Koala and Lights

2020 VietMX 0

It is a holiday season, and Koala is decorating his house with cool lights! He owns $n$ lights, all of which flash periodically. After taking […]

Koala and Notebook

2020 VietMX 0

Koala Land consists of $m$ bidirectional roads connecting $n$ cities. The roads are numbered from $1$ to $m$ by order in input. It is guaranteed, […]