This is a backfill note from 2019-09-09. In 2019, I mentored a college student who was applying for computer science internships. I helped source LeetCode problems that I thought were interesting; here is the list I came up with.

(It looks like the numbering has changed since I compiled this list.)

LeetCode interview prep

LinkedList

2. Add Two Numbers

3. Merge Two Sorted Lists

4. Remove Duplicates from Sorted List II

5. Remove Duplicates from Sorted List

6. Linked List Cycle

Binary Tree

94. Binary Tree Inorder Traversal

95. Maximum Depth of Binary Tree

96. Convert Sorted Array to Binary Search Tree

97. Balanced Binary Tree

98. Binary Tree Preorder Traversal

99. Binary Tree Postorder Traversal

100. Diameter of Binary Tree

101. Binary Search Tree to Greater Sum Tree

Hash Table

1. Two Sum

2. Single Number

3. Happy Number

Stack / Queue

20. Valid Parentheses

21. Rotting Oranges

Dynamic Programming

53. Maximum Subarray

54. Climbing Stairs

Miscellaneous

7. Reverse Integer

8. Palindrome Number

9. Roman to Integer

10. Longest Common Prefix

11. Remove Duplicates from Sorted Array

12. Search Insert Position

13. Add Binary

Good Ones We Didn’t Get To

121. Best Time to Buy and Sell Stock

122. Surrounded Regions

123. Valid Anagram

124. Employee Importance

125. Min Cost Climbing Stairs

126. Open the Lock

127. Sliding Puzzle

128. K Closest Points to Origin