摘要：
[codeforces934E]A Colourful Prospect 试题描述 Firecrackers scare Nian the monster, but they're wayyyyy too noisy! Maybe fireworks make a nice complement. 阅读全文
摘要：
[codeforces934D]A Determined Cleanup 试题描述 In order to put away old things and welcome a fresh new year, a thorough cleaning of the house is a must. Li 阅读全文