ABCPATH  ABC Path
You will be given a 2dimensional 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:
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
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rohit9934:
20170507 09:08:23
See Number of islands problem GeeksforGeeks Before this(If you are new in 2D Matrix Graph Traversals Like me :p 

Nafis Islam:
20170411 23:47:03
ios_base::sync_with_stdio(false) costed me a lot of wa. Dont know why sync_with_stdio creates string input problem Last edit: 20170411 23:47:45 

anurag_tangri:
20170316 18:41:15
AC after 10 WA's :(


nilabja16180:
20170308 11:02:27
dfs with memo works otherwise TLE!


scorpion_ajay:
20170307 08:24:06
basics for DFS, AC in second go ;) 

da_201501181:
20170303 21:13:18
AC in one GO.!! Simple BFS


gauravgb21:
20170227 19:20:09
AC in first go


shiv pratap singh:
20170225 08:06:17
use multipointbfs


coder_hsnake:
20170203 23:46:53
solved in one go using dp :D 

imperfectboy:
20170129 18:38:33
AC in one GO!!! 
Added by:  Ali Arous 
Date:  20111105 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ASM64 
Resource:  FCIS Local Contest 2012 