번호	제목
7823	Counting BST
7824	Playing With Stones
7825	Arm Wrestling Tournament
7826	Lightning Energy Report
7827	Transitive Closure
7828	더해
7829	Serial Numbers
7830	Romantic Date
7831	Fire Drill
7839	Pizza schedule
7840	Texture Tile
7841	Count Squares
7842	Road Accident
7843	Terrarium
7844	Sudoku Checker
7845	ACM Computer Factory
7846	ACM Rank Table
7847	Sales Report
7848	Random Gap
7849	Radio Coverage