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There are n rooms labeled from 0 to n - 1 and all the rooms are locked except for room 0. Your goal is to visit all the rooms. However, ...

Given a root node reference of a BST and a key, delete the node with the given key in the BST. Return the root node reference (possibly ...

You are given the root of a binary search tree (BST) and an integer val. Find the node in the BST that the node's value equals val and r...

Given the root of a binary tree, the level of its root is 1, the level of its children is 2, and so on. Return the smallest level x such...

Given the following shape: [LOG]: " A" [LOG]: " B B" [LOG]: " C C" [LOG]: " D D&qu...

Given the root of a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered f...

Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikiped...

Today, let’s dive into something that’s been buzzing around the tech world: the case of Roy and why it’s a wake-up call for our industry...

In a linked list of size n, where n is even, the ith node (0-indexed) of the linked list is known as the twin of the (n-1-i)th node, if 0

Source: Leetcode.com Given a binary tree root, a node X in the tree is named good if in the path from root to X there are no nodes with ...

Given the head of a singly linked list, group all the nodes with odd indices together followed by the nodes with even indices, and retur...

Write a function that takes a string as input and returns a new string with the words in reverse order. Words are sequences of non-space...

“Collinearity of vectors is the silent language of geometry, where lines speak in unison and points align with purpose.” — Unknown In ...

You have n children, each with a certain number of candies. The number of candies each child has is given in the integer array candies, ...

Let flowerbed be an integer array representing a flowerbed, where 0 denotes an empty plot and 1 denotes a planted plot. Determine whethe...

You are given a string (s), which contains stars (*). In one operation, you can: Choose a star in (s). Remove the closest non-star char...

Given an array of integers nums, calculate the pivot index of this array. The pivot index is the index where the sum of all the numbers ...

Given an array of integers arr, return true if the number of occurrences of each value in the array is unique or false otherwise. Exampl...

We are given an array asteroids of integers representing asteroids in a row. The indices of the asteriod in the array represent their re...

Given a 0-indexed n x n integer matrix grid, return the number of pairs (ri, cj) such that row ri and column cj are equal. A row and col...

Imagine you have a few piles of sticks. Two players take turns picking sticks. On your turn, you must choose one pile and take at least ...

Given two 0-indexed integer arrays nums1 and nums2, return a list answer of size 2 where: answer[0] is a list of all distinct integers ...

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 l...

Two strings are considered close if you can attain one from the other using the following operations: Operation 1: Swap any two existin...

Given the head of a singly linked list, reverse the list, and return the reversed list. Example 1: Input: head = [1,2,3,4,5] Output: [5...

Given the root of a binary tree, return its maximum depth. A binary tree’s maximum depth is the number of nodes along the longest path f...

The Dota2 senate consists of senators coming from two parties. Now the Senate wants to decide on a change in the Dota2 game. The voting ...

Let’s say you have a line of candy pieces, and each piece has a certain number of calories: Candy Line: [2, 5, 1, 8, 3] (These numbers r...

I play on both my laptop and phone, so having a casino that works well on all devices is important. Casino 13 is optimized for mobile gam...