Tests classification:

Range:
	* 00
		- test from problem example
	* 01-05
		- handmade tests
	* 05-10
		- small tests (N <= 100), random
	* 11-15
		- middle tests (N <= 500), random 
	* 16-20
		- hard big tests (all included)
    * 21-25
    	- stupid big tests