Problem set
Recursion questions
58 matching · 27 easy · 26 medium · 5 hard
- 02Add Two NumbersMedium
- 10Regular Expression MatchingHard
- 21Merge Two Sorted ListsEasy
- 24Swap Nodes in PairsMedium
- 25Reverse Nodes in k-GroupHard
- 50Pow(x, n)Medium
- 60Permutation SequenceHard
- 94Binary Tree Inorder TraversalEasy
- 98Validate Binary Search TreeMedium
- 100Same TreeEasy
- 101Symmetric TreeEasy
- 104Maximum Depth of Binary TreeEasy
- 110Balanced Binary TreeEasy
- 111Minimum Depth of Binary TreeEasy
- 112Path SumEasy
- 124Binary Tree Maximum Path SumHard
- 129Sum Root to Leaf NumbersMedium
- 144Binary Tree Preorder TraversalEasy
- 145Binary Tree Postorder TraversalEasy
- 183Remove Linked List ElementsEasy
- 186Reverse Linked ListEasy
- 202Count Complete Tree NodesEasy
- 206Invert Binary TreeEasy
- 216Lowest Common Ancestor of a Binary TreeMedium
- 221Different Ways to Add ParenthesesMedium
- 242Integer to English WordsHard
- 260Binary Tree Longest Consecutive SequenceMedium
- 278Power of ThreeEasy
- 286Nested List Weight SumMedium
- 304Nested List Weight Sum IIMedium
- 305Find Leaves of Binary TreeMedium
- 321Lexicographical NumbersMedium
- 327Decode StringMedium
- 333Sum of Left LeavesEasy
- 381Predict the WinnerMedium
- 391Fibonacci NumberEasy
- 404Construct Binary Tree from StringMedium
- 405Convert BST to Greater TreeMedium
- 410Diameter of Binary TreeEasy
- 411Boundary of Binary TreeMedium
- 417Binary Tree TiltEasy
- 420Subtree of Another TreeEasy
- 424N-ary Tree Preorder TraversalEasy
- 426Construct String from Binary TreeEasy
- 429Merge Two Binary TreesEasy
- 446Maximum Binary TreeMedium
- 450Trim a Binary Search TreeMedium
- 458Longest Univalue PathMedium
- 485Flood FillEasy
- 517Keys and RoomsMedium
- 532Smallest Subtree with all the Deepest NodesMedium
- 535Leaf-Similar TreesEasy
- 545Increasing Order Search TreeEasy
- 560Range Sum of BSTEasy
- 567Flip Equivalent Binary TreesMedium
- 589Construct Binary Search Tree from Preorder TraversalMedium
- 599Delete Nodes And Return ForestMedium
- 625Count Good Nodes in Binary TreeMedium