번호	제목
20776	Action Recognition Problem
20777	Bridge
20778	Combine The Gears
20779	Desk in Heartstone
20780	Evil Problemsetters
20781	Fewest Moves Count
20782	Game With Stones
20783	Hotels
20784	Internet Chats
20785	Julius Caesar and Kazusa
20786	Key Management
20787	Light Version Of Famous Task
20788	Arrange and Count!
20789	Build More 2020's!
20790	Choose Two Subsequences
20791	Determinant Strikes Back
20792	Efficient Data Structure
20793	Fibonnacci Suffix Array
20794	Greatest Square
20795	Hamming Distance