LeetCode Swift

Some solved LeetCode problems in Swift I thought I'd share if someone needs (among like tens of thousands of other resources out there but here it goes anyway)

Contacts

• Telegram: @Nihad_s | https://t.me/Nihad_s

Branches

Problems are categorized into: easy, medium, hard within branches

Problems

Easy

Source	Solution	Tests
Backspace String Compare	Swift	Tests
Best Time to Buy and Sell Stock	Swift	Tests
Binary Tree Inorder Traversal	Swift	Tests
Binary Tree Paths	Swift	Tests
Climbing Stairs	Swift	Tests
Contains Duplicate	Swift	Tests
Delete Node in a Linked List	Swift	—
Diameter of Binary Tree	Swift	Tests
Find Pivot Index	Swift	Tests
First Unique Character in a String	Swift	Tests
Fizz Buzz	Swift	Tests
Happy Number	Swift	Tests
Intersection of Two Arrays II	Swift	Tests
Intersection of Two Linked Lists	Swift	—
Length of Last Word	Swift, C++	Tests
Linked List Cycle	Swift	Tests
Majority Element	Swift	Tests
Maximum Depth of Binary Tree	Swift	Tests
Merge Two Sorted Lists	Swift	Tests
Minimum Difference Between Highest and Lowest of K Scores	Swift	—
Minimum Recolors to Get K Consecutive Black Blocks	Swift	—
Missing Number	Swift	Tests
Move Zeroes	Swift	Tests
Pascals Triangle	Swift	Tests
Plus One	Swift	Tests
Remove Duplicates From Sorted Array	Swift	Tests
Remove Element	Swift	Tests
Reverse Linked List	Swift	Tests
Roman to Integer	Swift	—
Same Tree	Swift	Tests
Single Number	Swift	Tests
Symmetric Tree	Swift	Tests
Two Sum	Swift	—
Valid Anagram	Swift	Tests
Valid Parentheses	Swift, C++	Tests
Path Sum	Swift	Tests
Detect Capital	Swift	Tests
Delete Columns to Make Sorted	Swift	Tests
Word Pattern	Swift	Tests
Binary Tree Preorder Traversal	Swift	—
Balanced Binary Tree	Swift	—
Valid Palindrome	Swift	—
Remove Linked List Elements	Swift	—
Intersection of Two Arrays	Swift	—
Contains Duplicate II	Swift	—
Implement Stack using Queues	Swift	—
Replace Elements with Greatest Element on Right Side	Swift	—
Ransom Note	Swift	—
Sum of Left Leaves	Swift	—
Is Subsequence	Swift	—
Reshape the Matrix	Swift	—
Reverse Vowels of a String	Swift	—
Find Winner on a Tic Tac Toe Game	Swift	—
Number of Good Pairs	Swift	—
Shuffle the Array	Swift	—
Left and Right Sum Differences	Swift	—
Convert Sorted Array to Binary Search Tree	Swift	—
N-ary Tree Preorder Traversal	Swift	—
Check If Two String Arrays are Equivalent	Swift	—
Largest 3-Same-Digit Number in String	Swift	—
Count of Matches in Tournament	Swift	—
Calculate Money in Leetcode Bank	Swift	—
Largest Odd Number in String	Swift	—
Construct String from Binary Tree	Swift	—
Transpose Matrix	Swift	—
Element Appearing More Than 25% In Sorted Array	Swift	—
Maximum Product of Two Elements in an Array	Swift	—
Special Positions in a Binary Matrix	Swift	—
Destination City	Swift	—
Maximum Product Difference Between Two Pairs	Swift	—
Summary Ranges	Swift	—
Pascal's Triangle II	Swift	—
Image Smoother	Swift	—
Buy Two Chocolates	Swift	—
Maximum Score After Splitting a String	Swift	—
Path Crossing	Swift	—
Minimum Changes To Make Alternating Binary String	Swift	—
Middle of the Linked List	Swift	—
Search Insert Position	Swift	—

Medium

Source	Solution	Tests
Maximum Subarray	Swift	Tests
Min Stack	Swift	Tests
Add Two Numbers	Swift	Tests
Airplane Seat Assignment Probability	Swift	Tests
Binary Tree Level Order Traversal II	Swift	Tests
Binary Tree Level Order Traversal	Swift	—
Binary Tree Zigzag Level Order Traversal	Swift	Tests
Combination Sum 2	Swift	Tests
Combination Sum	Swift	Tests
Combinations	Swift	Tests
Container With Most Water	Swift	Tests
Copy List With Random Pointer	Swift	—
Course Schedule	Swift	Tests
Design Add and Search Words Data Structure	Swift	Tests
Find Bottom Left Tree Value	Swift	Tests
Find the Duplicate Number	Swift	Tests
Flatten Binary Tree to Linked List	Swift	—
Game of Life	Swift	Tests
Generate Parentheses	Swift	Tests
Group Anagrams	Swift	Tests
House Robber	Swift	Tests
Insert Delete Get Random O(1)	Swift	—
Integer to Roman	Swift	Tests
Jump Game	Swift	Tests
Kth Largest Element in an Array	Swift	—
Kth Smallest Element in a BST	Swift	Tests
LRU Cache	Swift	Tests
Letter Combinations of a Phone Number	Swift	Tests
Longest Consecutive Sequence	Swift	Tests
Longest Increasing Subsequence	Swift	Tests
Longest Palindromic Substring	Swift, C++	—
Longest Substring Without Repeating Characters	Swift	Tests
Merge Intervals	Swift	Tests
Minimum Path Sum	Swift	Tests
My Calendar I	Swift	Tests
Number of Islands	Swift	Tests
Odd Even Linked List	Swift	—
Palindrome Partitioning	Swift	Tests
Permutations	Swift	Tests
Product of Array Except Self	Swift	Tests
Push Dominoes	Swift	Tests
Remove Nth Node from End of List	Swift	—
Reverse Integer	Swift	Tests
Reverse Words in a String	Swift	Tests
Rotate Array	Swift	Tests
Rotate Image	Swift	Tests
Rotate List	Swift	—
Search a 2D Matrix II	Swift	Tests
Set Matrix Zeroes	Swift	Tests
Sort Colors	Swift	Tests
Sort the Matrix Diagonally	Swift	Tests
Subsets	Swift	Tests
Top K Frequent Elements	Swift	Tests
Unique Binary Search Trees	Swift	Tests
Unique Paths	Swift	Tests
Valid Sudoku	Swift	Tests
Validate Binary Search Tree	Swift	Tests
Word Break	Swift	Tests
Word Search	Swift	Tests
Path Sum II	Swift	Tests
Sum Root to Leaf Numbers	Swift	Tests
Minimum Rounds to Complete All Tasks	Swift	Tests
Gas Station	Swift	Tests
Minimum Number of Arrows to Burst Balloons	Swift	Tests
Maximum Ice Cream Bars	Swift	Tests
Zigzag Conversion	Swift	Tests
Sort List	Swift	—
Minimum Time to Collect All Apples in a Tree	Swift	—
Number of Nodes in the Sub-Tree With the Same Label	Swift	—
Swap Nodes in Pairs	Swift	—
Lexicographically Smallest Equivalent String	Swift	Tests
Insert Interval	Swift	—
Find Closest Node to Given Two Nodes	Swift	—
Maximum Product Subarray	Swift	—
Shuffle an Array	Swift	—
Two Sum II - Input Array Is Sorted	Swift	—
Find Peak Element	Swift	—
Evaluate Reverse Polish Notation	Swift	—
Course Schedule	Swift	—
Largest Number	Swift	—
Find First and Last Position of Element in Sorted Array	Swift	—
Surrounded Regions	Swift	—
Course Schedule II	Swift	—
Clone Graph	Swift	—
Binary Tree Right Side View	Swift	—
Populating Next Right Pointers in Each Node	Swift	—
Coin Change	Swift	—
Eliminate Maximum Number of Monsters	Swift	—
Perfect Squares	Swift	—
Minimum Height Trees	Swift	—
Basic Calculator II	Swift	—
Triangle	Swift	—
Implement Trie (Prefix Tree)	Swift	—
Best Time to Buy and Sell Stock II	Swift	—
Difference Between Ones and Zeros in Row and Column	Swift	—
Lowest Common Ancestor of a Binary Tree	Swift	—
Design a Food Rating System	Swift	—
Widest Vertical Area Between Two Points Containing No Points	Swift	—
Minimum Falling Path Sum	Swift	—
Length of Longest Subarray With at Most K Frequency	Swift	—
Minimum Size Subarray Sum	Swift	—

Hard

Source	Solution	Tests
Binary Tree Maximum Path Sum	Swift	Tests
Edit Distance	Swift	Tests
First Missing Positive	Swift	Tests
Longest Increasing Path in a Matrix	Swift	Tests
Max Points on a Line	Swift	Tests
Median of Two Sorted Arrays	Swift	Tests
Merge k Sorted Lists	Swift	Tests
N-Queens2	Swift	Tests
N-Queens	Swift	Tests
Serialize and Deserialize Binary Tree	Swift	—
Sliding Window Maximum	Swift	Tests
Sudoku Solver	Swift	Tests
Trapping Rain Water	Swift	Tests
Wildcard Matching	Swift	Tests
Work Break II	Swift	Tests
Reverse Nodes in k-Group	Swift	—
Maximum Score Words Formed by Letters	Swift	—