Leetcode Solutions

This collection features my detailed solutions to a wide range of LeetCode algorithm questions. Whether you're preparing for technical interviews at top-tier companies or simply looking to enhance your coding skills, you'll find a wealth of valuable insights and problem-solving approaches here. Feel free to explore, learn, and contribute to this growing resource. Happy coding!

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LeetCode 75

https://leetcode.com/studyplan/leetcode-75/

Array / String

#	Problem	Solution
1768	Merge Strings Alternately	python3
1071	Greatest Common Divisor of Strings	python3
1431	Kids With the Greatest Number of Candies	python3
605	Can Place Flowers	python3
345	Reverse Vowels of a String	python3
151	Reverse Words in a String	python3
238	Product of Array Except Self	python3
334	Increasing Triplet Subsequence	python3
443	String Compression	python3

Two Pointers

#	Problem	Solution
283	Move Zeroes	python3
392	Is Subsequence	python3
11	Container With Most Water	python3
1679	Max Number of K-Sum Pairs	python3

Sliding Window

#	Problem	Solution
643	Maximum Average Subarray I	python3
1456	Maximum Number of Vowels in a Substring of Given Length	python3
1004	Max Consecutive Ones III	python3
1493	Longest Subarray of 1's After Deleting One Element	python3

Prefix Sum

#	Problem	Solution
1732	Find the Highest Altitude	python3
724	Find Pivot Index	python3

Hash Map / Set

#	Problem	Solution
2215	Find the Difference of Two Arrays	python3
1207	Unique Number of Occurrences	python3
1657	Determine if Two Strings Are Close	python3
2352	Equal Row and Column Pairs	python3

Stack

#	Problem	Solution
2390	Removing Stars From a String	python3
735	Asteroid Collision	python3
394	Decode String	python3

Queue

#	Problem	Solution
933	Number of Recent Calls	python3
649	Dota2 Senate	python3

Linked List

#	Problem	Solution
2095	Delete the Middle Node of a Linked List	python3
328	Odd Even Linked List	python3
206	Reverse Linked List	python3
2130	Maximum Twin Sum of a Linked List	python3

Binary Tree - DFS

#	Problem	Solution
104	Maximum Depth of Binary Tree	python3
872	Leaf-Similar Trees	python3
1448	Count Good Nodes in Binary Tree	python3
437	Path Sum III	python3
1372	Longest ZigZag Path in a Binary Tree	python3
236	Lowest Common Ancestor of a Binary Tree	python3

Binary Tree - BFS

#	Problem	Solution
199	Binary Tree Right Side View	python3
1161	Maximum Level Sum of a Binary Tree	python3

Binary Search Tree

#	Problem	Solution
700	Search in a Binary Search Tree	python3
450	Delete Node in a BST	python3

Graphs - DFS

#	Problem	Solution
841	Keys and Rooms	python3
547	Number of Provinces	python3
1466	Reorder Routes to Make All Paths Lead to the City Zero	python3
399	Evaluate Division	python3

Graphs - BFS

#	Problem	Solution
1926	Nearest Exit from Entrance in Maze	python3
994	Rotting Oranges	python3

Heap / Priority Queue

#	Problem	Solution
215	Kth Largest Element in an Array	python3
2336	Smallest Number in Infinite Set	python3
2542	Maximum Subsequence Score	python3
2462	Total Cost to Hire K Workers	python3

Binary Search

#	Problem	Solution
374	Guess Number Higher or Lower	python3
2300	Successful Pairs of Spells and Potions	python3
162	Find Peak Element	python3
875	Koko Eating Bananas	python3

Backtracking

#	Problem	Solution
17	Letter Combinations of a Phone Number	python3
216	Combination Sum III	python3

DP - 1D

#	Problem	Solution
1137	N-th Tribonacci Number	python3
746	Min Cost Climbing Stairs	python3
198	House Robber	python3
790	Domino and Tromino Tiling	python3

DP - Multidimensional

#	Problem	Solution
62	Unique Paths	python3
1143	Longest Common Subsequence	python3
714	Best Time to Buy and Sell Stock with Transaction Fee	python3
72	Edit Distance	python3

Bit Manipulation

#	Problem	Solution
338	Counting Bits	python3
136	Single Number	python3
1318	Minimum Flips to Make a OR b Equal to c	python3

Trie

#	Problem	Solution
208	Implement Trie (Prefix Tree)	python3
1268	Search Suggestions System	python3

Intervals

#	Problem	Solution
435	Non-overlapping Intervals	python3
452	Minimum Number of Arrows to Burst Balloons	python3

Monotonic Stack

#	Problem	Solution
739	Daily Temperatures	python3
901	Online Stock Span	python3

Top Interview 150

https://leetcode.com/studyplan/top-interview-150/

Array / String

#	Problem	Solution
88	Merge Sorted Array	python3
27	Remove Element	python3
26	Remove Duplicates from Sorted Array	python3
80	Remove Duplicates from Sorted Array II	python3
169	Majority Element	python3
189	Rotate Array	python3
121	Best Time to Buy and Sell Stock	python3
122	Best Time to Buy and Sell Stock II	python3
55	Jump Game	python3
45	Jump Game II	python3
274	H-Index	python3
380	Insert Delete GetRandom O(1)	python3
238	Product of Array Except Self	python3
134	Gas Station	python3
135	Candy	python3
42	Trapping Rain Water	python3
13	Roman to Integer	python3
12	Integer to Roman	python3
58	Length of Last Word	python3
14	Longest Common Prefix	python3
151	Reverse Words in a String	python3
6	Zigzag Conversion	python3
28	Find the Index of the First Occurrence in a String	python3
68	Text Justification	python3

Two Pointers

#	Problem	Solution
125	Valid Palindrome	python3
392	Is Subsequence	python3
167	Two Sum II - Input Array Is Sorted	python3
11	Container With Most Water	python3
15	3Sum	python3

Sliding Window

#	Problem	Solution

Matrix

#	Problem	Solution
36	Valid Sudoku	python3
54	Spiral Matrix	python3
48	Rotate Image	python3
73	Set Matrix Zeroes	python3
289	Game of Life	python3

Hashmap

#	Problem	Solution

Intervals

#	Problem	Solution

Stack

#	Problem	Solution

Linked List

#	Problem	Solution

Binary Tree General

#	Problem	Solution

Binary Tree BFS

#	Problem	Solution

Binary Search Tree

#	Problem	Solution

Graph General

#	Problem	Solution

Graph BFS

#	Problem	Solution

Backtracking

#	Problem	Solution

Divide & Conquer

#	Problem	Solution

Kadane's Algorithm

#	Problem	Solution

Binary Search

#	Problem	Solution

Heap

#	Problem	Solution

Bit Manipulation

#	Problem	Solution

Math

#	Problem	Solution

1D DP

#	Problem	Solution

Multidimensional DP

#	Problem	Solution