You can find my solutions for the most 50 common LeetCode problems, which I used to practice a while ago.

I believe that's a cool idea to share my experience and such materials here for those who are practicing coding interview.

Hope you find it useful :)

list of problems:

#	LeetCode ID	Title	Level	URL
0	160	Intersection of Two Linked Lists	Easy	https://leetcode.com/problems/intersection-of-two-linked-lists/
1	350	Intersection of Two Arrays II	Easy	https://leetcode.com/problems/intersection-of-two-arrays-ii/
2	141	Linked List Cycle	Easy	https://leetcode.com/problems/linked-list-cycle/
3	217	Contains Duplicate	Easy	https://leetcode.com/problems/contains-duplicate/
4	387	First Unique Character in a String	Easy	https://leetcode.com/problems/first-unique-character-in-a-string/
5	121	Best Time to Buy and Sell Stock	Easy	https://leetcode.com/problems/best-time-to-buy-and-sell-stock/
6	235	Lowest Common Ancestor of a Binary Search Tree	Easy	https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/
7	237	Delete Node in a Linked List	Easy	https://leetcode.com/problems/delete-node-in-a-linked-list/
8	20	Valid Parentheses	Easy	https://leetcode.com/problems/valid-parentheses/
9	283	Move Zeroes	Easy	https://leetcode.com/problems/move-zeroes/
10	70	Climbing Stairs	Easy	https://leetcode.com/problems/climbing-stairs/
11	268	Missing Number	Easy	https://leetcode.com/problems/missing-number/
12	122	Best Time to Buy and Sell Stock II	Easy	https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/
13	108	Convert a Sorted Array to a BST	Easy	https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/
14	191	Number of 1 Bits	Easy	https://leetcode.com/problems/number-of-1-bits/
15	169	Majority Element	Easy	https://leetcode.com/problems/majority-element/
16	101	Symmetric Tree	Easy	https://leetcode.com/problems/symmetric-tree/
17	412	Fizz Buzz	Easy	https://leetcode.com/problems/fizz-buzz/
18	189	Rotate Array	Easy	https://leetcode.com/problems/rotate-array/
19	543	Diameter of Binary Tree	Easy	https://leetcode.com/problems/diameter-of-binary-tree/
20	242	Valid Anagram	Easy	https://leetcode.com/problems/valid-anagram/
21	234	Palindrome Linked List	Easy	https://leetcode.com/problems/palindrome-linked-list/
22	145	Binary tree Postorder Traversal	Hard	https://leetcode.com/problems/binary-tree-postorder-traversal/
23	79	Word search	Medium	https://leetcode.com/problems/word-search/
24	102	Binary Tree Level Order Traversal	Medium	https://leetcode.com/problems/binary-tree-level-order-traversal/
25	287	Find the Duplicate Number	Medium	https://leetcode.com/problems/find-the-duplicate-number/
26	215	Kth Largest Element in an Array	Medium	https://leetcode.com/problems/kth-largest-element-in-an-array/
27	179	Largest Number	Medium	https://leetcode.com/problems/largest-number/
28	378	Kth Smallest Element in a Sorted Matrix	Medium	https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/
29	200	Number of Islands	Medium	https://leetcode.com/problems/number-of-islands/
30	11	Container With Most Water	Medium	https://leetcode.com/problems/container-with-most-water/
31	236	Lowest Common Ancestor of a Binary Tree	Medium	https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree/
32	240	Search a 2D Matrix II	Medium	https://leetcode.com/problems/search-a-2d-matrix-ii/
33	347	Top K Frequent Elements	Medium	https://leetcode.com/problems/top-k-frequent-elements/
34	230	Kth Smallest Element in a BST	Medium	https://leetcode.com/problems/kth-smallest-element-in-a-bst/
35	2	Add Two Numbers	Medium	https://leetcode.com/problems/add-two-numbers/
36	48	Rotate Image	Medium	https://leetcode.com/problems/rotate-image/
37	152	Maximum Product Subarray	Medium	https://leetcode.com/problems/maximum-product-subarray/
38	454	4Sum II	Medium	https://leetcode.com/problems/4sum-ii/
39	56	Merge Intervals	Medium	https://leetcode.com/problems/merge-intervals/
40	73	Set matrix zero	Medium	https://leetcode.com/problems/set-matrix-zeroes/
41	238	Product of Array Except Self	Medium	https://leetcode.com/problems/product-of-array-except-self/
42	94	Binary Tree Inorder Traversal	Medium	https://leetcode.com/problems/binary-tree-inorder-traversal/
43	49	Group Anagrams	Medium	https://leetcode.com/problems/group-anagrams/
44	144	Binary Tree Preorder Traversal	Medium	https://leetcode.com/problems/binary-tree-preorder-traversal/
45	22	Generate Parentheses	Medium	https://leetcode.com/problems/generate-parentheses/
46	150	Evaluate Reverse Polish Notation	Medium	https://leetcode.com/problems/evaluate-reverse-polish-notation/
47	62	Unique Paths	Medium	https://leetcode.com/problems/unique-paths/
48	322	Coin Change	Medium	https://leetcode.com/problems/coin-change/
49	15	3Sum	Medium	https://leetcode.com/problems/3sum/