北大点猫联合实验室 邀请赛 05 （noip组）

Contest rules

• · Compiler: B: C++17, C: C++17, D: C++17
• · IOI format: your final score is taken from your highest-scoring submission
• · Partial scores by subtask
• · Scores are shown live
• · Dynamic timing: start any time in the open window; you have 270 minutes
• · Programming: pick the problem and files on the submit page; the open file is not submitted automatically
• · Answering stops at the deadline; only submitted versions count
• · No discussing problems online during the contest