시간 제한메모리 제한제출정답맞힌 사람정답 비율
2 초 512 MB56171746122343.048%

문제

최백준은 서강대학교에서 “컨닝의 기술”이라는 과목을 가르치고 있다. 이 과목은 상당히 까다롭기로 정평이 나있기 때문에, 몇몇 학생들은 시험을 보는 도중에 다른 사람의 답지를 베끼려 한다.

시험은 N행, M열 크기의 직사각형 교실에서 이루어진다. 교실은 1×1 크기의 단위 정사각형으로 이루어져 있는데, 각 단위 정사각형은 자리 하나를 의미한다.

최백준은 컨닝을 방지하기 위해서 다음과 같은 전략을 세웠다. 모든 학생은 자신의 왼쪽, 오른쪽, 왼쪽 대각선 위, 오른쪽 대각선 위, 이렇게 총 네 자리에 앉아있는 친구의 답지를 항상 베낀다고 가정한다. 따라서, 자리 배치는 모든 학생이 컨닝을 할 수 없도록 배치되어야 한다.

위의 그림을 보자. A, C, D 혹은 E에 다른 학생을 앉히는 것은 좋은 생각이 아니다. 그 이유는 이미 앉아있는 학생이 그들의 답안지를 베낄 우려가 있기 때문이다. 하지만, B에 다른 학생을 앉힌다면, 두 학생은 서로의 답지를 베낄 수 없어 컨닝의 우려가 없다.

위와 같이 컨닝이 불가능하도록 자리를 배치 하려는 최백준의 행동에 분노한 일부 학생들이 교실의 책상을 부숴버렸기 때문에, 일부 자리에는 학생이 앉을 수 없다.

최백준은 교실의 모양이 주어졌을 때, 이 곳에서 아무도 컨닝을 할 수 없도록 학생을 배치하였을 경우에 교실에 배치할 수 있는 최대 학생 수가 몇 명인지 궁금해졌다. 최백준을 위해 이를 구하는 프로그램을 작성하라.

입력

입력의 첫 줄에는 테스트케이스의 개수 C가 주어진다. 각각의 테스트 케이스는 아래와 같이 두 부분으로 이루어진다.

첫 번째 부분에서는 교실의 세로길이 N과 가로길이 M이 한 줄에 주어진다. (1 ≤ M ≤ 10, 1 ≤ N ≤ 10)

두 번째 부분에서는 정확하게 N줄이 주어진다. 그리고 각 줄은 M개의 문자로 이루어져있다. 모든 문자는 ‘.’(앉을 수 있는 자리) 또는 ‘x’(앉을 수 없는 자리, 소문자)로 구성된다.

출력

각각의 테스트 케이스에 대해 그 교실에서 시험을 볼 수 있는 최대 학생의 수를 출력한다.

예제 입력 1

4
2 3
...
...
2 3
x.x
xxx
2 3
x.x
x.x
10 10
....x.....
..........
..........
..x.......
..........
x...x.x...
.........x
...x......
........x.
.x...x....

예제 출력 1

4
1
2
46
[{"problem_id":"1014","problem_lang":"0","title":"\ucee8\ub2dd","description":"<p>\ucd5c\ubc31\uc900\uc740 \uc11c\uac15\ub300\ud559\uad50\uc5d0\uc11c &ldquo;\ucee8\ub2dd\uc758 \uae30\uc220&rdquo;\uc774\ub77c\ub294 \uacfc\ubaa9\uc744 \uac00\ub974\uce58\uace0 \uc788\ub2e4. \uc774 \uacfc\ubaa9\uc740 \uc0c1\ub2f9\ud788 \uae4c\ub2e4\ub86d\uae30\ub85c \uc815\ud3c9\uc774 \ub098\uc788\uae30 \ub54c\ubb38\uc5d0, \uba87\uba87 \ud559\uc0dd\ub4e4\uc740 \uc2dc\ud5d8\uc744 \ubcf4\ub294 \ub3c4\uc911\uc5d0 \ub2e4\ub978 \uc0ac\ub78c\uc758 \ub2f5\uc9c0\ub97c \ubca0\ub07c\ub824 \ud55c\ub2e4.<\/p>\r\n\r\n<p>\uc2dc\ud5d8\uc740 N\ud589,&nbsp;M\uc5f4 \ud06c\uae30\uc758 \uc9c1\uc0ac\uac01\ud615 \uad50\uc2e4\uc5d0\uc11c \uc774\ub8e8\uc5b4\uc9c4\ub2e4. \uad50\uc2e4\uc740 1&times;1 \ud06c\uae30\uc758 \ub2e8\uc704 \uc815\uc0ac\uac01\ud615\uc73c\ub85c \uc774\ub8e8\uc5b4\uc838 \uc788\ub294\ub370, \uac01 \ub2e8\uc704 \uc815\uc0ac\uac01\ud615\uc740 \uc790\ub9ac \ud558\ub098\ub97c \uc758\ubbf8\ud55c\ub2e4.<\/p>\r\n\r\n<p>\ucd5c\ubc31\uc900\uc740 \ucee8\ub2dd\uc744 \ubc29\uc9c0\ud558\uae30 \uc704\ud574\uc11c \ub2e4\uc74c\uacfc \uac19\uc740 \uc804\ub7b5\uc744 \uc138\uc6e0\ub2e4. \ubaa8\ub4e0 \ud559\uc0dd\uc740 \uc790\uc2e0\uc758 \uc67c\ucabd, \uc624\ub978\ucabd, \uc67c\ucabd \ub300\uac01\uc120 \uc704, \uc624\ub978\ucabd \ub300\uac01\uc120 \uc704, \uc774\ub807\uac8c \ucd1d \ub124 \uc790\ub9ac\uc5d0 \uc549\uc544\uc788\ub294 \uce5c\uad6c\uc758 \ub2f5\uc9c0\ub97c \ud56d\uc0c1 \ubca0\ub080\ub2e4\uace0 \uac00\uc815\ud55c\ub2e4. \ub530\ub77c\uc11c, \uc790\ub9ac \ubc30\uce58\ub294 \ubaa8\ub4e0 \ud559\uc0dd\uc774 \ucee8\ub2dd\uc744 \ud560 \uc218 \uc5c6\ub3c4\ub85d \ubc30\uce58\ub418\uc5b4\uc57c \ud55c\ub2e4.<\/p>\r\n\r\n<p style=\"text-align:center\"><img alt=\"\" src=\"\/upload\/201003\/cunning.JPG\" style=\"height:124px; width:183px\" \/><\/p>\r\n\r\n<p>\uc704\uc758 \uadf8\ub9bc\uc744 \ubcf4\uc790. A, C, D \ud639\uc740 E\uc5d0 \ub2e4\ub978 \ud559\uc0dd\uc744 \uc549\ud788\ub294 \uac83\uc740 \uc88b\uc740 \uc0dd\uac01\uc774 \uc544\ub2c8\ub2e4. \uadf8 \uc774\uc720\ub294 \uc774\ubbf8 \uc549\uc544\uc788\ub294 \ud559\uc0dd\uc774 \uadf8\ub4e4\uc758 \ub2f5\uc548\uc9c0\ub97c \ubca0\ub084 \uc6b0\ub824\uac00 \uc788\uae30 \ub54c\ubb38\uc774\ub2e4. \ud558\uc9c0\ub9cc, B\uc5d0 \ub2e4\ub978 \ud559\uc0dd\uc744 \uc549\ud78c\ub2e4\uba74, \ub450 \ud559\uc0dd\uc740 \uc11c\ub85c\uc758 \ub2f5\uc9c0\ub97c \ubca0\ub084 \uc218 \uc5c6\uc5b4 \ucee8\ub2dd\uc758 \uc6b0\ub824\uac00 \uc5c6\ub2e4.<\/p>\r\n\r\n<p>\uc704\uc640 \uac19\uc774 \ucee8\ub2dd\uc774 \ubd88\uac00\ub2a5\ud558\ub3c4\ub85d \uc790\ub9ac\ub97c \ubc30\uce58 \ud558\ub824\ub294 \ucd5c\ubc31\uc900\uc758 \ud589\ub3d9\uc5d0 \ubd84\ub178\ud55c \uc77c\ubd80 \ud559\uc0dd\ub4e4\uc774 \uad50\uc2e4\uc758 \ucc45\uc0c1\uc744 \ubd80\uc234\ubc84\ub838\uae30 \ub54c\ubb38\uc5d0, \uc77c\ubd80 \uc790\ub9ac\uc5d0\ub294 \ud559\uc0dd\uc774 \uc549\uc744 \uc218 \uc5c6\ub2e4.<\/p>\r\n\r\n<p>\ucd5c\ubc31\uc900\uc740 \uad50\uc2e4\uc758 \ubaa8\uc591\uc774 \uc8fc\uc5b4\uc84c\uc744 \ub54c, \uc774 \uacf3\uc5d0\uc11c \uc544\ubb34\ub3c4 \ucee8\ub2dd\uc744 \ud560 \uc218 \uc5c6\ub3c4\ub85d \ud559\uc0dd\uc744 \ubc30\uce58\ud558\uc600\uc744 \uacbd\uc6b0\uc5d0 \uad50\uc2e4\uc5d0 \ubc30\uce58\ud560 \uc218 \uc788\ub294 \ucd5c\ub300 \ud559\uc0dd \uc218\uac00 \uba87 \uba85\uc778\uc9c0 \uad81\uae08\ud574\uc84c\ub2e4. \ucd5c\ubc31\uc900\uc744 \uc704\ud574 \uc774\ub97c \uad6c\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\ub77c.<\/p>\r\n","input":"<p>\uc785\ub825\uc758 \uccab \uc904\uc5d0\ub294 \ud14c\uc2a4\ud2b8\ucf00\uc774\uc2a4\uc758 \uac1c\uc218 C\uac00 \uc8fc\uc5b4\uc9c4\ub2e4. \uac01\uac01\uc758 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\ub294 \uc544\ub798\uc640 \uac19\uc774&nbsp;\ub450 \ubd80\ubd84\uc73c\ub85c \uc774\ub8e8\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\uccab \ubc88\uc9f8 \ubd80\ubd84\uc5d0\uc11c\ub294 \uad50\uc2e4\uc758 \uc138\ub85c\uae38\uc774 N\uacfc \uac00\ub85c\uae38\uc774 M\uc774 \ud55c \uc904\uc5d0 \uc8fc\uc5b4\uc9c4\ub2e4.&nbsp;(1&nbsp;&le; M &le; 10, 1 &le; N &le; 10)<\/p>\r\n\r\n<p>\ub450 \ubc88\uc9f8 \ubd80\ubd84\uc5d0\uc11c\ub294 \uc815\ud655\ud558\uac8c N\uc904\uc774 \uc8fc\uc5b4\uc9c4\ub2e4. \uadf8\ub9ac\uace0 \uac01 \uc904\uc740 M\uac1c\uc758 \ubb38\uc790\ub85c \uc774\ub8e8\uc5b4\uc838\uc788\ub2e4. \ubaa8\ub4e0 \ubb38\uc790\ub294 <strong>&lsquo;.&rsquo;<\/strong>(\uc549\uc744 \uc218 \uc788\ub294 \uc790\ub9ac) \ub610\ub294 <strong>&lsquo;x&rsquo;<\/strong>(\uc549\uc744 \uc218 \uc5c6\ub294 \uc790\ub9ac, \uc18c\ubb38\uc790)\ub85c \uad6c\uc131\ub41c\ub2e4.<\/p>\r\n","output":"<p>\uac01\uac01\uc758 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\uc5d0 \ub300\ud574 \uadf8 \uad50\uc2e4\uc5d0\uc11c \uc2dc\ud5d8\uc744 \ubcfc \uc218 \uc788\ub294 \ucd5c\ub300 \ud559\uc0dd\uc758 \uc218\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"Korean"},{"problem_id":"1014","problem_lang":"1","title":"No Cheating (Small)","description":"<p>A local high school is going to hold a final exam in a big classroom. However, some students in this school are always trying to see each other&#39;s answer sheet during exams!<\/p>\r\n\r\n<p>The classroom can be regarded as a rectangle of&nbsp;<strong>M<\/strong>&nbsp;rows by&nbsp;<strong>N<\/strong>&nbsp;columns of unit squares, where each unit square represents a seat.<\/p>\r\n\r\n<p>The school principal decided to set the following rule to prevent cheating:<br \/>\r\nAssume a student is able to see his left, right, upper-left, and upper-right neighbors&#39; answer sheets. The assignment of seats must guarantee that nobody&#39;s answer sheet can be seen by any other student.&nbsp;<\/p>\r\n\r\n<p style=\"text-align: center;\"><img alt=\"\" src=\"https:\/\/onlinejudgeimages.s3.amazonaws.com\/problem\/12699\/cunning.jpg\" \/><\/p>\r\n\r\n<p>As in this picture, it will not be a good idea to seat anyone in A, C, D, or E because the boy in the back row would be able to see their answer sheets. However, if there is a girl sitting in B, he will not be able to see her answer sheet.<\/p>\r\n\r\n<p>Some seats in the classroom are broken, and we cannot put a student in a broken seat.<\/p>\r\n\r\n<p>The principal asked you to answer the following question: What is the maximum number of students that can be placed in the classroom so that no one can cheat?<\/p>\r\n","input":"<p>The first line of input gives the number of cases,&nbsp;<strong>C<\/strong>.&nbsp;<strong>C<\/strong>&nbsp;test cases follow. Each case consists of two parts.<\/p>\r\n\r\n<p>The first part is a single line with two integers&nbsp;<strong>M<\/strong>&nbsp;and&nbsp;<strong>N<\/strong>: The height and width of the rectangular classroom.<\/p>\r\n\r\n<p>The second part will be exactly&nbsp;<strong>M<\/strong>&nbsp;lines, with exactly&nbsp;<strong>N<\/strong>&nbsp;characters in each of these lines. Each character is either a &#39;.&#39; (the seat is not broken) or &#39;x&#39; (the seat is broken, lowercase x).<\/p>\r\n\r\n<p>Limits<\/p>\r\n\r\n<ul>\r\n\t<li><strong>C<\/strong>&nbsp;= 20<\/li>\r\n\t<li>1 &le;&nbsp;<strong>M<\/strong>&nbsp;&le; 10<\/li>\r\n\t<li>1 &le;&nbsp;<strong>N<\/strong>&nbsp;&le; 10<\/li>\r\n<\/ul>\r\n","output":"<p>For each test case, output one line containing &quot;<strong>Y<\/strong>&quot;, where&nbsp;<strong>Y<\/strong>&nbsp;is the maximum possible number of students that can take the exam in the classroom.<\/p>\r\n","hint":"","original":"1","html_title":"0","problem_lang_tcode":"English"}]

출처

Contest > Google > Code Jam > Google Code Jam 2008 > Round 3 C1번

비슷한 문제