Given a string s, return the number of palindromic substrings in it. A palindrome is a string that reads the same forward and backward. A substring is a contiguous sequence of characters within the string.
In English, certain words can be formed by adding a suffix to a root word. Given a list of root words and a sentence, replace every word in the sentence that is a derivative of any root word with the shortest root. If a word can be formed by more than one root, replace it with the shortest root.
In a Senate made up of senators from two parties, Radiant and Dire, senators can either ban another senator from voting or announce victory if only one party remains with active senators. Predict which party will announce the victory and change the game.
Given a string consisting of ‘(’, ‘)’, and ‘’, determine if the string is valid according to the following rules. ‘’ can be treated as a left parenthesis, a right parenthesis, or an empty string.
