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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':


One such path is:



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.


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


Sample Input:
4 3
0 0

Sample Output:
Case 1: 4

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sathya_dev: 2015-11-23 14:53:47

For those getting WA. A Path has to start from 'A' and sequence of consecutive letters (not just any sequence of consecutive letters.
BCD & AB the op = 2 not 3.

varun yadav: 2015-11-05 09:48:00

finally accepted :p

Himanshu Bansal: 2015-10-31 14:53:00

nice question

dev: 2015-10-19 13:26:48

FIRST dfs prob !! Ac :)

topke: 2015-10-08 10:29:54

This is easy i don't know why it has 20% success rate :D

Shashank Tiwari: 2015-09-29 04:39:08

Well , instead of saying DFS , i will say recursion with memoization

shayan718: 2015-09-15 11:37:25

mr salimi what r u doing ?

Harsh Vardhan Ladha: 2015-09-08 19:49:44

Consider the case when matrix do not have character A
Caused me 3 WA :/


Similar Problem : ALLIZWELL

Steven Hans Limantoro: 2015-07-16 18:35:27

Multisource BFS is your friend (y)

Last edit: 2015-07-16 18:40:19
SangKuan: 2015-07-07 12:00:14

One TLE, One WA.first use bfs...then output error.haha

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