ABCPATH - ABC Path

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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':

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

hide comments
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 :/

DFS

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

Shubham: 2015-06-11 20:19:00

Easy one...silly mistake costed me WA...just use DFS nd optimize it !!!!!

Shubham Bansal: 2015-05-26 21:41:24

be careful about output format..

maala_m: 2015-05-22 18:01:55

i had 2 TLE too ... i will use visited path arrray
@god_father


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