Algorithms and Data Structures
Structured interview-style practice with Python walkthroughs for arrays, strings, linked lists, trees, graphs, greedy methods, and dynamic programming.
Video Lessons
Interview-focused problem solving in Python
Structured interview-style practice with Python walkthroughs for arrays, strings, linked lists, trees, graphs, greedy methods, and dynamic programming.
Lesson 1
Two Sum - Leetcode 1 - Python
Lesson 1 in the playlist with a Python solution walkthrough.
Lesson 2
Longest Substring Without Repeating Characters - Leetcode 3 - Python
Lesson 2 in the playlist with a Python solution walkthrough.
Lesson 3
Longest Palindromic Substring - Leetcode 5 - Python
Lesson 3 in the playlist with a Python solution walkthrough.
Lesson 4
Container With Most Water - Leetcode 11 - Python
Lesson 4 in the playlist with a Python solution walkthrough.
Lesson 5
Triplet Sum - Leetcode 15 - Python
Lesson 5 in the playlist with a Python solution walkthrough.
Lesson 6
Remove Nth Node From End of List - Leetcode 19 - Python
Lesson 6 in the playlist with a Python solution walkthrough.
Lesson 7
Valid Parentheses - Leetcode 20 - Python
Lesson 7 in the playlist with a Python solution walkthrough.
Lesson 8
Merge Two Sorted Lists - Leetcode 21 - Python
Lesson 8 in the playlist with a Python solution walkthrough.
Lesson 9
Merge k Sorted Lists - Leetcode 23 - Python
Lesson 9 in the playlist with a Python solution walkthrough.
Lesson 10
Search in Rotated Sorted Array - Leetcode 33 - Python
Lesson 10 in the playlist with a Python solution walkthrough.
Lesson 11
Combination Sum - Leetcode 39 - Python
Lesson 11 in the playlist with a Python solution walkthrough.
Lesson 12
Rotate Image - Leetcode 48 - Python
Lesson 12 in the playlist with a Python solution walkthrough.
Lesson 13
Group Anagrams - Leetcode 49 - Python
Lesson 13 in the playlist with a Python solution walkthrough.
Lesson 14
Maximum Subarray - Leetcode 53 - Python
Lesson 14 in the playlist with a Python solution walkthrough.
Lesson 15
Spiral Matrix - Leetcode 54 - Python
Lesson 15 in the playlist with a Python solution walkthrough.
Lesson 16
Jump Game - Leetcode 55 - Python
Lesson 16 in the playlist with a Python solution walkthrough.
Lesson 17
Merge Intervals - Leetcode 56 - Python
Lesson 17 in the playlist with a Python solution walkthrough.
Lesson 18
Insert Interval - Leetcode 57 - Python
Lesson 18 in the playlist with a Python solution walkthrough.
Lesson 19
Unique Paths - Leetcode 62 - Python
Lesson 19 in the playlist with a Python solution walkthrough.
Lesson 20
Climbing Stairs - Leetcode 70 - Python
Lesson 20 in the playlist with a Python solution walkthrough.
Lesson 21
Set Matrix Zeroes - Leetcode 73 - Python
Lesson 21 in the playlist with a Python solution walkthrough.
Lesson 22
Minimum Window Substring - Leetcode 76 - Python
Lesson 22 in the playlist with a Python solution walkthrough.
Lesson 23
Word Search - Leetcode 79 - Python
Lesson 23 in the playlist with a Python solution walkthrough.
Lesson 24
Decode Ways - Leetcode 91 - Python
Lesson 24 in the playlist with a Python solution walkthrough.
Lesson 25
Validate Binary Search Tree - Leetcode 98 - Python
Lesson 25 in the playlist with a Python solution walkthrough.
Lesson 26
Same Tree - Leetcode 100 - Python
Lesson 26 in the playlist with a Python solution walkthrough.
Lesson 27
Binary Tree Level Order Traversal - Leetcode 102 - Python
Lesson 27 in the playlist with a Python solution walkthrough.
Lesson 28
Maximum Depth of Binary Tree - Leetcode 104 - Python
Lesson 28 in the playlist with a Python solution walkthrough.
Lesson 29
Construct Binary Tree from Preorder and Inorder Traversal - Leetcode 105 - Python
Lesson 29 in the playlist with a Python solution walkthrough.
Lesson 30
Best Time to Buy and Sell - Leetcode 121 - Python
Lesson 30 in the playlist with a Python solution walkthrough.
Lesson 31
Binary Tree Maximum Path Sum - Leetcode 124 - Python
Lesson 31 in the playlist with a Python solution walkthrough.
Lesson 32
Valid Palindrome - Leetcode 125 - Python
Lesson 32 in the playlist with a Python solution walkthrough.
Lesson 33
Longest Consecutive Sequence - Leetcode 128 - Python
Lesson 33 in the playlist with a Python solution walkthrough.
Lesson 34
Clone Graph - Leetcode 133 - Python
Lesson 34 in the playlist with a Python solution walkthrough.
Lesson 35
Word Break - Leetcode 139 - Python
Lesson 35 in the playlist with a Python solution walkthrough.
Lesson 36
Linked List Cycle - Leetcode 141 - Python
Lesson 36 in the playlist with a Python solution walkthrough.
Lesson 37
Reorder List - Leetcode 143 - Python
Lesson 37 in the playlist with a Python solution walkthrough.
Lesson 38
Maximum Product Subarray - Leetcode 152 - Python
Lesson 38 in the playlist with a Python solution walkthrough.
Lesson 39
Find Minimum in Rotated Sorted Array - Leetcode 153 - Python
Lesson 39 in the playlist with a Python solution walkthrough.
Lesson 40
Reverse Bits - Leetcode 190 - Python
Lesson 40 in the playlist with a Python solution walkthrough.
Lesson 41
Number of 1 Bits - Leetcode 191 - Python
Lesson 41 in the playlist with a Python solution walkthrough.
Lesson 42
House Robber - Leetcode 198 - Python
Lesson 42 in the playlist with a Python solution walkthrough.
Lesson 43
Number of Islands - Leetcode 200 - Python
Lesson 43 in the playlist with a Python solution walkthrough.
Lesson 44
Reverse Linked List - Leetcode 206 - Python
Lesson 44 in the playlist with a Python solution walkthrough.
Lesson 45
Course Schedule - Leetcode 207 - Python
Lesson 45 in the playlist with a Python solution walkthrough.
Lesson 46
Implement Trie (Prefix Tree) - Leetcode 208 - Python
Lesson 46 in the playlist with a Python solution walkthrough.
Lesson 47
Course Schedule II - Leetcode 210 - Python
Lesson 47 in the playlist with a Python solution walkthrough.
Lesson 48
Design Add and Search Words Data Structure - Leetcode 211 - Python
Lesson 48 in the playlist with a Python solution walkthrough.
Lesson 49
Word Search II - Leetcode 212 - Python
Lesson 49 in the playlist with a Python solution walkthrough.
Lesson 50
House Robber II - Leetcode 213 - Python
Lesson 50 in the playlist with a Python solution walkthrough.
Lesson 51
Contains Duplicate - Leetcode 217 - Python
Lesson 51 in the playlist with a Python solution walkthrough.
Lesson 52
Invert Binary Tree - Leetcode 226 - Python
Lesson 52 in the playlist with a Python solution walkthrough.
Lesson 53
Kth Smallest Element in a BST - Leetcode 230 - Python
Lesson 53 in the playlist with a Python solution walkthrough.
Lesson 54
Lowest Common Ancestor of a Binary Search Tree - Leetcode 235 - Python
Lesson 54 in the playlist with a Python solution walkthrough.
Lesson 55
Product of Array Except Self - Leetcode 238 - Python
Lesson 55 in the playlist with a Python solution walkthrough.
Lesson 56
Valid Anagram - Leetcode 242 - Python
Lesson 56 in the playlist with a Python solution walkthrough.
Lesson 57
Missing Number - Leetcode 268 - Python
Lesson 57 in the playlist with a Python solution walkthrough.
Lesson 58
Find Median from Data Stream - Leetcode 295 - Python
Lesson 58 in the playlist with a Python solution walkthrough.
Lesson 59
Serialize and Deserialize Binary Tree - Leetcode 297 - Python
Lesson 59 in the playlist with a Python solution walkthrough.
Lesson 60
Longest Increasing Subsequence - Leetcode 300 - Python
Lesson 60 in the playlist with a Python solution walkthrough.
Lesson 61
Coin Change - Leetcode 322 - Python
Lesson 61 in the playlist with a Python solution walkthrough.
Lesson 62
Counting Bits - Leetcode 338 - Python
Lesson 62 in the playlist with a Python solution walkthrough.
Lesson 63
Top K Frequent Elements - Leetcode 347 - Python
Lesson 63 in the playlist with a Python solution walkthrough.
Lesson 64
Sum of Two Integers - Leetcode 371 - Python
Lesson 64 in the playlist with a Python solution walkthrough.
Lesson 65
Pacific Atlantic Water Flow - Leetcode 417 - Python
Lesson 65 in the playlist with a Python solution walkthrough.
Lesson 66
Longest Repeating Character Replacement - Leetcode 424 - Python
Lesson 66 in the playlist with a Python solution walkthrough.
Lesson 67
Non-overlapping Intervals - Leetcode 435 - Python
Lesson 67 in the playlist with a Python solution walkthrough.
Lesson 68
Subtree of Another Tree - Leetcode 572 - Python
Lesson 68 in the playlist with a Python solution walkthrough.
Lesson 69
Can Place Flowers - Leetcode 605 - Python
Lesson 69 in the playlist with a Python solution walkthrough.
Lesson 70
Maximum Length Of Pair Chain - Leetcode 646 - Python
Lesson 70 in the playlist with a Python solution walkthrough.
Lesson 71
Palindromic Substrings - Leetcode 647 - Python
Lesson 71 in the playlist with a Python solution walkthrough.
Lesson 72
Shortest Path Visiting All Nodes - Leetcode 847 - Python
Lesson 72 in the playlist with a Python solution walkthrough.
Lesson 73
Maximize Distance to Closest Person - Leetcode 849 - Python
Lesson 73 in the playlist with a Python solution walkthrough.
Lesson 74
Partition Array for Maximum Sum - Leetcode 1043 - Python
Lesson 74 in the playlist with a Python solution walkthrough.
Lesson 75
Longest Common Subsequence - Leetcode 1143 - Python
Lesson 75 in the playlist with a Python solution walkthrough.
Lesson 76
Largest Color Value in a Directed Graph - Leetcode 1857 - Python
Lesson 76 in the playlist with a Python solution walkthrough.