摘要：
D. Directed Roads D. Directed Roads ZS the Coder and Chris the Baboon has explored Udayland for quite some time. They realize that it consists of n to 阅读全文
摘要：
C. Coloring Trees ZS the Coder and Chris the Baboon has arrived at Udayland! They walked in the park where n trees grow. They decided to be naughty an 阅读全文