Algorithms Solutions in Swift

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

Suggestions and contributions are welcome.

How to Use

• Browse by platform section and open Problem Link for the original prompt.
• Open Solution to view the implementation in this repository.
• Update Difficulty, Topic/Pattern, or Problem Link overrides in scripts/readme-metadata.tsv.
• Run ./scripts/update-readme.sh to regenerate all tables (also runs automatically in pre-commit).

HackerRank

Serial No.	Problem	Problem Link	Solution	Difficulty	Topic/Pattern	Notes
1	3D Surface Area	Problem	Solution	_	_	_
2	Almost Sorted	Problem	Solution	_	Sorting	_
3	Binary Search Trees	Problem	Solution	_	Tree	_
4	Bitwise AND	Problem	Solution	_	_	_
5	Convert Decimal To Binary	Problem	Solution	_	_	_
6	Count Pairs	Problem	Solution	_	_	_
7	Encryption	Problem	Solution	_	_	_
8	Extra Long Factorials	Problem	Solution	_	_	_
9	Larry's Array	Problem	Solution	_	Array	_
10	Merge Sort	Problem	Solution	_	Sorting	_
11	Palindrome String	Problem	Solution	_	String	_
12	Reverse String	Problem	Solution	_	String	_
13	Sum of Natural Number	Problem	Solution	_	Array	_
14	Tic Tac Toe Winner	Problem	Solution	_	_	_
15	Two Strings	Problem	Solution	_	String	_

LeetCode

Serial No.	Problem	Problem Link	Solution	Difficulty	Topic/Pattern	Notes
1	3 Sum Closest	Problem	Solution	_	Array	_
2	Add Strings	Problem	Solution	_	String	_
3	Array Rotation	Problem	Solution	_	Array	_
4	Asteroid Collision	Problem	Solution	_	_	_
5	Best Time to Buy and Sell Stock	Problem	Solution	_	_	_
6	Binary Search	Problem	Solution	_	Searching	_
7	Bucket Sort	Problem	Solution	_	Sorting	_
8	Build a Matrix With Conditions	Problem	Solution	_	Matrix	_
9	Close Strings	Problem	Solution	_	String	_
10	Concatenation of Array	Problem	Solution	_	Array	_
11	Container With Most Water	Problem	Solution	_	_	_
12	Contains Duplicate	Problem	Solution	_	_	_
13	Convert Time Minimum Operations	Problem	Solution	_	_	_
14	Delete Node in a Linked List	Problem	Solution	_	Linked List	_
15	Design HashMap	Problem	Solution	_	_	_
16	Divide Two Integers	Problem	Solution	_	_	_
17	Dota2 Senate	Problem	Solution	_	_	_
18	Encode Decode Strings	Problem	Solution	_	String	_
19	Find All People With Secrets	Problem	Solution	_	_	_
20	Find Players Zero or One Loses	Problem	Solution	_	_	_
21	Find kth Largest Element	Problem	Solution	_	_	_
22	Find the Index of the First Occurrence in a String	Problem	Solution	_	String	_
23	First Bad Version	Problem	Solution	_	_	_
24	First Unique Character In String	Problem	Solution	_	String	_
25	Flood Fill	Problem	Solution	_	_	_
26	Four Sum	Problem	Solution	_	Array	_
27	Group Anagrams	Problem	Solution	_	String	_
28	HashMap	Problem	Solution	_	_	_
29	HashSet	Problem	Solution	_	_	_
30	Increasing Triplet Subsequence	Problem	Solution	_	_	_
31	Intersection of Two Array II	Problem	Solution	_	Array	_
32	Largest Integer Digit Swaps Parity	Problem	Solution	_	_	_
33	License Key Formatting	Problem	Solution	_	_	_
34	Linked List Cycle	Problem	Solution	_	Linked List	_
35	Longest Common Prefix	Problem	Solution	_	_	_
36	Longest Consecutive Sequence	Problem	Solution	_	_	_
37	Longest Palindrome	Problem	Solution	_	String	_
38	Longest Substring without Repeating Characters	Problem	Solution	_	Tree	_
39	Majority Element	Problem	Solution	_	_	_
40	Max Area of Island	Problem	Solution	_	Matrix	_
41	Max Number of Vowels	Problem	Solution	_	_	_
42	Maximum Bags with Full Capacity of Rocks	Problem	Solution	_	_	_
43	Maximum Depth of a Binary Tree	Problem	Solution	_	Tree	_
44	Maximum Score From Removing Substrings	Problem	Solution	_	Tree	_
45	Merge Intervals	Problem	Solution	_	_	_
46	Merge Strings Alternatively	Problem	Solution	_	String	_
47	Merge Two Binary Trees	Problem	Solution	_	Tree	_
48	MergeIntervals	Problem	Solution	_	_	_
49	MergeKLists	Problem	Solution	_	_	_
50	Middle of the Linked List	Problem	Solution	_	Linked List	_
51	Min Stack	Problem	Solution	_	Stack / Queue	_
52	Minimum Window Substring	Problem	Solution	_	Tree	_
53	Move Zeros to End	Problem	Solution	_	_	_
54	Multiply Strings	Problem	Solution	_	String	_
55	Non-Overlapping Intervals	Problem	Solution	_	_	_
56	Palindrome Linked List	Problem	Solution	_	Linked List	_
57	Partition Labels	Problem	Solution	_	_	_
58	Pascal's Triangle II	Problem	Solution	_	_	_
59	Permutation in String	Problem	Solution	_	String	_
60	Plus One	Problem	Solution	_	_	_
61	Populating Next Right Pointer in Each Node	Problem	Solution	_	_	_
62	Product of Array Except Self	Problem	Solution	_	Array	_
63	Randomized Set	Problem	Solution	_	_	_
64	Recursive Bubble Sort	Problem	Solution	_	Sorting	_
65	Recursive Insertion Sort	Problem	Solution	_	Sorting	_
66	Remove Duplicates Sorted Array	Problem	Solution	_	Sorting	_
67	Remove Element	Problem	Solution	_	_	_
68	Remove Nth Node From End of List	Problem	Solution	_	_	_
69	Remove Nth Node from Linked List	Problem	Solution	_	Linked List	_
70	Reverse Integer	Problem	Solution	_	_	_
71	Reverse Linked Lists	Problem	Solution	_	Linked List	_
72	Reverse String	Problem	Solution	_	String	_
73	Reverse Words in a String	Problem	Solution	_	String	_
74	Rotate Array	Problem	Solution	_	Array	_
75	Rotate Image	Problem	Solution	_	_	_
76	Running Sum 1D Array	Problem	Solution	_	Array	_
77	Search 2D Matrix	Problem	Solution	_	Matrix	_
78	Search Insert Position	Problem	Solution	_	Searching	_
79	Search a 2D Matrix II	Problem	Solution	_	Matrix	_
80	Set Zeros Matrix	Problem	Solution	_	Matrix	_
81	Single Number	Problem	Solution	_	_	_
82	Sort An Array	Problem	Solution	_	Sorting	_
83	Sort Colors	Problem	Solution	_	Sorting	_
84	Sort by Parity	Problem	Solution	_	Sorting	_
85	Sorted and Rotated Array	Problem	Solution	_	Sorting	_
86	Spiral Matrix II	Problem	Solution	_	Matrix	_
87	Sprial Matrix	Problem	Solution	_	Matrix	_
88	Squares of a Sorted Array	Problem	Solution	_	Sorting	_
89	String to Integer(atoi)	Problem	Solution	_	String	_
90	Strings Multiply	Problem	Solution	_	String	_
91	Sub Array Sum Equals K	Problem	Solution	_	Array	_
92	Subsets	Problem	Solution	_	_	_
93	Symmetric Tree	Problem	Solution	_	Tree	_
94	Three Sum Smaller	Problem	Solution	_	Array	_
95	Three Sum Zero	Problem	Solution	_	Array	_
96	Top K Frequent Elements	Problem	Solution	_	_	_
97	Topological Sort	Problem	Solution	_	Graph	_
98	Two Number Sum - Sorted Input Array	Problem	Solution	_	Sorting	_
99	Unique Binary Search Tree 2	Problem	Solution	_	Tree	_
100	Unique Email Address	Problem	Solution	_	_	_
101	Valid Anagram	Problem	Solution	_	String	_
102	Valid Palindrome 2	Problem	Solution	_	String	_
103	Valid Parantheses	Problem	Solution	_	_	_
104	Valid Parentheses	Problem	Solution	_	_	_
105	Valid Suduku	Problem	Solution	_	_	_
106	Word Pattern	Problem	Solution	_	String	_

AlgoExpert

Serial No.	Problem	Problem Link	Solution	Difficulty	Topic/Pattern	Notes
1	Apartment Hunting	_	Solution	_	_	_
2	Array of Products	_	Solution	_	Array	_
3	BST Construction	_	Solution	_	Tree	_
4	BST Traversal	_	Solution	_	Tree	_
5	Balanced Brackets	_	Solution	_	_	_
6	Binary Search	_	Solution	_	Searching	_
7	Binary Tree Diameter	_	Solution	_	Tree	_
8	Branch Sums	_	Solution	_	Array	_
9	Breadth First Search	_	Solution	_	Searching	_
10	Bubble Sort	_	Solution	_	Sorting	_
11	Caesar Cipher Encryptor	_	Solution	_	_	_
12	Calender Matching	_	Solution	_	_	_
13	Class Photos	_	Solution	_	_	_
14	Depth First Search	_	Solution	_	Searching	_
15	Find Closest Value In BST	_	Solution	_	Tree	_
16	Find Kth Largest Node in BST	_	Solution	_	Tree	_
17	Find Loop in Linked List	_	Solution	_	Linked List	_
18	Find Nodes Distance K	_	Solution	_	_	_
19	Find Successor	_	Solution	_	_	_
20	Find Three Largest Numbers	_	Solution	_	_	_
21	First Duplicate Value	_	Solution	_	_	_
22	First Non Repeating Character	_	Solution	_	_	_
23	Four Number Sum	_	Solution	_	Array	_
24	Generate Document	_	Solution	_	_	_
25	Group Anagrams	_	Solution	_	String	_
26	Height Balanced Binary Tree	_	Solution	_	Tree	_
27	Insertion Sort	_	Solution	_	Sorting	_
28	Invert Binary Tree	_	Solution	_	Tree	_
29	Kadanes Algorithm	_	Solution	_	_	_
30	LRU Cache	_	Solution	_	_	_
31	Largest Range	_	Solution	_	_	_
32	Levenshtein Distance	_	Solution	_	_	_
33	Linked List Construction	_	Solution	_	Linked List	_
34	Longest Common Subsequence	_	Solution	_	_	_
35	Longest Palindromic Substring	_	Solution	_	Tree	_
36	Longest Peak	_	Solution	_	_	_
37	Longest Substring Without Duplication	_	Solution	_	Tree	_
38	Lowest Common Manager	_	Solution	_	_	_
39	Max Path Sum	_	Solution	_	Array	_
40	Max Subset Sum No Adjacent	_	Solution	_	Array	_
41	Max Sum Increasing Subsequence	_	Solution	_	Array	_
42	Merge LinkedLists	_	Solution	_	_	_
43	Merge Overlapping Intervals	_	Solution	_	_	_
44	Merge Sort	_	Solution	_	Sorting	_
45	Min Height BST	_	Solution	_	Tree	_
46	Min Max Stack Construction	_	Solution	_	Stack / Queue	_
47	Min Number of Jumps	_	Solution	_	_	_
48	Min Rewards	_	Solution	_	_	_
49	Minimum Waiting Time	_	Solution	_	_	_
50	Monotonic Array	_	Solution	_	Array	_
51	Move Element to End	_	Solution	_	_	_
52	Next Greater Element	_	Solution	_	_	_
53	Node Depths	_	Solution	_	_	_
54	Non-Constructible Change	_	Solution	_	_	_
55	Nth Fibonacci	_	Solution	_	_	_
56	Number of Ways To Traverse Graph	_	Solution	_	Graph	_
57	Number of Ways to Make Change	_	Solution	_	_	_
58	Palindrome Check	_	Solution	_	String	_
59	Permutations	_	Solution	_	_	_
60	Power Set	_	Solution	_	_	_
61	Product Sum	_	Solution	_	Array	_
62	Quick Sort	_	Solution	_	Sorting	_
63	Reconstruct BST	_	Solution	_	Tree	_
64	Remove Duplicates From Linked List	_	Solution	_	Linked List	_
65	Remove Islands	_	Solution	_	Matrix	_
66	Remove Kth Node From End	_	Solution	_	_	_
67	Reverse Linkedlist	_	Solution	_	_	_
68	Right Smaller Than	_	Solution	_	_	_
69	River Sizes	_	Solution	_	_	_
70	Run Length Encoding	_	Solution	_	_	_
71	Same BSTs	_	Solution	_	Tree	_
72	Search For Range	_	Solution	_	Searching	_
73	Search In Sorted Matrix	_	Solution	_	Matrix	_
74	Selection Sort	_	Solution	_	Sorting	_
75	Shift Linked List	_	Solution	_	Linked List	_
76	Shifted Binary Search	_	Solution	_	Searching	_
77	Single Cycle Check	_	Solution	_	_	_
78	Smallest Difference	_	Solution	_	_	_
79	Sort Stacks	_	Solution	_	Sorting	_
80	Sorted Squared Array	_	Solution	_	Sorting	_
81	Spiral Traverse	_	Solution	_	Matrix	_
82	Staircase Traversal	_	Solution	_	_	_
83	Subarray Sort	_	Solution	_	Sorting	_
84	Sum of Linked List	_	Solution	_	Linked List	_
85	Sunset Views	_	Solution	_	_	_
86	Tandem Bicycle	_	Solution	_	_	_
87	Task Assignment	_	Solution	_	_	_
88	Three Number Sort	_	Solution	_	Sorting	_
89	Three Number Sum	_	Solution	_	Array	_
90	Tournament Winner	_	Solution	_	_	_
91	Two Number Sum	_	Solution	_	Array	_
92	Valid IP Addresses	_	Solution	_	_	_
93	Valid Starting City	_	Solution	_	_	_
94	Validate BST	_	Solution	_	Tree	_
95	Validate Subsequence	_	Solution	_	_	_
96	Validate Three Nodes	_	Solution	_	_	_
97	Water Area	_	Solution	_	_	_
98	Youngest Common Ancestor	_	Solution	_	_	_
99	ZigZag Traverse	_	Solution	_	_	_

GeekForGeeks

Serial No.	Problem	Problem Link	Solution	Difficulty	Topic/Pattern	Notes
1	Nth Root of A Number	Problem	Solution	_	_	_

Pramp

Serial No.	Problem	Problem Link	Solution	Difficulty	Topic/Pattern	Notes
1	Nth Root of Number	Problem	Solution	_	_	_
2	Smallest Substring of All Characters	Problem	Solution	_	Tree	_

Maintenance

This README is generated from the repository directory structure.