LeetCode solutions for CompCode

Arrays & Strings

LeetCode ID	Problem Name	Solutions	Video
2239	Find Closest Number to Zero	✔️ ✔️	✔️
1768	Merge Strings Alternately	✔️	✔️
13	Roman to Integer	✔️	✔️
14	Longest Common Prefix	✔️	✔️
228	Summary Ranges	✔️	✔️
238	Product of Array Except Self	✔️	✔️

Hashmaps & Sets

LeetCode ID	Problem Name	Solutions	Video
1	Two Sum	✔️ ✔️	✔️
136	Single Number	✔️ ✔️ ✔️ ✔️	✔️
347	Top K Frequent Elements	✔️ ✔️ ✔️	✔️
349	Intersection of Two Arrays	✔️ ✔️ ✔️	✔️
242	Valid Anagram	✔️ ✔️ ✔️ ✔️	✔️
205	Isomorphic Strings	✔️	✔️
36	Valid Sudoku	✔️ ✔️ ✔️	✔️
217	Contains Duplicate	✔️ ✔️ ✔️ ✔️ ✔️ ✔️	✔️

Two Pointers

LeetCode ID	Problem Name	Solutions	Video
167	Two Sum II - Input Array Is Sorted	✔️	✔️
125	Valid Palindrome	✔️	✔️
344	Reverse String	✔️ ✔️	✔️
121	Best Time to Buy and Sell Stock	✔️	✔️
11	Container With Most Water	✔️ ✔️	✔️
763	Partition Labels	✔️	✔️
88	Merge Sorted Array	✔️ ✔️	✔️
42	Trapping Rain Water	❌	❌

Stacks

LeetCode ID	Problem Name	Solutions	Video
682	Baseball Game	❌	❌
20	Valid Parentheses	✔️	✔️
155	Min Stack	❌	❌
739	Daily Temperatures	❌	❌
42	Trapping Rain Water	❌	❌

Linked Lists

LeetCode ID	Problem Name	Solutions	Video
206	Reverse Linked List	✔️ ✔️	✔️
141	Linked List Cycle	❌	❌
21	Merge Two Sorted Lists	❌	❌
19	Remove Nth Node From End of List	❌	❌
160	Intersection of Two Linked Lists	❌	❌
876	Middle of the Linked List	❌	❌
143	Reorder List	❌	❌
92	Reverse Linked List II	❌	❌
138	Copy List with Random Pointer	❌	❌
23	Merge k Sorted Lists	❌	❌
25	Reverse Nodes in k-Group	❌	❌
61	Rotate List	❌	❌
24	Swap Nodes in Pairs	❌	❌

Binary Search

LeetCode ID	Problem Name	Solutions	Video
704	Binary Search	✔️ ✔️	✔️
278	First Bad Version	❌	❌
35	Search Insert Position	❌	❌
374	Guess Number Higher or Lower	❌	❌
33	Search in Rotated Sorted Array	❌	❌
34	Find First and Last Position of Element in Sorted Array	❌	❌
852	Peak Index in a Mountain Array	❌	❌

Sliding Window

LeetCode ID	Problem Name	Solutions	Video
209	Minimum Size Subarray Sum	✔️ ✔️	✔️
3	Longest Substring Without Repeating Characters	❌	❌
424	Longest Repeating Character Replacement	❌	❌
567	Permutation in String	❌	❌
76	Minimum Window Substring	❌	❌
1004	Max Consecutive Ones III	❌	❌
239	Sliding Window Maximum	❌	❌

Trees

LeetCode ID	Problem Name	Solutions	Video
104	Maximum Depth of Binary Tree	✔️ ✔️ ✔️	✔️
226	Invert Binary Tree	✔️ ✔️ ✔️ ✔️	✔️
110	Balanced Binary Tree	❌	❌
101	Symmetric Tree	❌	❌
543	Diameter of Binary Tree	❌	❌
94	Binary Tree Inorder Traversal	✔️ ✔️	✔️
700	Search in a Binary Search Tree	❌	❌
701	Insert into a Binary Search Tree	❌	❌
98	Validate Binary Search Tree	❌	❌
450	Delete Node in a BST	❌	❌
235	Lowest Common Ancestor of a Binary Search Tree	❌	❌
530	Minimum Absolute Difference in BST	❌	❌
199	Binary Tree Right Side View	❌	❌
102	Binary Tree Level Order Traversal	❌	❌

Tries

LeetCode ID	Problem Name	Solutions	Video
208	Implement Trie (Prefix Tree)	✔️	✔️
211	Design Add and Search Words Data Structure	❌	❌

Heaps

LeetCode ID	Problem Name	Solutions	Video
215	Kth Largest Element in an Array	❌	❌
973	K Closest Points to Origin	❌	❌
703	Kth Largest Element in a Stream	❌	❌
295	Find Median from Data Stream	❌	❌
1046	Last Stone Weight	✔️ ✔️ ✔️	✔️

Intervals

LeetCode ID	Problem Name	Solutions	Video
56	Merge Intervals	✔️	✔️
57	Insert Interval	❌	❌
435	Non-overlapping Intervals	❌	❌
252	Meeting Rooms	❌	❌
253	Meeting Rooms II	❌	❌

Backtracking

LeetCode ID	Problem Name	Solutions	Video
46	Permutations	❌	❌
78	Subsets	✔️ ✔️	✔️
90	Subsets II	❌	❌
77	Combinations	❌	❌
22	Generate Parentheses	❌	❌
39	Combination Sum	❌	❌
40	Combination Sum II	❌	❌

Graphs

LeetCode ID	Problem Name	Solutions	Video
200	Number of Islands	✔️ ✔️	✔️
547	Number of Provinces	❌	❌
695	Max Area of Island	❌	❌
1020	Number of Enclaves	❌	❌
133	Clone Graph	❌	❌
994	Rotting Oranges	❌	❌
797	All Paths From Source to Target	❌	❌
207	Course Schedule	❌	❌
323	Number of Connected Components in an Undirected Graph	❌	❌
684	Redundant Connection	❌	❌

Dynamic Programming

LeetCode ID	Problem Name	Solutions	Video
70	Climbing Stairs	✔️ ✔️ ✔️ ✔️	✔️
746	Min Cost Climbing Stairs	❌	❌
198	House Robber	❌	❌
213	House Robber II	❌	❌
62	Unique Paths	❌	❌
63	Unique Paths II	❌	❌
5	Longest Palindromic Substring	❌	❌
300	Longest Increasing Subsequence	❌	❌
1143	Longest Common Subsequence	❌	❌
152	Maximum Product Subarray	❌	❌

Bit Manipulation

LeetCode ID	Problem Name	Solutions	Video
136	Single Number	✔️ ✔️ ✔️ ✔️	✔️
191	Number of 1 Bits	✔️ ✔️	❌
231	Power of Two	❌	❌
338	Counting Bits	❌	❌
268	Missing Number	❌	❌
371	Sum of Two Integers	❌	❌
260	Single Number III	❌	❌
421	Maximum XOR of Two Numbers in an Array	❌	❌

Greedy

LeetCode ID	Problem Name	Solutions	Video
53	Maximum Subarray	✔️ ✔️	✔️
55	Jump Game	❌	❌
134	Gas Station	❌	❌
846	Hand of Straights	❌	❌
1899	Merge Triplets to Form Target Triplet	❌	❌
678	Valid Parenthesis String	❌	❌

Math

LeetCode ID	Problem Name	Solutions	Video
202	Happy Number	❌	❌
66	Plus One	❌	❌
50	Pow(x, n)	❌	❌
48	Rotate Image	✔️	✔️
54	Spiral Matrix	❌	❌
73	Set Matrix Zeroes	❌	❌