Intuitive approach for CEOI Kangaroo?
Difference between en1 and en2, changed 10 character(s)
The second task from day 1 of CEOI 2016 is a task whichith a solution that confuses me, not because it is hard to understand, but because of the fact that I cannot understand how someone could come up with it. When I read the official solution, it just looks like they shuffled some formulas around until they got an expression with an invariant with no real motivation for the process. Is there any, more intuitive approach for solving this problem? Thanks in advance.

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en2 English dino_merlin 2023-10-07 00:08:15 10 Tiny change: 's a task which solution confuses ' -> 's a task with a solution that confuses '
en1 English dino_merlin 2023-10-07 00:07:18 496 Initial revision (published)