LeetCode

Collection of LeetCode questions to ace the coding interview!

Table of Contents

#	Title	Solution	Difficulty
1	Two Sum	Python, Rust	Easy
2	Add Two Numbers	Python, Rust	Medium
3	Longest Substring Without Repeating Characters	Rust	Medium
4	Median of Two Sorted Arrays	Rust	Hard
5	Longest Palindromic Substring	Rust	Medium
6	Zigzag Conversion	Rust	Medium
7	Reverse Integer	Rust	Medium
8	String to Integer (atoi)	Rust	Medium
9	Palindrome Number	Rust	Easy
10	Regular Expression Matching	Python	Hard
11	Container With Most Water	Rust	Medium
12	Integer to Roman	Rust	Medium
13	Roman to Integer	Rust	Easy
14	Longest Common Prefix	Rust	Easy
15	3Sum	Rust	Medium
16	3Sum Closest	Rust	Medium
17	Letter Combinations of a Phone Number	Python	Medium
18	4Sum	Python	Medium
19	Remove Nth Node From End of List	Python	Medium
20	Valid Parentheses	Rust	Easy
21	Merge Two Sorted Lists	Rust	Easy
22	Generate Parentheses	Python	Medium
23	Merge k Sorted Lists	Python	Hard
24	Swap Nodes in Pairs	Python	Medium
25	Reverse Nodes in k-Group	Python	Hard
26	Remove Duplicates from Sorted Array	Rust	Easy
27	Remove Element	Rust	Easy
28	Find the Index of the First Occurrence in a String	Rust	Easy
29	Divide Two Integers	Python	Medium
30	Substring with Concatenation of All Words	Python	Hard
31	Next Permutation	Python	Medium
32	Longest Valid Parentheses	Python	Hard
33	Search in Rotated Sorted Array	Python	Medium
34	Find First and Last Position of Element in Sorted Array	Python	Medium
35	Search Insert Position	Rust	Easy
36	Valid Sudoku	Rust	Medium
37	Sudoku Solver	Python	Hard
38	Count and Say	Python	Medium
39	Combination Sum	Python	Medium
40	Combination Sum II	Python	Medium
41	First Missing Positive	Python	Hard
42	Trapping Rain Water	Python	Hard
43	Multiply Strings	Python	Medium
44	Wildcard Matching	Python	Hard
45	Jump Game II	Rust	Medium
46	Permutations	Python	Medium
47	Permutations II	Python	Medium
48	Rotate Image	Python	Medium
49	Group Anagrams	Python	Medium
50	Pow(x, n)	Python	Medium
51	N-Queens	Python	Hard
52	N-Queens II	Python	Hard
53	Maximum Subarray	Rust	Medium
54	Spiral Matrix	Python	Medium
55	Jump Game	Python	Medium
56	Merge Intervals	Python	Medium
57	Insert Interval	Python	Medium
58	Length of Last Word	Rust	Easy
59	Spiral Matrix II	Python	Medium
60	Permutation Sequence	Python	Hard
61	Rotate List	Python	Medium
62	Unique Paths	Python	Medium
65	Valid Number	Python	Hard
66	Plus One	Rust	Easy
67	Add Binary	Rust	Easy
68	Text Justification	Python	Hard
69	Sqrt(x)	Rust	Easy
70	Climbing Stairs	Rust	Easy
71	Simplify Path	Python	Medium
72	Edit Distance	Python	Medium
73	Set Matrix Zeroes	Python	Medium
79	Word Search	Python	Medium
80	Remove Duplicates from Sorted Array II	Rust	Medium
81	Search in Rotated Sorted Array II	Python	Medium
82	Remove Duplicates from Sorted List II	Python	Medium
83	Remove Duplicates from Sorted List	Rust	Easy
86	Partition List	Python	Medium
88	Merge Sorted Array	Rust	Easy
89	Gray Code	Python	Medium
90	Subsets II	Python	Medium
91	Decode Ways	Python	Medium
92	Reverse Linked List II	Python	Medium
93	Restore IP Addresses	Python	Medium
94	Binary Tree Inorder Traversal	Rust	Easy
95	Unique Binary Search Trees II	Python	Medium
96	Unique Binary Search Trees	Python	Medium
97	Interleaving String	Python	Medium
98	Validate Binary Search Tree	Python	Medium
99	Recover Binary Search Tree	Python	Medium
100	Same Tree	Python	Easy
101	Symmetric Tree	Python	Easy
102	Binary Tree Level Order Traversal	Python	Medium
104	Maximum Depth of Binary Tree	Python	Easy
108	Convert Sorted Array to Binary Search Tree	Python	Easy
109	Convert Sorted List to Binary Search Tree	Python	Medium
110	Balanced Binary Tree	Python	Easy
111	Minimum Depth of Binary Tree	Python	Easy
112	Path Sum	Python	Easy
118	Pascal's Triangle	Python	Easy
119	Pascal's Triangle II	Rust	Easy
121	Best Time to Buy and Sell Stock	Python	Easy
125	Valid Palindrome	Python	Easy
136	Single Number	Python	Easy
137	Single Number II	Python	Medium
141	Linked List Cycle	Python	Easy
142	Linked List Cycle II	Python	Medium
144	Binary Tree Preorder Traversal	Python	Easy
145	Binary Tree Postorder Traversal	Python	Easy
146	LRU Cache	Python	Medium
148	Sort List	Python	Medium
149	Max Points on a Line	Python	Hard
150	Evaluate Reverse Polish Notation	Python	Medium
160	Intersection of Two Linked Lists	Python	Easy
168	Excel Sheet Column Title	Python	Easy
169	Majority Element	Rust	Easy
171	Excel Sheet Column Number	Python	Easy
176	Second Highest Salary	SQL	Medium
177	Nth Highest Salary	SQL	Medium
178	Rank Scores	SQL	Medium
180	Consecutive Numbers	SQL	Medium
182	Duplicate Emails	SQL	Easy
183	Customers Who Never Order	SQL	Easy
184	Department Highest Salary	SQL	Medium
185	Department Top Three Salaries	SQL	Hard
191	Number of 1 Bits	Rust	Easy
196	Delete Duplicate Emails	SQL	Easy
197	Rising Temperature	SQL	Easy
210	Course Schedule II	Python	Medium
231	Power of Two	Rust	Easy
238	Product of Array Except Self	Rust	Medium
262	Trips and Users	SQL	Hard
268	Missing Number	Rust	Easy
342	Power of Four	Rust	Easy
349	Intersection of Two Arrays	Rust	Easy
407	Trapping Rain Water II	Python	Hard
452	Minimum Number of Arrows to Burst Balloons	Rust	Medium
511	Game Play Analysis I	SQL	Easy
550	Game Play Analysis IV	SQL	Medium
570	Managers with at Least 5 Direct Reports	SQL	Medium
584	Find Customer Referee	SQL	Easy
586	Customer Placing the Largest Number of Orders	SQL	Easy
595	Big Countries	SQL	Easy
596	Classes More Than 5 Students		Easy
607	Sales Person	SQL	Easy
610	Triangle Judgement	SQL	Easy
619	Biggest Single Number	SQL	Easy
621	Task Scheduler	Rust	Medium
627	Swap Salary	SQL	Easy
746	Min Cost Climbing Stairs	Rust	Easy
791	Custom Sort String	Rust	Medium
827	Making A Large Island	Python	Hard
844	Backspace String Compare	Rust	Easy
876	Middle of the Linked List	Rust	Easy
930	Binary Subarrays With Sum	Rust	Medium
977	Squares of a Sorted Array	Rust	Easy
1050	Actors and Directors Who Cooperated At Least Three Times	SQL	Easy
1068	Product Sales Analysis I	SQL	Easy
1075	Project Employees I	SQL	Easy
1084	Sales Analysis III	SQL	Easy
1141	User Activity for the Past 30 Days I	SQL	Easy
1148	Article Views I	SQL	Easy
1171	Remove Zero Sum Consecutive Nodes from Linked List	Rust	Medium
1179	Reformat Department Table	SQL	Easy
1211	Queries Quality and Percentage	SQL	Easy
1251	Average Selling Price	SQL	Easy
1280	Students and Examinations	SQL	Easy
1327	List the Products Ordered in a Period	SQL	Easy
1356	Sort Integers by The Number of 1 Bits	Rust	Easy
1378	Replace Employee ID With The Unique Identifier	SQL	Easy
1407	Top Travellers	SQL	Easy
1484	Group Sold Products By The Date	SQL	Easy
1541	Top Travellers	SQL	Easy
1662	Check If Two String Arrays are Equivalent	Rust	Easy
1780	Check if Number is a Sum of Powers of Three	Python	Medium
2161	Partition Array According to Given Pivot	Python	Medium
2206	Divide Array Into Equal Pairs	Python	Easy
2373	Largest Local Values in a Matrix	Python	Easy
2379	Minimum Recolors to Get K Consecutive Black Blocks	Python	Easy
2485	Find the Pivot Integer	Rust	Easy
2523	Closest Prime Numbers in Range	Python	Medium
2540	Minimum Common Value	Rust	Easy
2570	Merge Two 2D Arrays by Summing Values	Python	Easy
2579	Count Total Number of Colored Cells	Python	Medium
2657	Find the Prefix Common Array of Two Arrays	Python	Medium
2864	Maximum Odd Binary Number	Rust	Easy
2965	Find Missing and Repeated Values	Python	Easy
3005	Count Elements With Maximum Frequency	Rust	Easy
3208	Alternating Groups II	Python	Medium
3235	Check if the Rectangle Corner Is Reachable	Python	Hard
3465	Find Products with Valid Serial Numbers	SQL	Easy