collision-point-sample.mkd

Sample:

1------2-------3----------4-------5--------6--------7
                          XX                        |
                           XX                       |
                            XX                      |
                             XX                     |
                              X---10--------9-------8

Run:

Slow	Fast
1	1
2	3
3	5
4	7
5	9
6	4
7	6
8	8
8	1 (reset)
9	2
10	3
4	4 (collision point)

Explain:

                      the whole cycle path                                                                                           
                                                                                                                                 
                    +--------------------------------------------------------+                                                       
                                                                                                                                 
                      ran path in cycle during 1st meet                                                                               
                                                                                                                                 
                     +-------------------------------+                                                                               
                                                                                                                                 
1------2------3------4(s)------5------6-------7------8------9-------10------11(4)------12(5)-------13(6)-------14(7)---------15(8)(c)
                                                                                                                                 
                                                     +----------------------+ +-------------------------------------------------+    
                                                                                                                                 
                                                      remain cycle            ran path in cycle during 1st meet                      
                                                                                                                                 
                                                     +--------------------------------------------------------------------------+    
                                                                                                                                 
                                                            the whole cycle