I glad to invite to take part in USACO contest is from Dec 13 to 16, remember this contest is IOI style. good luck

This weekend is nice for us, on friday is a Codeforces Round and USACO DEC contest also on saturday is a SRM 600. enjoy

Hello anybody can say me what mean when the problem have a tag two pointers. What mean this approach?

Several coders has got WA on test 26 because the problem statement is ambiguos. The coders had tried all subset using bitmask. Here is the ambiguos text "Your task is to determine if the rectangles form a square. In other words, determine if the set of points inside or on the border of at least one rectangle is precisely equal to the set of points inside or on the border of some square. "

The time of the last two rounds have been very hard for Latin American contestant.

In the last round, I sent the problem B, and not how the system gave me two shipments were exactly the same code. And I lost 50 valuable points for me. someone else did this happen?