CSLIKAR - Slikar

no tags 

The evil emperor Cactus has in his possession the Magic Keg and has flooded the Enchanted
Forest! The Painter and the three little hedgehogs now have to return to the Beaver's den where they  
will be safe from the water as quickly as possible!  
The map of the Enchanted Forest consists of R rows and C columns. Empty fields are represented
by '.' characters, flooded fields by '*' and rocks by 'X'. Additionally, the Beaver's den is represented
by 'D' and the Painter and the three little hedgehogs are shown as 'S'.  
Every minute the Painter and the three little hedgehogs can move to 4 neighbouring fields (up,  
down, left or right). Every minute the flood expands as well so that all empty fields that have at least  
one common side with a flooded field become flooded as well. Neither water nor the Painter and
the three little hedgehogs can pass through rocks. Naturally, the Painter and the three little  
hedgehogs cannot pass through flooded fields, and water cannot flood the Beaver's den.
Write a program that will, given a map of the Enchanted Forest, output the shortest time needed  
for the Painter and the three little hedgehogs to safely reach the Beaver's den.
Note:  The Painter and the three little hedgehogs cannot move into a field that is about to be  
flooded (in the same minute).

Input

The first line of input will contain two integers, R and C, smaller than or equal to 50.  
The following R lines will each contain C characters ('.', '*', 'X', 'D' or 'S'). The map will contain  
exactly one 'D' character and exactly one 'S' character

Output

Output the  shortest possible time needed for the Painter and the three little hedgehogs to safely  
reach the Beaver's den. If this is impossible output the word “KAKTUS” on a line by itself.

Example

Input:
3 6
D...*.
.X.X..
....S.

Output:
6

hide comments
dark_lord1: 2015-11-09 00:10:58

Algorithm was easy to think but coding the algorithm took time..Easy Algorithm

(Tjandra Satria Gunawan)(曾毅昆): 2013-01-07 01:34:48

@Buda IM: Sorry, but I think that's not hint because it's too general ;-)

Buda IM (retired): 2013-01-07 00:51:24

please yet again, read the notes below, no hints in comment section, we have forums for that

(Tjandra Satria Gunawan)(曾毅昆): 2013-01-05 17:09:45

HIDDEN BECAUSE OF HINT

Last edit: 2013-03-05 02:28:38
Archit Mittal: 2013-01-01 04:32:14

nice problem...


Added by:Erik Lončarek
Date:2012-12-27
Time limit:0.100s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All
Resource:COCI