Tree Problems (97) | Code While Coffee

📄️ All Nodes Distance K in Binary Tree

LeetCode 893 | Difficulty: Medium

📄️ Average of Levels in Binary Tree

LeetCode 637 | Difficulty: Easy

📄️ Balanced Binary Tree

LeetCode 110 | Difficulty: Easy

📄️ Binary Search Tree Iterator

LeetCode 173 | Difficulty: Medium

📄️ Binary Tree Cameras

LeetCode 1008 | Difficulty: Hard

📄️ Binary Tree Inorder Traversal

LeetCode 94 | Difficulty: Easy

📄️ Binary Tree Inorder Traversal

LeetCode 94 | Difficulty: Easy

📄️ Binary Tree Level Order Traversal

LeetCode 102 | Difficulty: Medium

📄️ Binary Tree Level Order Traversal II

LeetCode 107 | Difficulty: Medium

📄️ Binary Tree Longest Consecutive Sequence

LeetCode Link

📄️ Binary Tree Paths

LeetCode 257 | Difficulty: Easy

📄️ Binary Tree Postorder Traversal

LeetCode 145 | Difficulty: Easy

📄️ Binary Tree Preorder Traversal

LeetCode 144 | Difficulty: Easy

📄️ Binary Tree Right Side View

LeetCode 199 | Difficulty: Medium

📄️ Binary Tree Tilt

LeetCode 563 | Difficulty: Easy

📄️ Binary Tree Vertical Order Traversal

LeetCode Link

📄️ Binary Tree Zigzag Level Order Traversal

LeetCode 103 | Difficulty: Medium

📄️ Boundary of Binary Tree

LeetCode Link

📄️ Check Completeness of a Binary Tree

LeetCode 998 | Difficulty: Medium

📄️ Closest Binary Search Tree Value

LeetCode Link

📄️ Construct Binary Tree from Inorder and Postorder Traversal

LeetCode 106 | Difficulty: Medium

📄️ Construct Binary Tree from Preorder and Inorder Traversal

LeetCode 105 | Difficulty: Medium

📄️ Construct Binary Tree from Preorder and Inorder Traversal

LeetCode 105 | Difficulty: Medium

📄️ Convert Binary Search Tree to Sorted Doubly Linked List

LeetCode Link

📄️ Convert Sorted Array to Binary Search Tree

LeetCode 108 | Difficulty: Easy

📄️ Convert Sorted List to Binary Search Tree

LeetCode 109 | Difficulty: Medium

📄️ Correct a Binary Tree

LeetCode Link

📄️ Count Binary Substrings

LeetCode 696 | Difficulty: Easy

📄️ Count Complete Tree Nodes

LeetCode 222 | Difficulty: Easy

📄️ Count Good Nodes in Binary Tree

LeetCode 1544 | Difficulty: Medium

📄️ Count Number of Homogenous Substrings

LeetCode 1885 | Difficulty: Medium

📄️ Count Univalue Subtrees

LeetCode Link

📄️ Cousins in Binary Tree

LeetCode 1035 | Difficulty: Easy

📄️ Delete Node in a BST

LeetCode 450 | Difficulty: Medium

📄️ Diameter of Binary Tree

LeetCode 543 | Difficulty: Easy

📄️ Distribute Coins in Binary Tree

LeetCode 1021 | Difficulty: Medium

📄️ Find Bottom Left Tree Value

LeetCode 513 | Difficulty: Medium

📄️ Find Largest Value in Each Tree Row

LeetCode 515 | Difficulty: Medium

📄️ Find Leaves of Binary Tree

LeetCode Link

📄️ Flatten Binary Tree to Linked List

LeetCode 114 | Difficulty: Medium

📄️ Graph Valid Tree

LeetCode Link

📄️ Implement Trie (Prefix Tree)

LeetCode 208 | Difficulty: Medium

📄️ Inorder Successor in BST

LeetCode Link

📄️ Insert into a Binary Search Tree

LeetCode 784 | Difficulty: Medium

📄️ Invert Binary Tree

LeetCode 226 | Difficulty: Easy

📄️ Kth Smallest Element in a BST

LeetCode 230 | Difficulty: Medium

📄️ Longest Palindromic Substring

LeetCode 5 | Difficulty: Medium

📄️ Longest Substring with At Least K Repeating Characters

LeetCode 395 | Difficulty: Medium

📄️ Longest Substring with At Most K Distinct Characters

LeetCode Link

📄️ Longest Substring with At Most Two Distinct Characters

LeetCode Link

📄️ Longest Substring Without Repeating Characters

LeetCode 3 | Difficulty: Medium

📄️ Lowest Common Ancestor of a Binary Search Tree

LeetCode 235 | Difficulty: Medium

📄️ Lowest Common Ancestor of a Binary Tree

LeetCode 236 | Difficulty: Medium

📄️ Maximum Depth of Binary Tree

LeetCode 104 | Difficulty: Easy

📄️ Maximum Depth of N-ary Tree

LeetCode 774 | Difficulty: Easy

📄️ Merge Two Binary Trees

LeetCode 617 | Difficulty: Easy

📄️ Minimum Absolute Difference in BST

LeetCode 530 | Difficulty: Easy

📄️ Minimum Depth of Binary Tree

LeetCode 111 | Difficulty: Easy

📄️ Minimum Distance Between BST Nodes

LeetCode 799 | Difficulty: Easy

📄️ Minimum Number of Swaps to Make the String Balanced

LeetCode 2095 | Difficulty: Medium

📄️ Minimum Path Sum

LeetCode 64 | Difficulty: Medium

📄️ Minimum Window Substring

LeetCode 76 | Difficulty: Hard

📄️ Modification

Populate Next Right Pointers in Each Node

📄️ N-ary Tree Level Order Traversal

LeetCode 764 | Difficulty: Medium

📄️ N-ary Tree Postorder Traversal

LeetCode 776 | Difficulty: Easy

📄️ N-ary Tree Preorder Traversal

LeetCode 775 | Difficulty: Easy

📄️ Next Palindrome Using Same Digits

LeetCode Link

📄️ Number of Substrings Containing All Three Characters

LeetCode 1460 | Difficulty: Medium

📄️ Number of Substrings With Only 1s

LeetCode 1636 | Difficulty: Medium

📄️ Palindromic Substrings

LeetCode 647 | Difficulty: Medium

📄️ Path Sum

LeetCode 112 | Difficulty: Easy

📄️ Path Sum II

LeetCode 113 | Difficulty: Medium

📄️ Range Sum of BST

LeetCode 975 | Difficulty: Easy

📄️ Recover the Original Array

LeetCode 2241 | Difficulty: Hard

📄️ Repeated Substring Pattern

LeetCode 459 | Difficulty: Easy

📄️ Same Tree

LeetCode 100 | Difficulty: Easy

📄️ Same Tree

LeetCode 100 | Difficulty: Easy

📄️ Search in a Binary Search Tree

LeetCode 783 | Difficulty: Easy

📄️ Second Minimum Node In a Binary Tree

LeetCode 671 | Difficulty: Easy

📄️ Serialize and Deserialize Binary Tree

LeetCode 297 | Difficulty: Hard

📄️ Serialize and Deserialize BST

LeetCode 449 | Difficulty: Medium

📄️ Serialize and Deserialize N-ary Tree

LeetCode Link

📄️ Split BST

LeetCode Link

📄️ Substring with Concatenation of All Words

LeetCode 30 | Difficulty: Hard

📄️ Substrings That Begin and End With the Same Letter

LeetCode Link

📄️ Subtree of Another Tree

LeetCode 572 | Difficulty: Easy

📄️ Sum of Distances in Tree

LeetCode 863 | Difficulty: Hard

📄️ Sum Root to Leaf Numbers

LeetCode 129 | Difficulty: Medium

📄️ Symmetric Tree

LeetCode 101 | Difficulty: Easy

📄️ Two Sum BSTs

LeetCode Link

📄️ Unique Binary Search Trees

LeetCode 96 | Difficulty: Medium

📄️ Unique Binary Search Trees II

LeetCode 95 | Difficulty: Medium

📄️ Univalued Binary Tree

LeetCode 1005 | Difficulty: Easy

📄️ Validate Binary Search Tree

LeetCode 98 | Difficulty: Medium

📄️ Verify Preorder Sequence in Binary Search Tree

LeetCode Link

📄️ Vertical Order Traversal of a Binary Tree

LeetCode 1029 | Difficulty: Hard

📄️ Zigzag Conversion

LeetCode 6 | Difficulty: Medium