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…

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…

Consider a rat placed at position (0, 0) in an n x n square matrix mat[][]. The rat’s goal is to reach the…

The n-queens puzzle is the problem of placing n queens on an n x n chessboard such that no two queens attack each other. Given an…

Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. Return the answer in any…

Find all valid combinations of k numbers that sum up to n such that the following conditions are true: Return a list of all possible…