Leetcode in PHP: 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

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 - Hash Tables Dictionaries question 4sum 2 Medium

79 - Brute force Explanation

80 - Brute Force Pseudocode Walkthrough

81 - Approach 2 Optimal approach

82 - Implementing the code

18 - LinkedIn Hash Tables Dictionaries question Minimum Window Substring Hard

83 - Explanation Minimum Window Substring part 1

84 - Explanation Minimum window substring part 2

85 - Explanation Minimum window substring part 3

86 - Pseudocode Implementation

87 - Pseudocode Walkthrough

88 - Code Implementation Minimum Window Substring

19 - Facebook Hash Tables Dictionaries question Group Anagrams Medium

89 - Explanation Group Anagrams Medium 49

90 - Coding the implementation

20 - Microsoft Hash Tables Dictionaries question LRU Cache Medium

91 - Introduction to the problem

92 - InputOutput for the problem

93 - Intuition behind the problem

94 - Pseudocode implementation

21 - Apple Linked list question Merge Two Sorted Lists Easy

95 - Explanation Merge Two Sorted Lists Easy 21

96 - Pseudocode Implementation Merge Two Sorted Lists Easy 21

97 - Walkthrough Merge Two Sorted Lists Easy 21

98 - Code Merge Two Sorted Lists Easy 21

22 - Amazon Linked list question Linked list cycle Medium

99 - Explanation Linked List Cycle Easy 141

100 - Intuition Linked List Cycle Easy 141

101 - Walkthrough Linked List Cycle Easy 141

102 - Code Linked List Cycle Easy 141

23 - Microsoft Linked list question Reverse linked list Medium

103 - Explanation Reverse Linked List

104 - Intuition Reverse Linked List

105 - pseudocode Implementation Walkthrough Reverse Linked List

106 - Implementing the code Reverse Linked List

24 - Adobe Linked list question Add two numbers Medium

107 - Explanation Add Two Numbers

108 - Intuition Add Two Numbers

109 - Pseudocode Implementation Add Two Numbers

110 - Walkthrough Add Two Numbers

111 - Code Add Two Numbers

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

112 - Explanation Remove Nth Node From End of List

113 - Intuition Remove Nth Node From End of List

114 - Walkthrough Remove Nth Node From End of List

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

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

117 - Code Remove Nth Node From End of List

26 - Linked list question Odd Even linked list Medium

118 - Explanation Odd Even Linked List

119 - Intuition Odd Even Linked List

120 - Implementation Odd Even Linked List

121 - Walkthrough Odd Even Linked List

122 - Code Odd Even Linked List

27 - Facebook Backtracking question Subsets Medium

123 - Explanation Subsets

124 - Cascading solution explanation Subsets

125 - Cascading solution walkthrough Subsets

126 - Backtracking Approach 2 explanation Subsets

127 - Implementing the code

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

128 - Explanation Letter Combinations of a Phone Number

129 - Intuition Letter Combinations of a Phone Number

130 - Walkthrough Letter Combinations of a Phone Number

131 - Code Letter Combinations of a Phone Number

29 - Uber Backtracking question Combination Sum Medium

132 - Explanation the problem

133 - Intuition behind the problem

134 - Walkthrough over the pseudocode

135 - Implementing the code

30 - Bloomberg Backtracking question Palindrome Partitioning Medium

136 - Explaining the problem

137 - Pseudocode implementation

138 - Walkthrough over pseudocode

139 - Implementing the code

31 - Microsoft Trees question Symmetric Trees Easy

140 - Explaining the problem

141 - Intuition behind the problem

142 - Walkthrough over pseudocode

143 - Implementing the code

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

144 - Explaining the problem

145 - Intuition and pseudocode implementation

146 - Walkthrough over pseudocode

147 - Implementing the real code

33 - Amazon Trees question Path Sum Easy

148 - Explaining the problem

149 - Intuition behind the problem

150 - Walkthrough over pseudocode

151 - Coding the solution

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

152 - Explaining the problem

153 - Intuition behind the problem

154 - Pseudocode implementation

155 - Coding Implementing

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

156 - Explaining the problem and brute force approach

157 - Optimised Solution Explanation

158 - Implementing the code

36 - Microsoft Trees question Serialise And Deserialise Binary Tree Hard

159 - Explaining the Serialisation

160 - Walkthrough over pseudocode Serialisation

161 - Explaining the Deserialisation

162 - Walkthrough over pseudocode Deserialisation

37 - Microsoft Trees question Binary Tree Maximum Path Sum Hard

163 - Explaining the problem

164 - Intuition behind the problem

165 - Walkthrough over pseudocode

166 - Coding the solution

38 - Google Stack Question Min Stack Easy

167 - Brute force explanation

168 - Walkthrough over pseudocode

169 - Optimal solution explanation

170 - Implementing the code

39 - Amazon Stack Question Valid Parenthesis Easy

171 - Explaining the problem

172 - Intuition behind this problem

173 - Pseudocode Implementation

174 - Walkthrough over the pseudocode

175 - Implementing the code

40 - Apple Stack Question Binary Tree Level Order Traversal Medium

176 - Explaining the problem

177 - Walkthrough over pseudocode

178 - Implementing the code

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

179 - Explaining the problem

180 - Intuition behind the problem

181 - Walkthrough over pseudocode

182 - Optimal solution explanation

183 - Optimal solution pseudocode walkthrough

184 - Implementing the code

42 - Stack Question Binary Tree Postorder Traversal Medium

185 - Explanation of the problem

186 - Implementing the code

43 - Google Dynamic Programming Question House Robber Easy

187 - Explanation behind the problem

188 - Intuition behind the problem

189 - 2nd Approach Bottom Up dynamic programming

190 - Walkthrough behind pseudocode

191 - Implementing the code

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

192 - Explanation behind the problem

193 - Intuition behind the problem

194 - Walkthrough over pseudocode

195 - Optimal solution explanation

196 - Coding the solution

45 - Amazon Dynamic Programming Question Climbing Stairs Easy

197 - Explaining the problem

198 - Intuition behind the problem

199 - Implementation the pseudocode

200 - Bottom up approach explanation

201 - Bottom up approach walkthrough

202 - Bottom up optimisation

203 - Code Climbing Stairs

46 - Google Dynamic Programming Question Coin Change Medium

204 - Explaining the problem

205 - Intuition behind the problem

206 - Pseudocode Implementation and optimisation

207 - Bottom up approach explanation

208 - Implementing the code

47 - Bloomberg Dynamic Programming Question Unique Paths Medium

209 - Explaining the problem

210 - Pseudocode Implementation and walkthrough

211 - Implementing the code

48 - Microsoft Dynamic Programming Question Longest Palindromic Substring Medium

212 - Explanation of the problem

213 - Initial Intuition behind the problem

214 - Optimising the previous solution

215 - Pseudocode Implementation

216 - Walkthrough over pseudocode

217 - Implementing the code

49 - Amazon Dynamic Programming Question Trapping Rain Water Hard

218 - Explaining the problem

219 - Coding the implementation

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