
longestSubsequence
You are given a string s , which consists only of the first k letters…
palindromicTwist
You are given a string s of even length consisting of lowercase Latin letters. For each…
romaji
Vitya vừa bắt đầu học ngôn ngữ Berlanese. Được biết, Berlanese sử dụng bảng chữ…
HackIt
Once there was a hacker called Encryptor who used to hack complex things. One time he got…
twoGram
Two-gram is an ordered pair (i.e. string of length two) of capital Latin letters. For…
keyboardLayout
There are two popular keyboard layouts in Berland, they differ only in letters positions. All…
digitHours
Tony loved to watch his digital clock. He spent his days counting the number of…