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Tic-Tac-Toe, sometimes also known as Xs and Os, is a game for two players (X and O) who take turns marking the spaces in a 3×3 grid. The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal rows (NW-SE and NE-SW) wins the game. But we will not be playing this game. You will be the referee for this games results. You are given a result of a game and you mus..

Stephan has a friend who happens to be a little mechbird. Recently, he was trying to teach it how to speak basic language. Today the bird spoke its first word: "hieeelalaooo". This sounds a lot like "hello", but with too many vowels. Stephan asked Nikola for help and he helped to examine how the bird changes words. With the information they discovered, we should help them to make a translation m..

Every true traveler must know how to do 3 things: fix the fire, find the water and extract useful information from the nature around him. Programming won't help you with the fire and water, but when it comes to the information extraction - it might be just the thing you need. Your task is to find the angle of the sun above the horizon knowing the time of the day. Input data: the sun rises in the..

There are four substring missions that were born all in one day and you shouldn’t be needed more than one day to solve them. All of those mission can be simply solved by brute force, but is it always the best way to go? (you might not have access to all of those missions yet, but they are going to be available with more opened islands on the map). This mission is the first one of the series. Her..

Nicola likes to categorize all sorts of things. He categorized a series of numbers and as the result of his efforts, a simple sequence of numbers became a deeply-nested list. Sophia and Stephan don't really understand his organization and need to figure out what it all means. They need your help to understand Nikolas crazy list. There is a list which contains integers or other nested lists which..

Sort the given iterable so that its elements end up in the decreasing frequency order, that is, the number of times they appear in elements. If two elements have the same frequency, they should end up in the same order as the first appearance in the iterable. Input: Iterable Output: Iterable Example: frequency_sort([4, 6, 2, 2, 6, 4, 4, 4]) == [4, 4, 4, 4, 6, 6, 2, 2] frequency_sort(['bob', 'bob..

If you have 50 different plug types, appliances wouldn't be available and would be very expensive. But once an electric outlet becomes standardized, many companies can design appliances, and competition ensues, creating variety and better prices for consumers. -- Bill Gates You are given a non-empty list of integers (X). For this task, you should return a list consisting of only the non-unique e..

You prefer a good old 12-hour time format. But the modern world we live in would rather use the 24-hour format and you see it everywhere. Your task is to convert the time from the 24-h format into 12-h format by following the next rules: - the output format should be 'hh:mm a.m.' (for hours before midday) or 'hh:mm p.m.' (for hours after midday) - if hours is less than 10 - don't write a '0' bef..

You are given a text, which contains different english letters and punctuation symbols. You should find the most frequent letter in the text. The letter returned must be in lower case. While checking for the most wanted letter, casing does not matter, so for the purpose of your search, "A" == "a". Make sure you do not count punctuation symbols, digits and whitespaces, only letters. If you have t..

Stephan and Sophia forget about security and use simple passwords for everything. Help Nikola develop a password security check module. The password will be considered strong enough if its length is greater than or equal to 10 symbols, it has at least one digit, as well as containing one uppercase letter and one lowercase letter in it. The password contains only ASCII latin letters or digits. ​ ..