Given an integer array height[] where height[i] represents the height of the i-th stair, a frog starts from the first stair and wants to reach the top. From any…
Browsing: Beginner
Implement a last-in-first-out (LIFO) stack using only two queues. The implemented stack should support all the functions of a normal…
Problem Statement You need to implement a queue using an array (Python list works as an array here). The queue should support…
You need to implement a stack using an array (Python list works as an array here). The stack should support two main…
You are climbing a staircase with n steps. It takes n steps to reach the top. Each time you can either climb 1 or…
Given a non-negative integer n, your task is to find the nth Fibonacci number. The Fibonacci sequence is a sequence where the next term is the…
Given a non-empty array of integers nums, every element appears twice except for one. Find that single one. You must implement a solution with a linear…
A bit flip of a number x is choosing a bit in the binary representation of x and flipping it from either 0 to 1 or 1 to 0. Given two integers start and goal, return the minimum number of bit flips to…
Welcome to our detailed guide on bit manipulation problems! If you’re preparing for coding interviews or just want to strengthen…
Given a doubly linked list. Your task is to reverse the doubly linked list and return its head. Here’s the [Problem Link] to…