Given an array of positive integers nums and a positive number target, find the length of the smallest contiguous subarray whose sum is

Given an array of positive numbers and a positive number 'k', find the maximum sum of any contiguous subarray of size 'k'.

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.