Suggested problems

Microsoft Windows 10 Pro Key

May 22, 2022, 7:30 a.m. by zombara

Biological Motivation

Product Details Brand: Microsoft Availability: In Stock Delivery: Key – Instructions will be emailed. Delivery time from 30 minutes to 6 hours. Language: Multi-language.

Key Windows 10 Pro 32/64 bit used permanently on one machine. Reinstalling win is still active License Period: Lifetime ...


A string is simply an ordered collection of symbols selected from some alphabet and formed into a word; the length of a string is the number of symbols that it contains.

An example of an DNA string (whose alphabet contains the symbols A, C, G, and T) is ATGCTTCAGAAAGGTCTTACG.

Given: A DNA string $s$ of length at most 1000 nucleotides.

Return: Four integers corresponding to the number of times that the symbols A, C, G, and T occur in $s$.

Sample Dataset


Sample Output

20 12 17 21