they says "segment from ai to bi" , what it mean?
If i right , that mean that bi do not to be a repainting, then when we repaint in white color, we have line [ai] - [bi-1] right??

but in example :
40 300 w
300 634!!!!! w
43 47!!!! b
they says the answer: 47 634

why??
i think in first step we have a line 40 - 299 , then 40 - 633!!! and then 47 - 633 ... explain me where i wrong??

p.s sorry for bad english...

Edited by author 03.04.2010 18:48

Представьте координатную ось и попытайтесь покрасить её кусочек от какого-то x1 до x2. Тут аналогично.