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71 - ZOJ Monthly, October 2008 - ConSame
Continuous Same Game

Time Limit: 1 Second      Memory Limit: 32768 KB

Problem Description

Continuous Same Game is a simple game played on a grid of colored blocks. Groups of two or more connected (orthogonally, not diagonally) blocks that are the same color may be removed from the board. When a group of blocks is removed, the blocks above those removed ones fall down into the empty space. When an entire column of blocks is removed, all the columns to the right of that column shift to the left to fill the empty columns. Points are scored whenever a group of blocks is removed. The number of points per block increases as the group becomes bigger. When N blocks are removed, N*(N-1) points are scored.

LL was interested in this game at one time, but he found it is so difficult to find the optimal scheme. So he always play the game with a greedy strategy: choose the largest group to remove and if there are more than one largest group with equal number of blocks, choose the one which contains the most preceding block ( (x1,y1) is in front of (x2,y2) if and only if (x1<x2 || x1==x2 && y1<y2), where x stands for the rows from top to bottom and y stands for the columns from left to right). Now, he want to know how many points he will get. Can you help him?

Input

Each test case begins with two integers n,m ( 5<= n, m <=20 ), which is the size of the board. Then n lines follow, each contains m digits ranging from 1 to 5, indicating the color of the block.

Output

For each test case, output a single line containing the total point he will get with the greedy strategy, use '0' to represent empty blocks.

Sample Input

5 5
35552
31154
33222
21134
12314
Sample Output

32
Hint

35552    00552    00002    00002    00000    00000
31154    05154    05104    00004    00002    00000
33222 -> 01222 -> 01222 -> 00122 -> 00104 -> 00100
21134    21134    21134    25234    25234    25230
12314    12314    12314    12314    12314    12312

The total point is 12+6+6+2+6=32.

Author: LAI, Li
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