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Solved problems
JOI17_city
COI16_dijament
COI16_palinilap
COI16_torrent
COI18_svjetlost
COCI20_psk
COCI20_spiderman
COCI20_nivelle
IOI20_supertrees
IOI20_tickets
IOI20_stations
Submitted but unsolved problems
IOI20_biscuits