Hey students! If you’re diving into recursion and backtracking, the “Subsets” problem (also known as generating the power set or all subsequences) is a perfect starting point. It’s like deciding…
Browsing: Intermediate
You are given two integers L and R, your task is to find the XOR of elements of the range…
Given an integer array nums of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate subsets. Return the solution in any order. Here’s…
Given the head of a sorted doubly linked list, remove all duplicate nodes from the list. Each node should appear only once…
Given a sorted doubly linked list and a target sum, find all pairs of nodes whose sum equals the target. Return…
Given a doubly linked list and a key, delete all occurrences of the given key from the doubly linked list. Here’s…
You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes…
You are given a linked list that represents a number. Each node contains a single digit, and the digits are stored in…
Given the head of a linked list where nodes can contain values 0s, 1s, and 2s only. Your task is to rearrange the list so that all 0s appear at the beginning,…
You are given the head of a linked list. Delete the middle node, and return the head of the modified linked list. The middle node of a linked list of…