A solver for the 2x2 rubiks cube also known as pocket cube. Uses a recursive backtracking algortihm with memoization BFS. Usage:

javac *.java  
java -Xms1g Solver

Enter 24 character string of sticker colors according to cube_diagram.png
y-yellow
r-red
g-green
b-blue
w-white
o-orange

ygbgrobgwygyoobwbwroywrr

Shortest solution:
[R, U, U, R, F', U', R, U', F, U', F, U]
Time taken to solve: 17.166000s