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523
Central Element
Very hard
3948
Just Another Disney Problem
Very hard
7624
Alter Board
9415
XOR
Very hard
10435
Вгадайте число
Very easy
10449
Угадайте перестановку
Medium
10660
Два печива
Easy
10765
Медіанне божевілля
Very easy
10819
Politicians and Competitive Programmers