This extension filters the standings for a given contest on Codeforces to show only active competitors of a specific country...
CF World Standings 更新
CF World Standings 简介
All the countries with more than 5 active users are listed and the lists are updated every weekend. Unfortunately, Codeforces does not allow us to have a list with more than 1000 users. In those cases, we give preference for active users (those who played a contest in the last month) and those with higher ratings.