LeetCode In C++: Algorithms Coding Interview Questions

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

1 - Microsoft Array Question Container with most water Medium

1 - Introduction to the problem

2 - Brute force solution intuition

3 - Pseudocode walkthrough

4 - Better Approach intuition

5 - Approach 2 Pseudocode walkthrough

6 - Implementing the code

2 - Google Array Question Valid mountain array Easy

7 - Introduction to the problem

8 - How to think about this problem

9 - Pseudocode Walkthrough

10 - Implementing the code

3 - Google Array Question Boats to save people Medium

11 - Problem Introduction

12 - How to intuitively think about this problem

13 - Pseudocode Walkthrough

14 - Implementing the code

4 - Facebook Array Question Move Zeroes Easy

15 - Brute force Intuition

16 - Brute force pseudocode walkthrough

17 - Better Approach Intuition

18 - Better Approach Pseudocode walkthrough

19 - Implementing the code

5 - Amazon Array Question Longest substring without repeating characters Medium

20 - Introduction to the problem

21 - Brute Force Intuition

22 - Pseudocode walkthrough

23 - Approach 2 Intuition

24 - Approach 2 pseudocode walkthrough

25 - Implementing the code

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

26 - Introduction to the problem and brute force approach

27 - Brute force Pseudocode walkthrough

28 - Approach 2 Optimal Approach intuition

29 - Pseudocode walkthrough part 1

30 - Pseudocode walkthrough part 2

31 - Implementing the code

7 - Google Array question first bad version Easy

32 - Introduction To The Problem And Brute Force Approach

33 - Optimal Solution Intuition

34 - Optimal solution pseudocode walkthrough

35 - Implementing the code

8 - Microsoft Math Question Missing Number Easyish

36 - Introduction to the problem

37 - Approach 1 Brute Force Approach

38 - Approach 2 A Better Approach Explanation

39 - PseudoCode Walkthrough For Approach 2

40 - Implementing the code

41 - Approach 3 Optimal Approach

42 - Implementing the optimal approach

9 - Amazon Math Question Count Primes

43 - Problem Introduction And Brute Force Explanation

44 - Pseudocode Walkthrough For Brute Force Approach

45 - Approach 2 Optimal solution

46 - Pseudocode Walkthrough For Optimal Approach

47 - Code Implementation

10 - Airbnb Math Question Single Number

48 - Introduction to the problem and brute force approach

49 - Pseudocode walkthrough for brute approach

50 - Approach 2 better Approach

51 - Implementing the code

52 - Approach 3 optimal approach

53 - Implementing the optimal approach

11 - Amazon Math Question Robot return to origin Easy

54 - Explaining the problem

55 - Implementing the code

12 - Facebook Math Question Add Binary Easy

56 - Introduction to the problem

57 - Examples of binary additions

58 - Pseudocode Implementation

59 - Pseudocode Walkthrough

60 - Implementing the code

13 - Google Hash Tables Dictionaries question Two Sum Easy

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

62 - Brute force Pseudocode Implementation

63 - Pseudocode Walkthrough

64 - Approach 2 Optimal Approach Explanation

65 - Pseudocode Walkthrough

66 - Code Implementation

14 - Google Hash Tables Dictionaries question Contains Duplicate

67 - Introduction to the problem and multiple approaches

68 - Optimal Approach

69 - Code Implementation

15 - Google Hash Tables Dictionaries question Majority Element

70 - Approach 1 Intuition

71 - Approach 1 Pseudocode Walkthrough

72 - Approach 2 Majority Element Intuition

73 - Implementing Approach 2 code

74 - Approach 3 Intuition Optimal solution

75 - Approach 3 Walkthrough Optimal solution

76 - Implementing Approach 3 optimal approach

16 - Hash Tables Dictionaries question 4sum 2 Medium

77 - Brute force Explanation

78 - Brute Force Pseudocode Walkthrough

79 - Approach 2 Optimal approach

80 - Implementing the code

17 - Linkedin Hash Tables Dictionaries question Minimum Window Substring Hard

81 - Explanation Minimum Window Substring part 1

82 - Explanation Minimum window substring part 2

83 - Explanation Minimum window substring part 3

84 - Pseudocode Implementation

85 - Pseudocode Walkthrough

86 - Code Implementation Minimum Window Substring

18 - Facebook Hash Tables Dictionaries question Group Anagrams Medium

87 - Explanation Group Anagrams Medium 49

19 - Microsoft Hash Tables Dictionaries question LRU Cache Medium

88 - Introduction to the problem

89 - InputOuput for the problem

90 - Intuition behind the problem

91 - Pseudocode implementation

92 - Pseudocode Walkthrough

20 - Apple Linked list question Merge Two Sorted Lists Easy

93 - Explanation Merge Two Sorted Lists Easy 21

94 - Pseudocode Implementation Merge Two Sorted Lists Easy 21

95 - Walkthrough Merge Two Sorted Lists Easy 21

96 - Code Merge Two Sorted Lists Easy 21

21 - Amazon Linked list question Linked list cycle Medium

97 - Explanation Linked List Cycle Easy 141

98 - Intuition Linked List Cycle Easy 141

99 - Walkthrough Linked List Cycle Easy 141

100 - Code Linked List Cycle Easy 141

22 - Microsoft Linked list question Reverse linked list Medium

101 - Explanation Reverse Linked List

102 - Intuition Reverse Linked List

103 - pseudocode Implementation Walkthrough Reverse Linked List

104 - Implementing the code Reverse Linked List

23 - Adobe Linked list question Add two numbers Medium

105 - Explanation Add Two Numbers

106 - Intuition Add Two Numbers

107 - Pseudocode Implementation Add Two Numbers

108 - Walkthrough Add Two Numbers

109 - Code Add Two Numbers

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

110 - Explanation Remove Nth Node From End of List

111 - Intuition Remove Nth Node From End of List

112 - Walkthrough Remove Nth Node From End of List

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

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

115 - Code Remove Nth Node From End of List

25 - Linked list question Odd Even linked list Medium

116 - Explanation Odd Even Linked List

117 - Intuition Odd Even Linked List

118 - Implementation Odd Even Linked List

119 - Walkthrough Odd Even Linked List

120 - Code Odd Even Linked List

26 - Facebook Backtracking question Subsets Medium

121 - Explanation Subsets

122 - Cascading solution explanation Subsets

123 - Cascading solution walkthrough Subsets

124 - Backtracking Approach 2 explanation Subsets

125 - Implementing the code

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

126 - Explanation Letter Combinations of a Phone Number

127 - Intuition Letter Combinations of a Phone Number

128 - Walkthrough Letter Combinations of a Phone Number

129 - Code Letter Combinations of a Phone Number

28 - Microsoft Backtracking question Word Search Medium

130 - Explanation Word Search Medium 79

29 - Uber Backtracking question Combination Sum Medium

131 - Explanation the problem

132 - Intuition behind the problem

133 - Walkthrough over the pseudocode

134 - Implementing the code

30 - Bloomberg Backtracking question Palindrome Partitioning Medium

135 - Explaining the problem

136 - Pseudocode implementation

137 - Walkthrough over pseudocode

138 - Implementing the code

31 - Microsoft Trees question Symmetric Trees Easy

139 - Explaining the problem

140 - Intuition behind the problem

141 - Walkthrough over pseudocode

142 - Implementing the code

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

143 - Explaining the problem

144 - Intuition and pseudocode implementation

145 - Walkthrough over pseudocode

146 - Implementing the real code

33 - Amazon Trees question Path Sum Easy

147 - Explaining the problem

148 - Intuition behind the problem

149 - Walkthrough over pseudocode

150 - Coding the solution

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

151 - Explaining the problem

152 - Intuition behind the problem

153 - Pseudocode implementation

154 - Walkthrough over pseudocode

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

155 - Explaining the problem and brute force approach

156 - Optimised Solution Explanation

157 - Implementing the code

36 - Microsoft Trees question Serialise And Deserialise Binary Tree Hard

158 - Explaining the Serialisation

159 - Walkthrough over pseudocode Serialisation

160 - Explaining the Deserialisation

161 - Walkthrough over pseudocode Deserialisation

37 - Microsoft Trees question Binary Tree Maximum Path Sum Hard

162 - Explaining the problem

163 - Intuition behind the problem

164 - Walkthrough over pseudocode

165 - Coding the solution

38 - Google Stack Question Min Stack Easy

166 - Brute force explanation

167 - Walkthrough over pseudocode

168 - Optimal solution explanation

39 - Amazon Stack Question Valid Parenthesis Easy

169 - Explaining the problem

170 - Intuition behind this problem

171 - Pseudocode Implementation

172 - Walkthrough over the pseudocode

173 - Implementing the code

40 - Apple Stack Question Binary Tree Level Order Traversal Medium

174 - Explaining the problem

175 - Walkthrough over pseudocode

176 - Implementing the code

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

177 - Explaining the problem

178 - Intuition behind the problem

179 - Walkthrough over pseudocode

180 - Optimal solution explanation

181 - Optimal solution pseudocode walkthrough

182 - Implementing the code

42 - Stack Question Binary Tree Postorder Traversal Medium

183 - Explanation of the problem

184 - Implementing the code

43 - Google Dynamic Programming Question House Robber Easy

185 - Explanation behind the problem

186 - Intuition behind the problem

187 - 2nd Approach Bottom Up dynamic programming

188 - Walkthrough behind pseudocode

189 - Implementing the code

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

190 - Explanation behind the problem

191 - Intuition behind the problem

192 - Walkthrough over pseudocode

193 - Optimal solution explanation

194 - Coding the solution

45 - Amazon Dynamic Programming Question Climbing Stairs Easy

195 - Explaining the problem

196 - Intuition behind the problem

197 - Implementation the pseudocode

198 - Bottom up approach explanation

199 - Bottom up approach walkthrough

200 - Bottom up optimisation

201 - Code Climbing Stairs

46 - Google Dynamic Programming Question Coin Change Medium

202 - Explaining the problem

203 - Intuition behind the problem

204 - Pseudocode Implementation and optimisation

205 - Bottom up approach explanation

206 - Implementing the code

47 - Bloomberg Dynamic Programming Question Unique Paths Medium

207 - Explaining the problem

208 - Pseudocode Implementation and walkthrough

209 - Implementing the code

48 - Microsoft Dynamic Programming Question Longest Palindromic Substring Medium

210 - Explanation of the problem

211 - Initial Intuition behind the problem

212 - Optimising the previous solution

213 - Pseudocode Implementation

214 - Walkthrough over pseudocode

215 - Implementing the code

49 - Amazon Dynamic Programming Question Trapping Rain Water Hard

216 - Explaining the problem

217 - Coding the implementation

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