Alice has a hand of cards, given as an array of integers. Now she wants to rearrange the cards into groups so that each group is size W, and consists ...

Given an array of integers nums and a positive integer k, find whether it’s possible to divide this array into sets of k consecutive numbersReturn Tru ...

Given the root of a binary tree, each node in the tree has a distinct value. After deleting all nodes with a value in to_delete, we are left with a fo ...

You are asked to cut off trees in a forest for a golf event. The forest is represented as a non-negative 2D map, in this map: 0 represents the obstac ...

Given an undirected tree consisting of n vertices numbered from 1 to n. A frog starts jumping from the vertex 1. In one second, the frog jumps from it ...

Given a single positive integer x, we will write an expression of the form x (op1) x (op2) x (op3) x … where each operator op1, op2, etc. is either ad ...

Given a non-empty array of unique positive integers A, consider the following graph: There are A.length nodes, labelled A[0] to A[A.length - 1]; Ther ...

Given an array A of strings, find any smallest string that contains each string in A as a substring. We may assume that no string in A is substring of ...

You are given an array of variable pairs equations and an array of real numbers values, where equations[i] = [Ai, Bi] and values[i] represent the equa ...

In a N x N grid composed of 1 x 1 squares, each 1 x 1 square consists of a /, \, or blank space. These characters divide the square into contiguous r ...