ABCPATH - ABC Path

You will be given a 2-dimensional grid of letters. Find the length of the longest path of consecutive letters, starting at 'A'. Paths can step from one letter in the grid to any adjacent letter (horizontally, vertically, or diagonally).

For example, in the following grid, there are several paths from 'A' to 'D', but none from 'A' to 'E':

ABC

One such path is:

path

Input

Each test case will start with a line contains two integers H, W the height and width of the grid respectively 1 <= H, W <= 50. Then H lines follow each of W uppercase letters only. Input terminates with H = 0 and W = 0.

Output

For each test case print “Case C: X” without quotes where C is the case number starting with 1 and X is the solution.

Example

Sample Input:
4 3
ABE
CFG
BDH
ABC
0 0

Sample Output:
Case 1: 4

Added by:Ali Arous
Date:2011-11-05
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ASM64
Resource:FCIS Local Contest 2012

hide comments
2016-05-31 21:41:28 Vishal
Starting with 'A' cost me three wrong answers

Last edit: 2016-05-31 21:41:44
2016-05-31 15:25:06
Used BFS => 4 TLE (memeory 701MB)
Used DFS => AC (memory 3.3MB Time 0.00)
preferably Use DFS
2016-04-30 16:47:47 poojan
Dfs+memo
2016-03-26 19:15:20
Dp 0.00 :)
2016-03-21 09:50:43
Basic recursion...
2016-03-08 07:19:18 Ankit Kumar
i am getting can anybody help.
2016-03-01 15:18:18 enigmus
Don't bother solving it in Python. Time limit is strict, although interestingly I see some Python solutions got AC

Last edit: 2016-03-01 15:22:44
2016-03-01 12:09:07
OP Formar -> Case 1: 4
2016-02-14 18:46:46 Wumbolo
easy bfs > 0.00. 50th on spoj :)
2016-02-03 19:41:44
plain memoization: 0.00 :)
© Spoj.com. All Rights Reserved. Spoj uses Sphere Engine™ © by Sphere Research Labs.