LeetCode Problems - Java Missing Solutions Checklist

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Easy Problems

• 1. Two Sum
• 11. Container With Most Water
• 118. Pascal's Triangle
• 119. Pascal's Triangle II
• 122. Best Time to Buy and Sell Stock II
• 136. Single Number
• 141. Linked List Cycle
• 167. Two Sum II - Input Array Is Sorted
• 169. Majority Element
• 205. Isomorphic Strings
• 206. Reverse Linked List
• 217. Contains Duplicate
• 226. Invert Binary Tree
• 231. Power of Two
• 232. Implement Queue using Stacks
• 237. Delete Node in a Linked List
• 242. Valid Anagram
• 258. Add Digits
• 263. Ugly Number
• 268. Missing Number
• 278. First Bad Version
• 283. Move Zeroes
• 290. Word Pattern
• 326. Power of Three
• 342. Power of Four
• 344. Reverse String
• 345. Reverse Vowels of a String
• 367. Valid Perfect Square
• 383. Ransom Note
• 387. First Unique Character in a String
• 392. Is Subsequence
• 404. Sum of Left Leaves
• 409. Longest Palindrome
• 412. Fizz Buzz
• 415. Add Strings
• 434. Number of Segments in a String
• 459. Repeated Substring Pattern
• 507. Perfect Number
• 509. Fibonacci Number
• 520. Detect Capital
• 543. Diameter of Binary Tree
• 572. Subtree of Another Tree
• 617. Merge Two Binary Trees
• 637. Average of Levels in Binary Tree
• 67. Add Binary
• 680. Valid Palindrome II
• 69. Sqrt(x)
• 70. Climbing Stairs
• 704. Binary Search
• 733. Flood Fill
• 771. Jewels and Stones
• 83. Remove Duplicates from Sorted List
• 876. Middle of the Linked List
• 929. Unique Email Addresses
• 938. Range Sum of BST
• 2235. Add Two Integers
• 2413. Smallest Even Multiple
• 2469. Convert the Temperature
• 1480. Running Sum of 1D Array
• 1672. Richest Customer Wealth
• 1431. Kids With the Greatest Number of Candies
• 1512. Number of Good Pairs
• 1920. Build Array from Permutation
• 1929. Concatenation of Array
• 2011. Final Value of Variable After Performing Operations
• 1342. Number of Steps to Reduce a Number to Zero
• 1108. Defanging an IP Address
• 1470. Shuffle the Array
• 1678. Goal Parser Interpretation
• 1684. Count the Number of Consistent Strings
• 1768. Merge Strings Alternately
• 2138. Divide a String Into Groups of Size k
• 2161. Partition Array According to Given Pivot
• 2181. Merge Nodes in Between Zeros
• 2220. Minimum Bit Flips to Convert Number
• 2294. Partition Array Such That Maximum Difference is k
• 2373. Largest Local Values in a Matrix
• 2396. Strictly Palindromic Number
• 2433. Find The Original Array of Prefix Xor
• 2574. Left and Right Sum Differences
• 2769. Find the Maximum Achievable Number
• 2798. Number of Employees Who Met the Target
• 2824. Count Pairs Whose Sum is Less than Target
• 2894. Divisible and Non-divisible Sums Difference
• 2942. Find Words Containing Character
• 3110. Score of a String
• 3136. Valid Word
• 3190. Find Minimum Operations to Make All Elements Divisible by Three
• 3280. Convert Date to Binary
• 3289. The Two Sneaky Numbers of Digitville
• 3330. Find the Original Typed String I
• 3467. Transform Array by Parity
• 3541. Find Most Frequent Vowel and Consonant

Medium Problems

• 102. Binary Tree Level Order Traversal
• 1038. Binary Search Tree to Greater Sum Tree
• 131. Palindrome Partitioning
• 133. Clone Graph
• 144. Binary Tree Preorder Traversal
• 145. Binary Tree Postorder Traversal
• 165. Compare Version Numbers
• 1769. Minimum Number of Operations to Move All Balls to Each Box
• 1791. Find Center of Star Graph
• 1863. Sum of All Subset XOR Totals
• 19. Remove Nth Node From End of List
• 198. House Robber
• 2044. Count Number of Maximum Bitwise-OR Subsets
• 208. Implement Trie (Prefix Tree)
• 215. Kth Largest Element in an Array
• 22. Generate Parentheses
• 222. Count Complete Tree Nodes
• 230. Kth Smallest Element in a BST
• 235. Lowest Common Ancestor of a Binary Search Tree
• 236. Lowest Common Ancestor of a Binary Tree
• 238. Product of Array Except Self
• 257. Binary Tree Paths
• 2807. Insert Greatest Common Divisors in Linked List
• 297. Serialize and Deserialize Binary Tree
• 36. Valid Sudoku
• 37. Sudoku Solver
• 386. Lexicographical Numbers
• 39. Combination Sum
• 394. Decode String
• 42. Trapping Rain Water
• 46. Permutations
• 48. Rotate Image
• 49. Group Anagrams
• 5. Longest Palindromic Substring
• 51. N-Queens
• 53. Maximum Subarray
• 54. Spiral Matrix
• 6. Zigzag Conversion
• 62. Unique Paths
• 621. Task Scheduler
• 78. Subsets
• 852. Peak Index in a Mountain Array
• 869. Reordered Power of 2
• 90. Subsets II
• 94. Binary Tree Inorder Traversal
• 973. K Closest Points to Origin
• 98. Validate Binary Search Tree

Hard Problems

• 51. N-Queens
• 37. Sudoku Solver