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Practice › LeetCode › LeetCode (archived) › LeetCode 09xx ›

LeetCode 979: Distribute Coins in Binary Tree

Problem Restatement We are given the root of a binary tree with n nodes. Each node has some number of coins stored in node.val . There are exactly n coins total in the whole tree, so it is possible for every node to end with exactly one coin. In one move, we may move one coin between two adjacent nodes. Adjacent means parent and child. We need to return the...
leetcode tree binary-tree depth-first-search postorder May 12, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 05xx ›

LeetCode 563: Binary Tree Tilt

Problem Restatement We are given the root of a binary tree. For each node, its tilt is the absolute difference between: Side Meaning Left subtree sum Sum of all values in the left subtree Right subtree sum Sum of all values in the right subtree If a node has no left child, its left subtree sum is 0 . If a node has no right child, its right subtree sum...
leetcode tree binary-tree depth-first-search postorder May 11, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 03xx ›

LeetCode 366: Find Leaves of Binary Tree

Problem Restatement We are given the root of a binary tree. We need to collect the tree's nodes as if we repeatedly do this: Collect all current leaf nodes. Remove those leaf nodes. Repeat until the tree is empty. Return a list of lists. Each inner list contains the node values removed in the same round. The order inside each round does not matter. The official example is: root =...
leetcode tree dfs postorder binary-tree May 10, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 03xx ›

LeetCode 333: Largest BST Subtree

Problem Restatement We are given the root of a binary tree. We need to find the size of the largest subtree that is also a valid Binary Search Tree (BST). The size of a subtree means the number of nodes inside it. A BST follows these rules: Rule Meaning Left subtree All values are smaller than the root Right subtree All values are larger than the root Recursive property Both...
leetcode tree binary-search-tree dfs postorder May 10, 2026