We decided to hold a mirror contest of yesterday's finals because there were several requests.

• Contest Link: https://atcoder.jp/contests/wtf19-open
• Start time: February 23rd (Sat), 23:00 JST
• Duration: 4 hours

This contest is unrated, but we want to keep it as fair as possible. Please do not participate in case you already know the problems (e.g., participants of Beijing camp), and do not discuss solutions with others during the contest.

This contest is recommended for reds and very ambitious oranges.