All Posts

Leetcode 543: Diameter of Binary Tree

Given the root of a binary tree, return the length of the diameter of the tree. The diameter of a binary tree is the length of the longest path between any two nodes, which may or may not pass through the root.

Sep 13, 2024 - 5 min read

Leetcode 557: Reverse Words in a String III

Given a string s, reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Sep 12, 2024 - 5 min read

Leetcode 572: Subtree of Another Tree

Given the roots of two binary trees, root and subRoot, return true if there is a subtree of root with the same structure and node values of subRoot and false otherwise. A subtree of a binary tree consists of a node in the tree and all of this node’s descendants.

Sep 10, 2024 - 6 min read

Leetcode 589: N-ary Tree Preorder Traversal

Given the root of an n-ary tree, return the preorder traversal of its nodes’ values. In one step, the node is visited first, followed by its children from left to right. The input is serialized in a level order format where each group of children is separated by a null value.

Sep 9, 2024 - 5 min read

Leetcode 617: Merge Two Binary Trees

Given two binary trees, merge them into a new binary tree where overlapping nodes are summed, and non-overlapping nodes are retained as they are.

Sep 6, 2024 - 5 min read

Leetcode 645: Set Mismatch

You are given a list of integers that should originally represent all numbers from 1 to n. However, one number appears twice and another number is missing. Your task is to find the number that is duplicated and the one that is missing.

Sep 3, 2024 - 5 min read