Evaluate Reverse Polish Notation Reverse Polish Notation (RPN) expressions are evaluated using a stack data structure. When iterating through the expression tokens, operands are pushed onto the stack. Upon encountering an operator, the top two operands are popped, the operation is executed, and the...
LeetCode Problem 206: Reverse Linked List Problem Description: Solution: Using a two-pointer approach with previous and current pointers, iteratively modify pointer directions. Pay atttention to the loop termination condition; return the previous pointer as the new head node. /** * Definition for si...
Theory Overview Arrays, sets, and maps are all implementations of hash tables Hash tables excel at determining whether an element has been encountered previously Problem 1: Valid Anagram Problem Link: 242. Valid Anagram - LeetCode Difficulty: Easy Solution Approach: When the chaarcter range is small...
Pruning a Binary Search Tree When removing nodes from a BST that fall outside a specified range [minVal, maxVal], the BST property must be maintained. If a node's value is less than the minimum threshold, the node and its entire left subtree are invalid. The valid result must come from the right sub...
Mathematiacl Operations Reverse Integer Given a signed 32-bit integer, reverse its digits. String Reversal Approach Convert the number to string, reverse it, then convert back: function reverseInteger(x) { let result = 0; if (x >= 0) { result = parseInt(String(x).split('').reverse().join('')); }...
Maximum Binary Tree Construction Given an array of integers, construct a binary tree where each parent node contains the maximum value of its respective subarray. The maximum element becomes the root, with the left subtree built from elements to the left of the maximum, and the right subtree from el...
The canJump function accepts an integer vector nums as input and returns a boolean value indicating weather it is possible to jump from the first element to the last element of the array. Let's analyze this code step by step: Variable Initialization: int maxReach = 0; Here, maxReach represents the f...
Problem Description LeetCode Problem Link: 707. Design Linked List You can choose to use a singly linked list or a doubly linked list to design and implement your own linked list. A node in a singly linked list should have two attributes: val and next. val is the value of the current node, and next...
