LeetCode In Python: 50 Algorithms Coding Interview Questions

19h 36m 13s
English
Paid
September 12, 2024

In this course, you'll have a detailed, step by step explanation of 50 hand-picked LeetCode questions where you'll learn about the most popular techniques and problems used in the coding interview, This is the course I wish I had when I was doing my interviews.

More
  • Getting ready for your software engineering coding interview? This is the place for you.

  • Want to learn about the most popular techniques, patterns, data structures and algorithms used in those difficult interviews? This is the place for you.

  • Want a step by step explanation of 50 of the most popular interview questions in the industry? This is the place for you.

What is LeetCode?

LeetCode is essentially a huge repository of real interview questions asked by the most popular tech companies ( Google, Amazon, Facebook, Microsoft and more ).

The problem with LeetCode is also its advantage, IT'S HUGE, so huge in fact that interviewers from the most popular companies often directly ask questions they find on LeetCode, So it's hard to navigate through the huge amount of problems to find those that really matter, this is what this course is for.

I spent countless hours on LeetCode and I'm telling you that you don't have to do the same and still be able to get a job at a major tech company.

In this course, I compiled 50 of the most important and the most popular interview questions asked by these major companies and I explain them, in a true STEP BY STEP fashion to help you understand exactly how to solve these types of questions.

The problems are handpicked to ensure complete coverage of the most popular techniques, data structures, and algorithms used in interviews so you can generalize the patterns you learn here on other problems.

Each problem gets 2 videos :

  • Explanation video: we do a detailed explanation of the problems and its solution, this video will be longer because we will do a step by step explanation for the problems.

  • Coding video: where we code the solution discussed in the explanation video together.
    We will use basic python for this course to code our solutions, previous knowledge in python is preferred but NOT required for the coding part of the course. The problems are categorized for easier navigation and will be regularly updated with more popular and interesting problems.

Some of the stuff this course will cover are :

  • Arrays and Strings.

  • Searching.

  • Dynamic Programming.

  • Backtracking (  With step by step visualization ).

  • Trees and Graphs.

  • Data structures Like Stacks, Queues, Maps, Linked Lists, and more.

Requirements:
  • Basic Knowledge of Fundamental data structures and algorithms is preferred
  • Basic Knowledge of python is prefered

Who this course is for:

  • Developers eager to pass the coding interview at huge companies like Google, Facebook, Microsoft, Amazon, etc.
  • People who want to develop their problem solving skills.
  • Developers getting ready for their interviews.
  • Students getting ready for their internship interviews.

What you'll learn:

  • How to solve some of the most popular interview questions asked by major tech companies
  • Popular problems patterns
  • Breaking down the coding interview problems
  • Algorithms and Data structures
  • Arrays, Stacks, Queues, Maps and Linked Lists
  • Dynamic Programming
  • Backtracking
  • Search techniques
  • Math techniques
  • Trees and Graphs

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# Title Duration
1 Introduction 01:36
2 How to use this course 01:56
3 Big O Introduction 04:24
4 Big O Exercises 06:17
5 Formalizing Big O 09:20
6 Big O Simplification 05:33
7 Space complexity 04:51
8 Logarithms 06:30
9 Binary Search Algorithm 08:05
10 Binary Search Implementation 05:46
11 Sliding Window Technique 10:29
12 Sliding Window Implementation 05:04
13 Explanation - Move Zeroes - Easy #283 09:09
14 Code - Move Zeroes - Easy #283 02:29
15 [Custom Input - NEW] - Move Zeroes 02:34
16 Explanation - Boats to Save People - Medium #881 11:59
17 Code - Boats to Save People - Medium #881 03:59
18 [Custom Input - NEW] - Boats to save people 05:40
19 Explanation - Valid Mountain Array - Easy #941 10:21
20 Code - Valid Mountain Array - Easy #941 03:50
21 [Custom Input - NEW] - Valid Mountain Array 02:33
22 Explanation - Container With Most Water - Medium #11 11:40
23 Code - Container With Most Water - Medium #11 05:00
24 [Custom Input - NEW] - Container with most water 04:30
25 Explanation - Longest Substring Without Repeating Characters - Medium #3 12:01
26 Code - Longest Substring Without Repeating Characters - Medium #3 02:51
27 [Custom Input - NEW] - Longest Substring Without repeating characters 01:39
28 Explanation - Find First and Last Position of Element in Sorted Array-Medium #34 17:35
29 Code - Find First and Last Position of Element in Sorted Array - Medium #34 09:24
30 [Custom Input - NEW] - Find first and last position of element in sorted array 03:03
31 Explanation - First Bad Version - Easy #278 07:26
32 Code - First Bad Version - Easy #278 03:34
33 [Custom Input - NEW] - First Bad Version - Easy #278 05:55
34 Explanation - Missing Number - Easy #268 08:38
35 Code - Missing Number - Easy #268 01:48
36 [Custom Input - NEW] - Missing Number - Easy #268 01:34
37 Explanation - Count Primes - Easy #204 05:00
38 Code - Count Primes - Easy #204 03:44
39 [Custom Input - NEW] - Count Primes - Easy #204 01:29
40 Explanation - Single Number - Easy #136 05:05
41 Code - Single Number - Easy #136 00:55
42 [Custom Input - NEW] - Single Number - Easy#136 01:00
43 Explanation - Robot Return to Origin - Easy #657 03:08
44 Code - Robot Return to Origin - Easy #657 01:54
45 [Custom Input - NEW] - Robot Return to Origin - Easy #657 02:03
46 Explanation - Add Binary - Easy #67 06:14
47 Code - Add Binary - Easy #67 05:19
48 [Custom Input - NEW] - Add Binary - Easy #67 02:24
49 What are hash tables ? 05:33
50 Collision handling 07:06
51 Collision handling techniques comparison 03:48
52 Explanation - Two Sum - Easy #1 06:51
53 Code - Two Sum - Easy #1 02:26
54 [Custom Input] - Two Sum - Easy #1 02:13
55 Explanation - Contains Duplicate - Easy #217 05:00
56 Code - Contains Duplicate - Easy #217 02:06
57 [Custom Input] - Contains Duplicate - Easy #217 01:43
58 Explanation - Majority Element - Easy #169 03:41
59 Code - Majority Element - Easy #169 01:54
60 [Custom Input] - Majority Element - Easy #169 03:23
61 Explanation - Group Anagrams - Medium #49 06:06
62 Code - Group Anagrams - Medium #49 03:44
63 [Custom Input] - Group Anagrams - Medium #49 03:16
64 Explanation - 4Sum II - Medium #454 09:03
65 Code - 4Sum II - Medium #454 04:36
66 [Custom Input] - 4Sum II - Medium #454 05:47
67 Explanation - LRU Cache - Medium #146 14:35
68 Code - LRU Cache - Medium #146 04:49
69 [Custom Input] - LRU Cache - Medium #146 04:10
70 Explanation - Minimum Window Substring - Hard #76 20:09
71 Code - Minimum Window Substring - Hard #76 10:20
72 What are Linked Lists ? 07:30
73 Singly linked list creation implementation 05:02
74 Singly linked list insertion implementation 07:32
75 Singly linked list deletion implementation 04:29
76 Doubly Linked Lists 02:59
77 Doubly linked lists creation implementation 08:45
78 Doubly linked lists insertion implementation 10:23
79 Doubly linked list deletion implementation 08:47
80 Explanation - Merge Two Sorted Lists - Easy #21 07:11
81 Code - Merge Two Sorted Lists - Easy #21 05:22
82 [Custom Input - NEW] - Merge Two Sorted Lists - Easy #21 06:02
83 Explanation - Linked List Cycle - Easy #141 04:51
84 Code - Linked List Cycle - Easy #141 01:55
85 [Custom Input - NEW] - Linked List Cycle - Easy #141 04:41
86 Explanation - Reverse Linked List - Easy #206 08:30
87 Code - Reverse Linked List - Easy #206 02:10
88 [Custom Input - NEW] - Reverse Linked List - Easy #206 04:12
89 Explanation - Add Two Numbers - Medium #2 09:53
90 Code - Add Two Numbers - Medium #2 04:49
91 [Custom Input - NEW] - Add Two Numbers - Medium #2 06:41
92 Explanation - Remove Nth Node From End of List - Medium #19 07:28
93 Code - Remove Nth Node From End of List - Medium #19 02:36
94 [Custom Input - NEW] - Remove Nth Node From End of List - Medium #19 04:36
95 Explanation - Odd Even Linked List - Medium #328 07:38
96 Code - Odd Even Linked List - Medium #328 04:04
97 [Custom Input - NEW] - Odd Even Linked List - Medium #328 05:33
98 Explanation - Merge K Sorted Lists - Hard #23 09:26
99 Code - Merge K Sorted Lists - Hard #23 08:02
100 Explanation - Subsets - Medium #78 22:25
101 Code - Subsets - Medium #78 03:03
102 Explanation - Letter Combinations of a Phone Number - Medium #17 20:01
103 Code - Letter Combinations of a Phone Number - Medium #17 06:02
104 Explanation - Word Search - Medium #79 28:24
105 Code - Word Search - Medium #79 09:09
106 Explanation - Combination Sum - Medium #39 29:00
107 Code - Combination Sum - Medium #39 03:51
108 Explanation - Palindrome Partitioning - Medium #131 11:59
109 Code - Palindrome Partitioning - Medium #131 05:29
110 What are stacks ? 04:03
111 Stacks Implementation 02:43
112 What are Queues 03:28
113 Queues Implementation 02:17
114 What are Graphs ? 04:05
115 Directed Graph Implementation - Adjacency List 07:57
116 Directed Graph Implementation - Adjacency Matrix 10:14
117 Undirected Graph Implementation - Adjacency List 07:29
118 Undirected Graph Implementation - Adjacency Matrix 06:12
119 Depth First Search (DFS) 08:57
120 DFS implementation 08:09
121 Breadth First Search (BFS) 08:35
122 BFS Implementation 07:55
123 Dijkstra's Algorithm 11:13
124 Explanation - network delay time - Medium #743 08:13
125 Code - network delay time - Medium #743 08:55
126 What are trees ? 11:40
127 Trees Implementation 03:33
128 In-order Traversal Technique 04:23
129 In-order traversal implementation 04:48
130 Pre-order Traversal Technique 04:05
131 Pre-order traversal implementation 03:20
132 Post-order Traversal Technique 03:54
133 Post-order traversal implementation 03:20
134 What is a binary search tree (BST) 06:44
135 Binary Search tree creation and insertion implementation 10:46
136 Binary search tree searching Implementation 06:31
137 BInary search tree deletion implementation 07:10
138 Explanation - Symmetric Trees - Easy #101 08:30
139 Code - Symmetric Trees - Easy #101 02:45
140 Explanation - Maximum Depth of Binary Tree - Easy #104 12:04
141 Code - Maximum Depth of Binary Tree - Easy #104 02:15
142 Explanation - Path Sum - Easy #112 06:31
143 Code - Path Sum - Easy #112 02:36
144 Explanation- Lowest Common Ancestor of a Binary Tree - Medium #236 14:46
145 Code- Lowest Common Ancestor of a Binary Tree - Medium #236 03:05
146 Explanation - Kth Smallest Element in a BST - Medium #230 10:30
147 Code - Kth Smallest Element in a BST - Medium #230 01:57
148 Explanation - Serialize and Deserialize Binary Tree - hard #297 11:01
149 Code - Serialize and Deserialize Binary Tree - hard #297 05:20
150 Explanation - Binary Tree Maximum Path Sum - Hard #124 23:45
151 Code - Binary Tree Maximum Path Sum - Hard #124 03:28
152 Explanation - Min Stack - Easy #155 06:07
153 Code - Min Stack - Easy #155 02:28
154 Explanation - Valid Parenthesis - Easy #20 09:19
155 Code - Valid Parenthesis - Easy #20 04:19
156 Explanation - Binary Tree Level Order Traversal - Medium #102 10:54
157 Code - Binary Tree Level Order Traversal - Medium #102 03:23
158 Explanation - Binary Tree Zigzag Level Order Traversal - Medium #103 14:44
159 Code - Binary Tree Zigzag Level Order Traversal - Medium #103 04:06
160 Explanation - Binary Tree Postorder Traversal - Medium #145 10:28
161 Code - Binary Tree Postorder Traversal - Medium #145 02:14
162 What is Dynamic Programming ? 06:52
163 Explanation - House Robber - Easy #198 06:44
164 Code - House Robber - Easy #198 03:57
165 Explanation - Best Time to Buy and Sell Stock - Easy #121 08:35
166 Code - Best Time to Buy and Sell Stock - Easy #121 02:13
167 Explanation - Climbing Stairs - Easy #70 04:52
168 Code - Climbing Stairs - Easy #70 03:05
169 Explanation - Coin Change - Medium #322 13:04
170 Code - Coin Change - Medium #322 04:04
171 Explanation - Unique Paths - Medium #62 08:42
172 Code - Unique Paths - Medium #62 03:18
173 Explanation - Longest Palindromic Substring - Medium #5 22:44
174 Code - Longest Palindromic Substring - Medium #5 04:25
175 Explanation - Trapping Rain Water - Hard #42 21:55
176 Code - Trapping Rain Water - Hard #42 04:22

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