LeetCode Problem Solutions

Note

This website contains my LeetCode problem solving records, problems are categorized by difficulty:

• Easy - Easy difficulty problems
• Medium - Medium difficulty problems
• Hard - Hard difficulty problems

Solution Table

Number	Title	Solution	Difficulty
1	Two Sum	go	E
2	Add Two Numbers	go	M
3	Longest Substring Without Repeating Characters	go	M
4	Median of Two Sorted Arrays	go	H
5	Longest Palindromic Substring	go	M
6	Zigzag Conversion	go	M
7	Reverse Integer	go	M
8	String to Integer (atoi)	go	M
9	Palindrome Number	go	E
10	Regular Expression Matching	go	H
11	Container With Most Water	go	M
12	Integer to Roman	go	M
13	Roman to Integer	go	E
14	Longest Common Prefix	go	E
15	3Sum	go	M
16	3Sum Closest	go	M
17	Letter Combinations of a Phone Number	go	M
23	Merge k Sorted Lists	go	H
24	Swap Nodes in Pairs	go	M
25	Reverse Nodes in k-Group	go	H
38	Count and Say	go	M
42	Trapping Rain Water	go	H
44	Wildcard Matching	go	H
45	Jump Game II	go	M
46	Permutations	go	M
50	Pow(x, n)	go	M
51	N-Queens	go	H
73	Set Matrix Zeroes	go	M
105	Construct Binary Tree from Preorder and Inorder Tranversal	go	M
124	Binary Tree Maximum Path Sum	go	H
135	Candy	go	H
140	Word Break II	go	H
146	LRU Cache	go	M
210	Course Schedule II	go	M
220	Contains Duplicate III	go	H
236	Lowest Common Ancestor of a Binary Tree	go	M
239	Sliding Window Maximum	go	H
312	Burst Balloons	go	H
316	Remove Duplicate Letters	go	M
322	Coin Change	go	M
347	Top K Frequent Elements	go	M
386	Lexicographical Numbers	go	M
416	Partition Equal Subset Sum	go	M
435	Non-overlapping Interval	go	M
440	K-th Smallest in Lexicographical Order	go	H
460	LFU Cache	go	H
592	Fraction Addition and Subtraction	go	M
594	Longest Harmonious Subsequence	go	E
685	Redundant Connection II	go	H
752	Open the Lock	go	M
757	Set Intersection Size At Least Two	go	H
765	Couples Holding Hands	go	H
815	Bus Routes	go	H
834	Sum of Distances in Tree	go	H
840	Magic Squares In Grid	go	M
847	Shortest Path Visiting All Nodes	go	H
855	Exam Room	go	M
875	Koko Eating Bananas	go	M
881	Boats to Save People	go	M
887	Super Egg Drop	go	H
895	Maximum Frequency Stack	go	H
912	Sort an Array	go	M
948	Bag of Tokens	go	M
1209	Remove All Adjacent Duplicates in String II	go	M
1395	Count Number of Trams	go	M
2016	Maximum Difference Between Increasing Elements	go	E
2071	Maximum Number of Tasks You Can Assign	go	H
2099	Find Subsequence of Length K With the Largest Sum	go	E
2138	Divide a String Into Groups of Size k	go	E
2294	Partition Array Such That Maximum Difference Is K	go	M
2366	Mimimum Replacements to Sort the Array	go	H
2392	Build A Matrix with Conditions	go	H
2444	Count Subarrays With Fixed Bounds	go	H
2742	Paiting the Walls	go	H
2894	Divisible and Non-divisible Sums Difference	go	E
2966	Divide Array Into Arrays With Max Difference	go	M
3024	Type of Triangle	go	E
3355	Zero Array Transformation I	go	M
3362	Zero Array Transformation III	go	M
3372	Maximize the Number of Target Nodes After Connecting Trees I	go	M
3373	Maximize the Number of Target Nodes After Connecting Trees II	go	H
3423	Maximum Difference Between Adjacent Elements in a Circular Array	go	E
3442	Maximum Difference Between Even and Odd Frequency I	go	E
3443	Maximum Manhattan Distance After K Changes	go	M
3727	Find the Count of Good Integers	go	H

About

This website is built with MkDocs and hosted on GitHub Pages. All solution code can be found in the Repository: alonza0314/leetcode.