МКН Александр Куликов. Выполнимость: задача на миллион. 4. Самая трудная из трудных задач

New channel Факультет математики и компьютерных наук СПбГУ: title sample judged 'pick' (Many genuine research lectures and olympiad problem breakdowns qualify, but the channel is mixed with open-day marketing); 2 of 3 sampled transcripts showed teaching, 0 not; titles picked one by one, checked strictly; oEmbed verified.