摘要：
Almost Acyclic Graph "CodeForces 915D " time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Y 阅读全文
摘要：
Yukino With Subinterval Yukino has an array a_1, a_2 \cdots a_n a 1, a 2⋯ a n . As a tsundere girl, Yukino is fond of studying subinterval. Today, she 阅读全文