Leetcode in Swift: Algorithms coding interview questions

سرفصل های دوره

Practice data structure and algorithms questions for interviews at FAANG companies like Google, Facebook, Apple & Amazon

1 - Introduction

1 - What to do if you dont understand an explanation or code video Important.html

2 - Utilise the video format of online courses.html

2 - Microsoft Array Question Container with most water Medium

3 - Introduction to the problem

4 - Brute Force solution Intuition

5 - pseudocode walkthrough

6 - Better Approach intuition

7 - Approach 2 Pseudocode walkthrough

8 - Implementing the code

3 - Google Array Question Valid mountain array Easy

9 - Introduction to the problem

10 - How to think about this problem

11 - Pseudocode Walkthrough

12 - Implementing the code

4 - Google Array Question Boats to save people Medium

13 - Problem Introduction

14 - How to intuitively think about this problem

15 - Pseudocode Walkthrough

16 - Implementing the code

5 - Facebook Array Question Move Zeroes Easy

17 - Brute force Intuition

18 - Brute force pseudocode walkthrough

19 - Better Approach Intuition

20 - Better Approach Pseudocode walkthrough

21 - Implementing the code

6 - Amazon Array Question Longest substring without repeating characters Medium

22 - Introduction to the problem

23 - Brute Force Intuition

24 - Pseudocode walkthrough

25 - Approach 2 Intuition

26 - Approach 2 pseudocode walkthrough

27 - Implementing the code

7 - Arrays QuestionFind first and last position of element in sorted Array Medium

28 - Introduction to the problem and brute force approach

29 - Brute force Pseudocode walkthrough

30 - Approach 2 Optimal Approach intuition

31 - Pseudocode walkthrough part 1

32 - Pseudocode walkthrough part 2

33 - Implementing the code

8 - Google Array question first bad version Easy

34 - Introduction To The Problem And Brute Force Approach

35 - Optimal Solution Intuition

36 - Optimal solution pseudocode walkthrough

37 - Implementing the code

9 - Microsoft Math Question Missing Number Easyish

38 - Introduction to the problem

39 - Approach 1 Brute Force Approach

40 - Approach 2 A Better Approach Explanation

41 - PseudoCode Walkthrough For Approach 2

42 - Implementing the code

43 - Approach 3 Optimal Approach

44 - Implementing the optimal approach

10 - Amazon Math Question Count Primes

45 - Problem Introduction And Brute Force Explanation

46 - Pseudocode Walkthrough For Brute Force Approach

47 - Approach 2 Optimal solution

48 - Pseudocode Walkthrough For Optimal Approach

49 - Code Implementation

11 - Airbnb Math Question Single Number

50 - Introduction to the problem and brute force approach

51 - Pseudocode walkthrough for brute approach

52 - Approach 2 better Approach

53 - Implementing the code

54 - Approach 3 optimal approach

55 - Implementing the optimal approach

12 - Amazon Math Question Robot return to origin Easy

56 - Explaining the problem

57 - Implementing the code

13 - Facebook Math Question Add Binary Easy

58 - Introduction to the problem

59 - Examples of binary additions

60 - Pseudocode Implementation

61 - Pseudocode Walkthrough

62 - Implementing the code

14 - Google Hash Tables Dictionaries question Two Sum Easy

63 - Approach 1 Introduction to the problem and brute force approach

64 - Brute force Pseudocode Implementation

65 - Pseudocode Walkthrough

66 - Approach 2 Optimal Approach Explanation

67 - Pseudocode Walkthrough

68 - Code Implementation

15 - Google Hash Tables Dictionaries question Contains Duplicate

69 - Introduction to the problem and multiple approaches

70 - Optimal Approach

71 - Code Implementation

16 - Google Hash Tables Dictionaries question Majority Element

72 - Approach 1 Intuition

73 - Approach 1 Pseudocode Walkthrough

74 - Approach 2 Majority Element Intuition

75 - Implementing Approach 2 code

76 - Approach 3 Intuition Optimal solution

77 - Approach 3 Walkthrough Optimal solution

78 - Implementing Approach 3 optimal approach

17 - Facebook Hash Tables Dictionaries question Group Anagrams Medium

79 - Explanation Group Anagrams Medium 49

80 - Code Group Anagrams Medium 49

18 - Hash Tables Dictionaries question 4sum 2 Medium

81 - Brute force Explanation

82 - Brute Force Pseudocode Walkthrough

83 - Approach 2 Optimal approach

84 - Implementing the code

19 - Microsoft Hash Tables Dictionaries question LRU Cache Medium

85 - Introduction to the problem

86 - InputOuput for the problem

87 - Intuition behind the problem

88 - Pseudocode implementation

89 - Pseudocode Walkthrough

20 - Linkedin Hash Tables Dictionaries question Minimum Window Substring Hard

90 - Explanation Minimum Window Substring part 1

91 - Explanation Minimum window substring part 2

92 - Explanation Minimum window substring part 3

93 - Pseudocode Implementation

94 - Pseudocode Walkthrough

95 - Code Minimum Window Substring Hard 76

21 - Apple Linked list question Merge Two Sorted Lists Easy

96 - Explanation Merge Two Sorted Lists Easy 21

97 - Implementation Merge Two Sorted Lists Easy 21

98 - Walkthrough Merge Two Sorted Lists Easy 21

99 - Code Merge Two Sorted Lists Easy 21

22 - Amazon Linked list question Linked list cycle Medium

100 - Explanation Linked List Cycle Easy 141

101 - Intuition Linked List Cycle Easy 141

102 - Walkthrough Linked List Cycle Easy 141

103 - Code Linked List Cycle Easy 141

23 - Microsoft Linked list question Reverse linked list Easy

104 - Explanation Reverse Linked List

105 - Intuition Reverse Linked List

106 - pseudocode Implementation Walkthrough Reverse Linked List

107 - Implementing the code Reverse Linked List

24 - Adobe Linked list question Add two numbers Medium

108 - Explanation Add Two Numbers

109 - Intuition Add Two Numbers

110 - Implementation Add Two Numbers

111 - Walkthrough Add Two Numbers Medium 2

112 - Code Add Two Numbers

25 - Linked list question Remove Nth node from end of list Medium

113 - Explanation Remove Nth Node From End of List

114 - Intuition Remove Nth Node From End of List

115 - Walkthrough Remove Nth Node From End of List

116 - Approach 2 Explanation Remove Nth Node From End of List

117 - Approach 2 Walkthrough Remove Nth Node From End of List Medium 19

118 - Code Remove Nth Node From End of List

26 - Linked list question Odd Even linked list Medium

119 - Explanation Odd Even Linked List

120 - Intuition Odd Even Linked List

121 - Implementation Odd Even Linked List

122 - Walkthrough Odd Even Linked List

123 - Code Odd Even Linked List

27 - Google Linked list question Merge K sorted lists Hard

124 - Explanation Merge K Sorted Lists Hard 23

125 - Code Merge K Sorted Lists Hard 23

28 - Facebook Backtracking question Subsets Medium

126 - Explanation Subsets

127 - Cascading solution explanation Subsets

128 - Cascading solution walkthrough Subsets

129 - Backtracking Approach 2 explanation Subsets

130 - Implementing the code

29 - Amazon Backtracking question Letter Combination of a Phone Number Medium

131 - Explanation Letter Combinations of a Phone Number

132 - Intuition Letter Combinations of a Phone Number

133 - Walkthrough Letter Combinations of a Phone Number

134 - Code Letter Combinations of a Phone Number

30 - Microsoft Backtracking question Word Search Medium

135 - Explanation Word Search Medium 79

31 - Uber Backtracking question Combination Sum Medium

136 - Explanation the problem

137 - Intuition behind the problem

138 - Walkthrough over the pseudocode

139 - Implementing the code

32 - Bloomberg Backtracking question Palindrome Partitioning Medium

140 - Intuition behind the problem

141 - Pseudocode implementation

142 - Walkthrough over pseudocode

143 - Implementing the code

33 - Microsoft Trees question Symmetric Trees Easy

144 - Explaining the problem

145 - Intuition behind the problem

146 - Walkthrough over pseudocode

147 - Implementing the code

34 - Google Trees question Maximum Depth of a Binary Tree Easy

148 - Explaining the problem

149 - Intuition and pseudocode implementation

150 - Walkthrough over pseudocode

151 - Implementing the code

35 - Amazon Trees question Path Sum Easy

152 - Explaining the problem

153 - Intuition behind the problem

154 - Walkthrough over pseudocode

155 - Coding the solution

36 - Facebook Trees question Lowest Common Ancestor of a Binary Tree Medium

156 - Explaining the problem

157 - Intuition behind the problem

158 - Pseudocode implementation

159 - Walkthrough over pseudocode

160 - Coding the solution

37 - Google Trees question Kth Smallest Element In a BST Medium

161 - Explaining the problem

162 - Optimized Solution Explanation Kth Smallest Element in a BST Medium 230

163 - Code Kth Smallest Element in a BST Medium 230

38 - Microsoft Trees question Serialise And Deserialise Binary Tree Hard

164 - Explaining the Serialisation

165 - Walkthrough over pseudocode Serialisation

166 - Explaining the Deserialisation

167 - Walkthrough over pseudocode Deserialisation

39 - Microsoft Trees question Binary Tree Maximum Path Sum Hard

168 - Explaining the problem

169 - Intuition behind the problem

170 - Walkthrough over pseudocode

171 - Coding the solution

40 - Google Stack Question Min Stack Easy

172 - Brute force explanation Min Stack Easy 155

173 - Walkthrough over pseudocode

174 - Optimal solution explanation

175 - Coding the solution

41 - Amazon Stack Question Valid Parenthesis Easy

176 - Explaining the problem

177 - Intuition behind this problem

178 - Pseudocode Implementation

179 - Walkthrough over the pseudocode

180 - Code Valid Parenthesis Easy 20

42 - Apple Stack Question Binary Tree Level Order Traversal Medium

181 - Explaining the problem

182 - Walkthrough over pseudocode

183 - Implementing the code

43 - Microsoft Queue Question Binary Tree Zigzag Level Order Traversal Medium

184 - Explaining the problem

185 - Intuition behind the problem

186 - Walkthrough over pseudocode

187 - Optimal solution explanation

188 - Optimal solution pseudocode walkthrough

189 - Implementing the code

44 - Stack Question Binary Tree Postorder Traversal Medium

190 - Explanation of the problem

191 - Implementing the code

45 - Google Dynamic Programming Question House Robber Easy

192 - Explanation behind the problem

193 - Intuition behind the problem

194 - 2nd Approach Bottom Up dynamic programming

195 - Walkthrough behind pseudocode

196 - Implementing the code

46 - Facebook Dynamic Programming Question Best Time To Buy And Sell Stocks Easy

197 - Explanation behind the problem

198 - Intuition behind the problem

199 - Walkthrough over pseudocode

200 - Optimal solution explanation

201 - Coding the solution

47 - Amazon Dynamic Programming Question Climbing Stairs Easy

202 - Explaining the problem

203 - Intuition behind the problem

204 - Implementation the pseudocode

205 - Bottom up approach explanation

206 - Bottom up approach walkthrough Climbing Stairs Easy 70

207 - Bottom up optimization Climbing Stairs Easy 70

208 - Code Climbing Stairs Easy 70

48 - Google Dynamic Programming Question Coin Change Medium

209 - Explaining the problem

210 - Intuition behind the problem

211 - Pseudocode Implementation and optimisation

212 - Bottom up approach explanation

213 - Implementing the code

49 - Bloomberg Dynamic Programming Question Unique Paths Medium

214 - Explaining the problem

215 - Pseudocode Implementation and walkthrough

216 - Implementing the code

50 - Microsoft Dynamic Programming Question Longest Palindromic Substring Medium

217 - Explanation of the problem

218 - Initial Intuition behind the problem

219 - Optimising the previous solution

220 - Pseudocode Implementation

221 - Walkthrough over pseudocode

222 - Implementing the code

51 - Amazon Dynamic Programming Question Trapping Rain Water Hard

223 - Explaining the problem

224 - Coding the implementation

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