125

Topological Sort

UnknownGraph

Problem Solution

LeetCode #126

Two Number Sum - Sorted Input Array

UnknownSorting

Problem Solution

LeetCode #127

Two Sum Less Than K

UnknownArray

Problem Solution

LeetCode #128

Ugly Number

UnknownGeneral

Problem Solution

LeetCode #129

Unique Binary Search Tree 2

UnknownTree

Problem Solution

LeetCode #130

Unique Email Address

UnknownGeneral

Problem Solution

LeetCode #131

Valid Anagram

UnknownString

Problem Solution

LeetCode #132

Valid Palindrome 2

UnknownString

Problem Solution

LeetCode #133

Valid Parantheses

UnknownGeneral

Problem Solution

LeetCode #134

Valid Parentheses

UnknownGeneral

Problem Solution

LeetCode #135

Valid Suduku

UnknownGeneral

Problem Solution

LeetCode #136

Word Pattern

UnknownString

Problem Solution

AlgoExpert #1

Apartment Hunting

UnknownGeneral

Problem N/A Solution

AlgoExpert #2

Array of Products

UnknownArray

Problem N/A Solution

AlgoExpert #3

BST Construction

UnknownTree

Problem N/A Solution

AlgoExpert #4

BST Traversal

UnknownTree

Problem N/A Solution

AlgoExpert #5

Balanced Brackets

UnknownGeneral

Problem N/A Solution

AlgoExpert #6

Binary Search

UnknownSearching

Problem N/A Solution

AlgoExpert #7

Binary Tree Diameter

UnknownTree

Problem N/A Solution

AlgoExpert #8

Branch Sums

UnknownArray

Problem N/A Solution

AlgoExpert #9

Breadth First Search

UnknownSearching

Problem N/A Solution

AlgoExpert #10

Bubble Sort

UnknownSorting

Problem N/A Solution

AlgoExpert #11

Caesar Cipher Encryptor

UnknownGeneral

Problem N/A Solution

AlgoExpert #12

Calender Matching

UnknownGeneral

Problem N/A Solution

AlgoExpert #13

Class Photos

UnknownGeneral

Problem N/A Solution

AlgoExpert #14

Depth First Search

UnknownSearching

Problem N/A Solution

AlgoExpert #15

Find Closest Value In BST

UnknownTree

Problem N/A Solution

AlgoExpert #16

Find Kth Largest Node in BST

UnknownTree

Problem N/A Solution

AlgoExpert #17

Find Loop in Linked List

UnknownLinked List

Problem N/A Solution

AlgoExpert #18

Find Nodes Distance K

UnknownGeneral

Problem N/A Solution

AlgoExpert #19

Find Successor

UnknownGeneral

Problem N/A Solution

AlgoExpert #20

Find Three Largest Numbers

UnknownGeneral

Problem N/A Solution

AlgoExpert #21

First Duplicate Value

UnknownGeneral

Problem N/A Solution

AlgoExpert #22

First Non Repeating Character

UnknownGeneral

Problem N/A Solution

AlgoExpert #23

Four Number Sum

UnknownArray

Problem N/A Solution

AlgoExpert #24

Generate Document

UnknownGeneral

Problem N/A Solution

AlgoExpert #25

Group Anagrams

UnknownString

Problem N/A Solution

AlgoExpert #26

Height Balanced Binary Tree

UnknownTree

Problem N/A Solution

AlgoExpert #27

Insertion Sort

UnknownSorting

Problem N/A Solution

AlgoExpert #28

Invert Binary Tree

UnknownTree

Problem N/A Solution

AlgoExpert #29

Kadanes Algorithm

UnknownGeneral

Problem N/A Solution

AlgoExpert #30

LRU Cache

UnknownGeneral

Problem N/A Solution

AlgoExpert #31

Largest Range

UnknownGeneral

Problem N/A Solution

AlgoExpert #32

Levenshtein Distance

UnknownGeneral

Problem N/A Solution

AlgoExpert #33

Linked List Construction

UnknownLinked List

Problem N/A Solution

AlgoExpert #34

Longest Common Subsequence

UnknownGeneral

Problem N/A Solution

AlgoExpert #35

Longest Palindromic Substring

UnknownTree

Problem N/A Solution

AlgoExpert #36

Longest Peak

UnknownGeneral

Problem N/A Solution

AlgoExpert #37

Longest Substring Without Duplication

UnknownTree

Problem N/A Solution

AlgoExpert #38

Lowest Common Manager

UnknownGeneral

Problem N/A Solution

AlgoExpert #39

Max Path Sum

UnknownArray

Problem N/A Solution

AlgoExpert #40

Max Subset Sum No Adjacent

UnknownArray

Problem N/A Solution

AlgoExpert #41

Max Sum Increasing Subsequence

UnknownArray

Problem N/A Solution

AlgoExpert #42

Merge LinkedLists

UnknownGeneral

Problem N/A Solution

AlgoExpert #43

Merge Overlapping Intervals

UnknownGeneral

Problem N/A Solution

AlgoExpert #44

Merge Sort

UnknownSorting

Problem N/A Solution

AlgoExpert #45

Min Height BST

UnknownTree

Problem N/A Solution

AlgoExpert #46

Min Max Stack Construction

UnknownStack / Queue

Problem N/A Solution

AlgoExpert #47

Min Number of Jumps

UnknownGeneral

Problem N/A Solution

AlgoExpert #48

Min Rewards

UnknownGeneral

Problem N/A Solution

AlgoExpert #49

Minimum Waiting Time

UnknownGeneral

Problem N/A Solution

AlgoExpert #50

Monotonic Array

UnknownArray

Problem N/A Solution

AlgoExpert #51

Move Element to End

UnknownGeneral

Problem N/A Solution

AlgoExpert #52

Next Greater Element

UnknownGeneral

Problem N/A Solution

AlgoExpert #53

Node Depths

UnknownGeneral

Problem N/A Solution

AlgoExpert #54

Non-Constructible Change

UnknownGeneral

Problem N/A Solution

AlgoExpert #55

Nth Fibonacci

UnknownGeneral

Problem N/A Solution

AlgoExpert #56

Number of Ways To Traverse Graph

UnknownGraph

Problem N/A Solution

AlgoExpert #57

Number of Ways to Make Change

UnknownGeneral

Problem N/A Solution

AlgoExpert #58

Palindrome Check

UnknownString

Problem N/A Solution

AlgoExpert #59

Permutations

UnknownGeneral

Problem N/A Solution

AlgoExpert #60

Power Set

UnknownGeneral

Problem N/A Solution

AlgoExpert #61

Product Sum

UnknownArray

Problem N/A Solution

AlgoExpert #62

Quick Sort

UnknownSorting

Problem N/A Solution

AlgoExpert #63

Reconstruct BST

UnknownTree

Problem N/A Solution

AlgoExpert #64

Remove Duplicates From Linked List

UnknownLinked List

Problem N/A Solution

AlgoExpert #65

Remove Islands

UnknownMatrix

Problem N/A Solution

AlgoExpert #66

Remove Kth Node From End

UnknownGeneral

Problem N/A Solution

AlgoExpert #67

Reverse Linkedlist

UnknownGeneral

Problem N/A Solution

AlgoExpert #68

Right Smaller Than

UnknownGeneral

Problem N/A Solution

AlgoExpert #69

River Sizes

UnknownGeneral

Problem N/A Solution

AlgoExpert #70

Run Length Encoding

UnknownGeneral

Problem N/A Solution

AlgoExpert #71

Same BSTs

UnknownTree

Problem N/A Solution

AlgoExpert #72

Search For Range

UnknownSearching

Problem N/A Solution

AlgoExpert #73

Search In Sorted Matrix

UnknownMatrix

Problem N/A Solution

AlgoExpert #74

Selection Sort

UnknownSorting

Problem N/A Solution

AlgoExpert #75

Shift Linked List

UnknownLinked List

Problem N/A Solution

AlgoExpert #76

Shifted Binary Search

UnknownSearching

Problem N/A Solution

AlgoExpert #77

Single Cycle Check

UnknownGeneral

Problem N/A Solution

AlgoExpert #78

Smallest Difference

UnknownGeneral

Problem N/A Solution

AlgoExpert #79

Sort Stacks

UnknownSorting

Problem N/A Solution

AlgoExpert #80

Sorted Squared Array

UnknownSorting

Problem N/A Solution

AlgoExpert #81

Spiral Traverse

UnknownMatrix

Problem N/A Solution

AlgoExpert #82

Staircase Traversal

UnknownGeneral

Problem N/A Solution

AlgoExpert #83

Subarray Sort

UnknownSorting

Problem N/A Solution

AlgoExpert #84

Sum of Linked List

UnknownLinked List

Problem N/A Solution

AlgoExpert #85

Sunset Views

UnknownGeneral

Problem N/A Solution

AlgoExpert #86

Tandem Bicycle

UnknownGeneral

Problem N/A Solution

AlgoExpert #87

Task Assignment

UnknownGeneral

Problem N/A Solution

AlgoExpert #88

Three Number Sort

UnknownSorting

Problem N/A Solution

AlgoExpert #89

Three Number Sum

UnknownArray

Problem N/A Solution

AlgoExpert #90

Tournament Winner

UnknownGeneral

Problem N/A Solution

AlgoExpert #91

Two Number Sum

UnknownArray

Problem N/A Solution

AlgoExpert #92

Valid IP Addresses

UnknownGeneral

Problem N/A Solution

AlgoExpert #93

Valid Starting City

UnknownGeneral

Problem N/A Solution

AlgoExpert #94

Validate BST

UnknownTree

Problem N/A Solution

AlgoExpert #95

Validate Subsequence

UnknownGeneral

Problem N/A Solution

AlgoExpert #96

Validate Three Nodes

UnknownGeneral

Problem N/A Solution

AlgoExpert #97

Water Area

UnknownGeneral

Problem N/A Solution

AlgoExpert #98

Youngest Common Ancestor

UnknownGeneral

Problem N/A Solution

AlgoExpert #99

ZigZag Traverse

UnknownGeneral

Problem N/A Solution

GeekForGeeks #1

Nth Root of A Number

UnknownGeneral

Problem Solution

Pramp #1

Nth Root of Number

UnknownGeneral

Problem Solution

Pramp #2

Smallest Substring of All Characters

UnknownTree

Problem Solution