My name is d1312 which means I want to reach 1312 rating at the end of the year. Please tell me how to do that.

I heard STL is a good tool, so I installed STL on my compiler. The problem is, when I use deque, everything is fine. But when I use destack, it gives me this error:

[Error] destack: No such file or directory
compilation terminated.

I'm using the last version of MinGW GCC installed with the MinGW GCC Package Manager, with compile flags -std=c++14 -O2. My friend also have this problem. So please help.

title

I thought here were not many Div.1 rounds in summer vacation, and there have been even less now (the last Div.1 is on August 1st), is there a specific reason for this or just I'm being too impatient?