Pattern Syntax Checker Hackerrank Using Regex, we can easily match or search for patterns in a text. Before searching for a pattern, we have to specify one using some well-defined syntax. In this problem, you are given a pattern. You have to check whether the syntax of the given pattern is valid. Note: In this problem, a regex is only valid if you can compile it using the Pattern.compile method. Input Format The first line of input contains an integer …

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Ice Cream Parlor Hackerrank Each time Sunny and Johnny take a trip to the Ice Cream Parlor, they pool together m dollars for ice cream. On any given day, the parlor offers a line of n flavors. Each flavor, i, is numbered sequentially with a unique ID number from 1 to n and has a cost, ci, associated with it. Given the value of m and the cost of each flavor for t trips to the Ice Cream Parlor, help …

Given N integers, count the number of pairs of integers whose difference is K. Input Format The first line contains N and K. The second line contains N numbers of the set. All the N numbers are unique. Constraints 2<=N<=105 0<=K<=109 Each integer will be greater than 0 and at least K smaller than 231-1. Output Format An integer that tells the number of pairs of integers whose difference is K. <strong>Sample Input</strong> 5 2 1 5 3 4 2 …

At HackerLand University, a passing grade is any grade 40 points or higher on a 100 point scale. Sam is a professor at the university and likes to round each student’s grade according to the following rules: If the difference between the grade and the next higher multiple of 5 is less than 3, round to the next higher multiple of 5 If the grade is less than 38, don’t bother as it’s still a failing grade Automate the rounding …

Birthday Cake Candles Hackerrank problem solution -coderInme You are in-charge of the cake for your niece’s birthday and have decided the cake will have one candle for each year of her total age. When she blows out the candles, she’ll only be able to blow out the tallest ones. Your task is to find out how many candles she can successfully blow out. For example, if your niece is turning 4 years old, and the cake will have 4 candles of height 3, 2, 1, 3, she …

Time Conversion Given a time in 12-hour AM/PM format, convert it to military (24-hour) time. Note: Midnight is 12:00:00AM on a 12-hour clock, and 00:00:00 on a 24-hour clock. Noon is 12:00:00PM on a 12-hour clock, and 12:00:00 on a 24-hour clock. Input Format A single string containing a time in 12-hour clock format (i.e.: hh:mm:ssAM or hh:mm:ssPM), where 01

Angry Professor Hackerrank A Discrete Mathematics professor has a class of N students. Frustrated with their lack of discipline, he decides to cancel class if fewer than K students are present when class starts. Given the arrival time of each student, determine if the class is canceled. Input Format The first line of input contains T, the number of test cases. Each test case consists of two lines. The first line has two space-separated integers, N(students in the class) and …