번호	제목
7850	Circle Drawing
7851	Harder Sokoban Problem
7852	Nearest number - 2
7853	Advanced ASCII Cubes
7854	Water pipe
7855	One is good, but two is better
7856	Beach cut
7857	Simple prefix compression
7858	Tetris Alphabet
7859	Network Saboteur
7860	Burned Calendar
7861	Longest Ordered Subsequence
7862	Falling cards
7863	Very Simple Problem
7864	Binary Witch
7865	Fool Game
7866	Spreadsheet
7867	PreQueL
7868	해밍 수열
7869	두 원