CS494 -- Lab 0

Part 1

Do the 250 point problem from D1 in Topcoder SRM 639 (AliceGame). However, you need to be able to handle x+y < 263. To hand this in, submit a file that implements the appropriate class and method. The TA will compile this with his own testing main() to grade it.

You can compare your code with the executable Alice in the lab directory, which takes the two numbers on the command line. For example:

UNIX> cd /home/plank/cs494/labs/Lab-0
UNIX> Alice 17 8
UNIX> Alice 5000 5000
UNIX> Alice 500000000000000000 500000000000000000
UNIX> time Alice 500000000000000000 500000000000000000
0.000u 0.000s 0:00.00 0.0%	0+0k 0+0io 0pf+0w
If you'd like some good examples to try, see Alice-Test.sh. Also, the PDF of my presentation on this problem is in http://web.eecs.utk.edu/~plank/plank/classes/cs494/494/notes/Alice/AliceGame.pdf.

Part 2

Do the 500 point problem from D1 in Topcoder SRM 639 (BoardFolding). However, the constraints on N and M are now that they are <= 3000. For this to work, you'll need to make sure that StartingPlaces is indeed O(N2) in the worst case. You should also convert the vector of strings into a vector of integers, as described in the presentation. Finally, you should make the method return a long long rather than an integer.

I have three executables in the lab directory, Board-Fast, Board-Medium and Board-Slow. Both take the uncompressed board on standard input. The slow version is the one I submitted to topcoder, which doesn't optimize, and has StartingPlaces be O(n3). The medium one has StartingPlaces be O(n2), but doesn't convert the board to ints. The fast one works like the medium one, only it now converts the board to ints.

I have some big boards in the files BF*.txt. The most challenging is BF7.txt.

UNIX> wc BF7.txt
   3000    3000 9003000 BF7.txt
UNIX> time Board-Medium < BF7.txt
6.920u 0.096s 0:07.03 99.7%	0+0k 17640+0io 1pf+0w
UNIX> time Board-Fast < BF7.txt
0.780u 0.044s 0:00.83 98.7%	0+0k 72+0io 1pf+0w
Also, in 2015, Adam Disney, who TA'd the class, created a bunch of example boards. These are in the directory /home/plank/cs494/labs/Lab-0/Disney_Boards. The files xxx.cli hold N and M, and the files xxx.txt hold the compressed board. As Adam said last year, he left some "Easter Eggs" in the boards, so if you're curious, take a look, because they are pretty amusing. For example, here's the input board for file 010.cli/010.txt, where I converted the 0's and 1's into a PGM file, and then to a JPG:

He also wrote the program compress.cpp, which turns 0's and 1's into the compressed format of the problem.

The PDF of my presentation on this problem is in http://web.eecs.utk.edu/~plank/plank/classes/cs494/494/notes/Presentations/BoardFolding.pdf.


Your TA will tell you how to submit your labs. You should submit the two cpp files (AliceGame.cpp and BoardFolding.cpp), which do not have mains compiled in.

Your code should have comments and be written so that it reads easily.

You'll note -- no grading script and no pre-written main(). You'll have to write your own main() for testing, and our TA needs to learn how to write some good shell scripts.... You can use topcoder to help you test, though.