Data Structure (Basic)A beginner-friendly study plan for arrays, strings, linked lists, stacks, queues, and trees.Start Practicing: https://leetcode.com/study-plan/data-structureProblem NameDifficultySolution Link217. Contains DuplicateEasyView Solutions53. Maximum SubarrayEasyView Solutions1. Two SumEasyView Solutions88. Merge Sorted ArrayEasyView Solutions350. Intersection of Two Arrays IIEasyN/A121. Best Time to Buy and Sell StockEasyView Solutions566. Reshape the MatrixEasyN/A118. Pascal's TriangleEasyView Solutions36. Valid SudokuMediumView Solutions74. Search a 2D MatrixMediumView Solutions387. First Unique Character in a StringEasyN/A383. Ransom NoteEasyView Solutions242. Valid AnagramEasyView Solutions141. Linked List CycleEasyView Solutions21. Merge Two Sorted ListsEasyN/A203. Remove Linked List ElementsEasyN/A206. Reverse Linked ListEasyView Solutions83. Remove Duplicates from Sorted ListEasyN/A20. Valid ParenthesesEasyView Solutions232. Implement Queue using StacksEasyN/A144. Binary Tree Preorder TraversalEasyView Solutions94. Binary Tree Inorder TraversalEasyView Solutions145. Binary Tree Postorder TraversalEasyView Solutions102. Binary Tree Level Order TraversalEasyView Solutions104. Maximum Depth of Binary TreeEasyView Solutions101. Symmetric TreeEasyView Solutions226. Invert Binary TreeEasyView Solutions112. Path SumEasyView SolutionsProgramming Skills (Basic)A beginner-friendly study plan for basic math, implementation, strings, arrays, and control flow.Heap (Priority Queue)Practice heap and priority queue problems for ordering, top-k queries, scheduling, and streaming data.