add stack[] to fit parallelization
add board[] and minor fixs
OpenMP parallelization V1.0
openmp => num_thread(30)
add Path::print()
add stop flag and special case for path len == 0
typesetting
fix MAXSTEP = 15
add magic heuristic
minor improvement
add input6, 7
Added a "buggy" board?
try to merge openmp branch to master
merge complete
try to merge openmp to master