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문제

연결된, 무향 그래프 G=(V, E)가 주어졌을 때, V가 정점의 집합을 나타내고, E가 간선의 집합을 나타낸다고 하자. V의 부분집합 S를 G에서 제거했을 때, 그래프가 두 개의 연결 요소로 나눠지면 S를 분리자라고 한다. 그래프에서 정점을 제거하면 제거한 정점에 연결된 간선도 함께 제거된다. 이와 같은 상황을 [S, W, B] 라는 기호로 나타내기로 하자. 이는 그래프가 분리자 S에 의해서 W와 B라는 두 개의 연결 요소로 나뉘어 진다는 의미이다.

우리는 격자 모양의 그래프에서의 분리자를 살펴보려 한다. 이 그래프에서 각각의 격자점이 정점을 이루며, 각각의 정점은 이웃한 8개의 정점들과 연결되어 있다. 아래에 6×6 격자 에 대한 예제 그림이 있다. 흰색은 W, 회색은 S, 검은색은 B를 나타낸다.

문제를 단순화하기 위해, 다음의 조건을 만족하는 분리자만 다루기로 하자.

  1. 분리자의 부분집합은 분리자를 이루지 않는다.
  2. 분리자는 그래프에서 맨 윗줄의 한 점과 맨 아랫줄의 한 점을 포함한다. 단, 0, 5, 30, 35는 제외한다.
  3. 분리자를 따라서 그래프를 위에서 아래로 이동할 때, 내려오다가 다시 올라가는 경우는 없다.

이제 다음의 두 단계를 수행하여 분리자의 크기를 줄이려고 한다.

  1. B에서 몇 개의 정점을 택해서 S에 포함시킨다. 이 때 택한 정점들은 반드시 왼쪽 정점으로 S에 포함된 정점을 가지고 있어야 한다.
  2. S에서 몇 개의 정점을 제거하여 W에 포함시킨다. 단, 이전 단계에서 포함시킨 정점들은 제거할 수 없다.

이와 같은 개선 방법을 이용하여 S가 여전히 분리자이도록 하고, 이 때 S의 크기를 최소로 하라. 위의 예제는 다음과 같이 하면 S의 크기가 7로 최소가 된다.

입력

입력은 여러 개의 테스트 케이스로 이루어져 있다.

첫째 줄에 격자의 크기를 나타내는 두 정수 N, M(3≤N,M≤200)이 주어진다. 이는 격자의 크기가 N×M이라는 의미이다. 다음 N개의 줄에는 M개의 문자가 주어지는데, 각각은 S, W, B 중의 하나이다. 이는 해당 정점이 S, W, B 중 어느 집합에 속해있는지를 나타낸다. W는 반드시 S의 왼쪽에 존재한다. 잘못된 입력이 주어지지는 않는다고 가정해도 좋다. 모든 문자는 붙어서 입력된다.

입력의 마지막 줄에는 0이 두 개 주어진다.

출력

첫째 줄에 S의 최소 크기를 출력한다.

예제 입력 1

6 6
WWSBBB
WSSBBB
WSBBBB
WSBBBB
WSSSBB
WWWSBB
0 0

예제 출력 1

7
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V\uc758 \ubd80\ubd84\uc9d1\ud569 S\ub97c G\uc5d0\uc11c \uc81c\uac70\ud588\uc744 \ub54c, \uadf8\ub798\ud504\uac00 \ub450 \uac1c\uc758 \uc5f0\uacb0 \uc694\uc18c\ub85c \ub098\ub220\uc9c0\uba74 S\ub97c \ubd84\ub9ac\uc790\ub77c\uace0 \ud55c\ub2e4. \uadf8\ub798\ud504\uc5d0\uc11c \uc815\uc810\uc744 \uc81c\uac70\ud558\uba74 \uc81c\uac70\ud55c \uc815\uc810\uc5d0 \uc5f0\uacb0\ub41c \uac04\uc120\ub3c4 \ud568\uaed8 \uc81c\uac70\ub41c\ub2e4. \uc774\uc640 \uac19\uc740 \uc0c1\ud669\uc744 [S, W, B] \ub77c\ub294 \uae30\ud638\ub85c \ub098\ud0c0\ub0b4\uae30\ub85c \ud558\uc790. \uc774\ub294 \uadf8\ub798\ud504\uac00 \ubd84\ub9ac\uc790 S\uc5d0 \uc758\ud574\uc11c W\uc640 B\ub77c\ub294 \ub450 \uac1c\uc758 \uc5f0\uacb0 \uc694\uc18c\ub85c \ub098\ub258\uc5b4 \uc9c4\ub2e4\ub294 \uc758\ubbf8\uc774\ub2e4.<\/p>\r\n\r\n<p>\uc6b0\ub9ac\ub294 \uaca9\uc790 \ubaa8\uc591\uc758 \uadf8\ub798\ud504\uc5d0\uc11c\uc758 \ubd84\ub9ac\uc790\ub97c \uc0b4\ud3b4\ubcf4\ub824 \ud55c\ub2e4. \uc774 \uadf8\ub798\ud504\uc5d0\uc11c \uac01\uac01\uc758 \uaca9\uc790\uc810\uc774 \uc815\uc810\uc744 \uc774\ub8e8\uba70, \uac01\uac01\uc758 \uc815\uc810\uc740 \uc774\uc6c3\ud55c 8\uac1c\uc758 \uc815\uc810\ub4e4\uacfc \uc5f0\uacb0\ub418\uc5b4 \uc788\ub2e4. \uc544\ub798\uc5d0 6&times;6 \uaca9\uc790 \uc5d0 \ub300\ud55c \uc608\uc81c \uadf8\ub9bc\uc774 \uc788\ub2e4. \ud770\uc0c9\uc740 W, \ud68c\uc0c9\uc740 S, \uac80\uc740\uc0c9\uc740 B\ub97c \ub098\ud0c0\ub0b8\ub2e4.<\/p>\r\n\r\n<p><img alt=\"\" src=\"\/JudgeOnline\/upload\/201009\/1.PNG\" style=\"height:352px; width:349px\" \/><\/p>\r\n\r\n<p>\ubb38\uc81c\ub97c \ub2e8\uc21c\ud654\ud558\uae30 \uc704\ud574, \ub2e4\uc74c\uc758 \uc870\uac74\uc744 \ub9cc\uc871\ud558\ub294 \ubd84\ub9ac\uc790\ub9cc \ub2e4\ub8e8\uae30\ub85c \ud558\uc790.<\/p>\r\n\r\n<ol>\r\n\t<li>\ubd84\ub9ac\uc790\uc758 \ubd80\ubd84\uc9d1\ud569\uc740 \ubd84\ub9ac\uc790\ub97c \uc774\ub8e8\uc9c0 \uc54a\ub294\ub2e4.<\/li>\r\n\t<li>\ubd84\ub9ac\uc790\ub294 \uadf8\ub798\ud504\uc5d0\uc11c \ub9e8 \uc717\uc904\uc758 \ud55c \uc810\uacfc \ub9e8 \uc544\ub7ab\uc904\uc758 \ud55c \uc810\uc744 \ud3ec\ud568\ud55c\ub2e4. \ub2e8, 0, 5, 30, 35\ub294 \uc81c\uc678\ud55c\ub2e4.<\/li>\r\n\t<li>\ubd84\ub9ac\uc790\ub97c \ub530\ub77c\uc11c \uadf8\ub798\ud504\ub97c \uc704\uc5d0\uc11c \uc544\ub798\ub85c \uc774\ub3d9\ud560 \ub54c, \ub0b4\ub824\uc624\ub2e4\uac00 \ub2e4\uc2dc \uc62c\ub77c\uac00\ub294 \uacbd\uc6b0\ub294 \uc5c6\ub2e4.<\/li>\r\n<\/ol>\r\n\r\n<p>\uc774\uc81c \ub2e4\uc74c\uc758 \ub450 \ub2e8\uacc4\ub97c \uc218\ud589\ud558\uc5ec \ubd84\ub9ac\uc790\uc758 \ud06c\uae30\ub97c \uc904\uc774\ub824\uace0 \ud55c\ub2e4.<\/p>\r\n\r\n<ol>\r\n\t<li>B\uc5d0\uc11c \uba87 \uac1c\uc758 \uc815\uc810\uc744 \ud0dd\ud574\uc11c S\uc5d0 \ud3ec\ud568\uc2dc\ud0a8\ub2e4. \uc774 \ub54c \ud0dd\ud55c \uc815\uc810\ub4e4\uc740 \ubc18\ub4dc\uc2dc \uc67c\ucabd \uc815\uc810\uc73c\ub85c S\uc5d0 \ud3ec\ud568\ub41c \uc815\uc810\uc744 \uac00\uc9c0\uace0 \uc788\uc5b4\uc57c \ud55c\ub2e4.<\/li>\r\n\t<li>S\uc5d0\uc11c \uba87 \uac1c\uc758 \uc815\uc810\uc744 \uc81c\uac70\ud558\uc5ec W\uc5d0 \ud3ec\ud568\uc2dc\ud0a8\ub2e4. \ub2e8, \uc774\uc804 \ub2e8\uacc4\uc5d0\uc11c \ud3ec\ud568\uc2dc\ud0a8 \uc815\uc810\ub4e4\uc740 \uc81c\uac70\ud560 \uc218 \uc5c6\ub2e4.<\/li>\r\n<\/ol>\r\n\r\n<p>\uc774\uc640 \uac19\uc740 \uac1c\uc120 \ubc29\ubc95\uc744 \uc774\uc6a9\ud558\uc5ec S\uac00 \uc5ec\uc804\ud788 \ubd84\ub9ac\uc790\uc774\ub3c4\ub85d \ud558\uace0, \uc774 \ub54c S\uc758 \ud06c\uae30\ub97c \ucd5c\uc18c\ub85c \ud558\ub77c. \uc704\uc758 \uc608\uc81c\ub294 \ub2e4\uc74c\uacfc \uac19\uc774 \ud558\uba74 S\uc758 \ud06c\uae30\uac00 7\ub85c \ucd5c\uc18c\uac00 \ub41c\ub2e4.<\/p>\r\n\r\n<p><img alt=\"\" src=\"\/JudgeOnline\/upload\/201009\/2.PNG\" style=\"height:352px; width:349px\" \/><\/p>\r\n","input":"<p>\uc785\ub825\uc740 \uc5ec\ub7ec \uac1c\uc758 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\ub85c \uc774\ub8e8\uc5b4\uc838 \uc788\ub2e4.<\/p>\r\n\r\n<p>\uccab\uc9f8 \uc904\uc5d0 \uaca9\uc790\uc758 \ud06c\uae30\ub97c \ub098\ud0c0\ub0b4\ub294 \ub450 \uc815\uc218 N, M(3&le;N,M&le;200)\uc774 \uc8fc\uc5b4\uc9c4\ub2e4. \uc774\ub294 \uaca9\uc790\uc758 \ud06c\uae30\uac00 N&times;M\uc774\ub77c\ub294 \uc758\ubbf8\uc774\ub2e4. \ub2e4\uc74c N\uac1c\uc758 \uc904\uc5d0\ub294 M\uac1c\uc758 \ubb38\uc790\uac00 \uc8fc\uc5b4\uc9c0\ub294\ub370, \uac01\uac01\uc740 S, W, B \uc911\uc758 \ud558\ub098\uc774\ub2e4. \uc774\ub294 \ud574\ub2f9 \uc815\uc810\uc774 S, W, B \uc911 \uc5b4\ub290 \uc9d1\ud569\uc5d0 \uc18d\ud574\uc788\ub294\uc9c0\ub97c \ub098\ud0c0\ub0b8\ub2e4. W\ub294 \ubc18\ub4dc\uc2dc S\uc758 \uc67c\ucabd\uc5d0 \uc874\uc7ac\ud55c\ub2e4. \uc798\ubabb\ub41c \uc785\ub825\uc774 \uc8fc\uc5b4\uc9c0\uc9c0\ub294 \uc54a\ub294\ub2e4\uace0 \uac00\uc815\ud574\ub3c4 \uc88b\ub2e4. \ubaa8\ub4e0 \ubb38\uc790\ub294 \ubd99\uc5b4\uc11c \uc785\ub825\ub41c\ub2e4.<\/p>\r\n\r\n<p>\uc785\ub825\uc758 \ub9c8\uc9c0\ub9c9 \uc904\uc5d0\ub294 0\uc774 \ub450 \uac1c \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n","output":"<p>\uccab\uc9f8 \uc904\uc5d0 S\uc758 \ucd5c\uc18c \ud06c\uae30\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"","original":"0","problem_lang_code":"\ud55c\uad6d\uc5b4"},{"problem_id":"2288","problem_lang":"1","title":"The Separator in Grid","description":"<p>Given a connected, undirected graph G = (V, E), where V is the vertex set consisting a collection of nodes, and E is the set of edges, each of which connects two nodes from V. A vertex subset S is a separator if the subgraph induced by the vertices in V, but not in S, has two connected components. We shall use the notation [S, W, B] to represent the partition, where the removal of the separator S will give two connected components W and B.&nbsp;<\/p>\r\n\r\n\r\n\r\n<table class=\"table\" style=\"width:100%\">\r\n\t<tbody>\r\n\t\t<tr>\r\n\t\t\t<td style=\"width:50%\"><img alt=\"\" src=\"\/JudgeOnline\/upload\/201009\/1.PNG\" style=\"height:352px; opacity:0.9; width:349px\" \/><\/td>\r\n\t\t\t<td style=\"width:50%\"><img alt=\"\" src=\"\/JudgeOnline\/upload\/201009\/2.PNG\" style=\"height:352px; opacity:0.9; width:349px\" \/><\/td>\r\n\t\t<\/tr>\r\n\t\t<tr>\r\n\t\t\t<td>Figure-1. Partition (S,W,B)<\/td>\r\n\t\t\t<td>Figure-2. New Partition<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n\r\n<p>In this problem, we consider the separators in grids. Each node in a grid is connected to its eight neighbors (if they exist). In Figure-1, we illustrate a partition of a 6*6 grid with a 9-point separator (gray nodes in the figure). The nodes on the left of the separator are in set W (white nodes), and the nodes on the right of the separator are in set B (black nodes).&nbsp;<\/p>\r\n\r\n<p>To simplify the problem, you can assume that all the separators referred in this problem satisfy the following restrictions:&nbsp;<\/p>\r\n\r\n<ol>\r\n\t<li>It&rsquo;s a minimal separator. A separator is minimal if no subset of it forms a separator.&nbsp;<\/li>\r\n\t<li>It begins from a node on the top line of the grid, except the corner (i.e. 30 and 35 in the figures), and ends with a node on the bottom line of the grid, also except the corner (i.e. 0 and 5 in the figures).<\/li>\r\n\t<li>On its way from top to bottom, it can go left, right or down, but never go up.&nbsp;<\/li>\r\n<\/ol>\r\n\r\n<p>Now we describe a method to improve a given partition on a grid, through which we can reduce the number of nodes in the separator. This method contains two steps:&nbsp;<\/p>\r\n\r\n<ol>\r\n\t<li>Select several nodes from B and add them into S. Any of the selected nodes must have a left neighbor which is in S.&nbsp;<\/li>\r\n\t<li>Remove several nodes from S (excluding the nodes added in the former step), and add them into W.&nbsp;<\/li>\r\n<\/ol>\r\n\r\n<p>After the improvement, we should ensure S is still a separator, and make the number of nodes in S as small as possible. As for Figure-1, we should add 14 and 20 into S, and remove 7, 13, 19 and 25 from S. After that, we obtain a new partition with a 7-point separator shown in Figure-2.&nbsp;<\/p>\r\n\r\n<p>Your task is, given a partition on a grid, to determine the least number of nodes in the separator after the improvement.&nbsp;<\/p>\r\n","input":"<p>There are several test cases. Each case begins with a line containing two integers, N and M (3 &le; M, N &le;&nbsp;200). In each of the following N lines, there are M characters, describing the initial partition of the M*N grid. Every character is &#39;S&#39;, &#39;W&#39; or &#39;B&#39;. It is confirmed that each of these three characters appears at least once in each line, and &#39;W&#39;s are always on the left of &#39;S&#39;s.&nbsp;<\/p>\r\n\r\n<p>A test case of N = 0 and M = 0 indicates the end of input, and should not be processed.&nbsp;<\/p>\r\n","output":"<p>For each test case, you should output one line containing one integer, which is the least number of nodes in the separator after the improvement.<\/p>\r\n\r\n<p>&nbsp;<\/p>\r\n","hint":"","original":"1","problem_lang_code":"\uc601\uc5b4"}]