在2维矩阵中通过随机抽样选定占据的格点，再将占据的格点标号，相邻的格点为同一标号-in two-dimensional matrix randomly selected to occupy the grid, and then occupy the grid label, adjacent to the grid for the same grade

2维弹道沉积，自己设计的方案让点落下并沉积在下方，落在何处用随机抽样-two-dimensional ballistic deposition, a program designed to let the fallen and deposited on the bottom, where they fell by random