CF429E Points and Segments

Iahub isn't well prepared on geometry problems, but he heard that this year there will be a lot of geometry problems on the IOI selection camp. Scared, Iahub locked himself in the basement and started thinking of new problems of this kind. One of them is the following. Iahub wants to draw $ n $ distinct segments $ [l_{i},r_{i}] $ on the $ OX $ axis. He can draw each segment with either red or blue. The drawing is good if and only if the following requirement is met: for each point $ x $ of the $ OX $ axis consider all the segments that contains point $ x $ ; suppose, that $ r_{x} $ red segments and $ b_{x} $ blue segments contain point $ x $ ; for each point $ x $ inequality $ |r_{x}-b_{x}|

N/A

N/A