change the format of input
Merge branch 'master' of github.com:randhawa90/hps

Conflicts:
	ambulance/main.cpp
Merge branch 'master' of github.com:randhawa90/hps
Add a set color method to grid
Change the method that the grid set color of grain

Use a block-based estimation. Set the block to 40*40 and get the colors
for five points of this block(center, upright, upleft, downright,
    dowleft). If this five colors are identical, the whole block is
colored by this color. If not, do computation on every single particle.
Add a greedy algorithm to get the next move

Iterate all the points in the grid is not practical due to enormous
computation. We still use the block-based way to do this.