944. Delete Columns to Make SortedWe are given an array A of N lowercase letter strings, all of the same length.Now, we

942. DI String MatchGiven a string S that only contains “I” (increase) or “D” (decrease), let N = S.length.Return any pe

929. Unique Email AddressesEvery email consists of a local name and a domain name, separated by the @ sign.For example,

922. Sort Array By Parity IIGiven an array A of non-negative integers, half of the integers in A are odd, and half of th

905. Sort Array By ParityGiven an array A of non-negative integers, return an array consisting of all the even elements

867. Transpose MatrixGiven a matrix A, return the transpose of A.The transpose of a matrix is the matrix flipped over it

852. Peak Index in a Mountain ArrayLet’s call an array A a mountain if the following properties hold: A.length >= 3

832. Flipping an ImageGiven a binary matrix A, we want to flip the image horizontally, then invert it, and return the re

807. Max Increase to Keep City SkylineIn a 2 dimensional array grid, each value grid[i][j] represents the height of a bu

804. Unique Morse Code WordsInternational Morse Code defines a standard encoding where each letter is mapped to a series

771. Jewels and StonesYou’re given strings Jrepresenting the types of stones that are jewels, and S representing the sto

709. To Lower CaseImplement function ToLowerCase() that has a string parameter str, and returns the same string in lower