Discussion on question by Артём: Поиск подмассива с заданной суммой

Imported from a comment discussion on https://ru.stackoverflow.com/questions/1599479/%d0%9f%d0%be%d0%b8%d1%81%d0%ba-%d0%bf%d0%be%d0%b4%d0%bc%d0%b0%d1%81%d1%81%d0%b8%d0%b2%d0%b0-%d1%81-%d0%b7%d0%b0%d0%b4%d0%b0%d0%bd%d0%bd%d0%be%d0%b9-%d1%81%d1%83%d0%bc%d0%bc%d0%be%d0%b9