yeah, why not just have a try?
the function queryInternal doesn't return anything. Whether it goes wrong?
During Educational Codeforces Round 1 hacking, I found distinct answer for a same code ran in my PC and CF. However, I didn't know why.
Nice problems and nice day. But I still don't know why I get RE on pretest 8 in Problem B div.2 for my first solution.
What a bad day! I did my computer component principle homework about how cpu work the whole day and didn't finish it. That made me not think strictly in round and get a bad rank. I'm so sad. :(
if you ues atan2 for sort with double, it can't get right answer. you should use long double instead. moreover this case made by liao772002.
the new round is too hard to see problem