Given a string s find the first unique/non-repeating character in it, return its index as result. If it does not exist return -1.

Given an array of integers, temperatures, where each element in the array represents the daily temperature for that day, return an integer

We are given a string s consisting of lower case English letters. Write an algorithm that removes two same/equal adjacent letters from this

Find the longest common prefix from the given array of strings. Return an empty string "", if no common prefix is found.

Convert the given integer to a roman numeral. As we saw in our previous article, roman numerals are represented using seven different

Convert the given roman numeral into an integer value.