https://www.gravatar.com/avatar/8f3abece0f8608ce4b9c1e3212fd1b72?s=240&d=mp

CF1140F-Extending Set of Points

CF1140F-Extending Set of Points 题目: 题目描述: For a given set of two-dimensional points $ S $ , let’s denote its extension $ E(S) $ as the result of the following algorithm: Create another set of two-dimensional points $ R $ , which is initially equal to $ S $ . Then, while there exist four numbers $ x_1 $ , $ y_1 $ ,