追赶点和初始段:
[ 2] 2, 1,
[ 5] 4, 5, 3,
[11] 7, 8, 9, 10, 11, 6,
[17] 13, 14, 15, 16, 17, 12,
[23] 19, 20, 21, 22, 23, 18,
[29] 25, 26, 27, 28, 29, 24,
[37] 31, 32, 33, 34, 35, 36, 37, 30,
[41] 39, 40, 41, 38,
[47] 43, 44, 45, 46, 47, 42,
[53] 49, 50, 51, 52, 53, 48,
...