You are given an array of distinct integers arr and an array of integer arrays pieces, where the integers in pieces are distinct. Your goal is to form arr by concatenating the arrays in pieces in any order. However, you are not allowed to reorder the integers in each array pieces[i]. Return true if it is possible to …

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This problem was asked by Pinterest. Given an integer list where each number represents the number of hops, you can make, determine whether you can reach to the last index starting at index 0. For example, [2, 0, 1, 0] …

Here’s a new coding problem for today. This problem was asked by Google. Given a sorted list of integers, square the elements and give the output in sorted order. For example, given [-9, -2, 0, 2, 3], return [0, 4, …

This problem was asked by Google. Given a string, return the first recurring character in it, or null if there is no recurring character. For example, given the string “acbbac”, return “b”. Given the string “abcdef”, return null. Solution: To …