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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

hide comments
stranger480: 2020-04-17 08:01:30

be careful while printing output "Case : " .A single space character costed me two WAs :(
its a simple dfs problem .

mrmajumder: 2020-03-27 05:31:39

Both BFS and DFS works!

jopdhiwaala: 2020-03-21 06:30:47

Dude i am so mad right now :( i thought that you dont have to traverse back and upwards -_-

killer_knight: 2019-10-18 11:46:05

be careful of garbage values if you are using 1 based indexing..costed me 3 wa :(

remembermeonce: 2019-09-28 00:02:33

@andyy143: your code output give so much blank space firstly you have to check your code on some input on some offline ide then you saw it show so much blank space. Remove these bugs then your code definitely accepted.

ishancosmos25: 2019-09-24 15:52:35

Good DFS!!

ishancosmos25: 2019-09-24 15:27:58

No image. LOL :-), if there is any admin, please solve this issue, how could we practice????

shim1998: 2019-09-17 23:12:53

there's no image
almost impossible to look at the question now lol

nikhil_sarda: 2019-09-02 08:41:58

Don't forget that the sequence must start from 'A'.
Simply use recursion+memoization.

md_meraj1319: 2019-08-26 20:22:51

my code gives runtime error anyone suggests me why they give run time error.

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