번호	제목
19726	Magic Trick
19727	Superpermutations
19728	Preparing Tests
19729	Valya and Letter
19730	Sightseeing Tour
19731	How to Fail at Programming Contest
19732	Berland Railroads
19733	Difficult Problems
19734	Race of robots
19735	Flexible Segments
19736	Secret Code
19737	Torus Travel
19738	Amalthea's new walk
19739	Formula 42
19740	How Many Tests
19741	Patterns
19742	Interesting excursion
19743	Jump and turn
19744	Counting in the order
19745	Different digits