1Validate Binary Search TreeMediumTreeDepth-First SearchBinary Search Tree
Solve → 2Path SumEasyTreeDepth-First SearchBreadth-First Search
Solve → 3Distribute Coins in Binary TreeMediumTreeDepth-First SearchBinary Tree
Solve → 4Kth Largest Element in a StreamEasyTreeDesignBinary Search Tree
Solve → 5Count Good Nodes in Binary TreeMediumTreeDepth-First SearchBreadth-First Search
Solve → 6Symmetric TreeEasyTreeDepth-First SearchBreadth-First Search
Solve → 7Binary Tree Level Order TraversalMediumTreeBreadth-First SearchBinary Tree
Solve → 8Binary Tree Zigzag Level Order TraversalMediumTreeBreadth-First SearchBinary Tree
Solve → 9Tree DiameterMediumTreeDepth-First SearchBreadth-First Search
Solve → 10Diameter of N-Ary TreeMediumTreeDepth-First Search
Solve → 11Validate Binary Search TreeMediumTreeDepth-First SearchBinary Search Tree
Solve → 12Path SumEasyTreeDepth-First SearchBreadth-First Search
Solve → 13Binary Tree Level Order TraversalMediumTreeBreadth-First SearchBinary Tree
Solve → 14Distribute Coins in Binary TreeMediumTreeDepth-First SearchBinary Tree
Solve → 15Kth Largest Element in a StreamEasyTreeDesignBinary Search Tree
Solve → 16Count Good Nodes in Binary TreeMediumTreeDepth-First SearchBreadth-First Search
Solve → 17Symmetric TreeEasyTreeDepth-First SearchBreadth-First Search
Solve → 18Binary Tree Zigzag Level Order TraversalMediumTreeBreadth-First SearchBinary Tree
Solve → 19Tree DiameterMediumTreeDepth-First SearchBreadth-First Search
Solve → 20Diameter of N-Ary TreeMediumTreeDepth-First Search
Solve → 21Lowest Common Ancestor of a Binary TreeMediumTreeDepth-First SearchBinary Tree
Solve →