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문제

해빈이와 준규는 쿠키를 좋아하는 쌍둥이 형제이다. 두 사람의 친구 진욱이는 해빈이와 준규에게 쿠키를 만들어주는 것을 세상에서 가장 좋아한다. 하지만, 진욱이는 두 사람이 쿠키를 너무 빨리 먹는다면서 불평한다. 오늘은 두 사람에게 쿠키를 천천히 먹는 방법을 게임을 통해 가르치려고 한다.

진욱이가 구운 쿠키의 수는 N개이고, 각각 1번부터 N번까지 번호가 매겨져 있다. 쿠키는 원형으로 배치되어 있고, i번 쿠키는 i-1번과 i+1번 쿠키 사이에 있다. 1번과 N번 쿠키는 서로 이웃이다.

쿠키는 총 26가지 맛이 있다. 진욱이는 각 맛을 알파벳 소문자 'a'부터 'z'까지로 나타낸다. 같은 알파벳을 가지는 맛은 동일하다.

해빈이와 준규는 쿠기를 5분에 하나씩 먹을 수 있다. 진욱이는 숫자 하나를 크게 외치면, 두 사람은 그 쿠키와 이웃한 쿠키를 먹게 된다. 이 게임은 남은 쿠키의 개수가 1개 또는 2개일때까지 계속되며, 게임이 끝난 후 남은 쿠키는 진욱이가 먹는다.

게임은 길이가 (N-1) div 2인 수열로 나타낼 수 있다. 수열의 원소는 진욱이가 외친 숫자이다. 예를 들어, 위의 그림에서 수열은 (4, 8, 6)이 된다. 수열을 이루고 있는 숫자가 다른 경우에 두 게임은 다르다고 한다.

게임을 몇 번 진행한 후에 진욱이는 해빈이와 준규가 게임 도중에 싸운다는 사실을 알아냈다. 이웃한 쿠키가 서로 다른 맛을 가진 경우에는 두 사람이 싸우게 된다.

진욱이는 두 사람을 싸우지 않게 하면서 게임을 진행하려고 한다.

쿠키 N개의 맛이 주어졌을 때, 두 사람을 싸우지 않게 하면서 게임을 진행하는 방법의 수를 구하는 프로그램을 작성하시오. 방법의 수가 매우 클 수 있기 때문에, 10,007로 나눈 나머지를 출력한다.

입력

첫째 줄에 쿠키의 수 N(3 ≤ N ≤ 100)이 주어진다. 둘째 줄에는 쿠키의 맛이 순서대로 주어진다.

출력

해빈이와 준규가 싸우지 않게 하면서 게임을 진행하는 방법의 수를 10007로 나눈 나머지를 출력한다.

예제 입력 1

8
cibaboca

예제 출력 1

4

가능한 수열은 (4,8,2), (4,8,6), (8,4,2), (8,4,6)이 있다.

예제 입력 2

5
aabab

예제 출력 2

5

가능한 수열은 (3, 1), (5, 2), (4, 4), (4, 1), (4, 2)가 있다.

예제 입력 3

11
fffffffffff

예제 출력 3

388
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height: 211px;\" \/><\/p>\r\n\r\n<p>\uac8c\uc784\uc740 \uae38\uc774\uac00 (N-1) div 2\uc778 \uc218\uc5f4\ub85c \ub098\ud0c0\ub0bc \uc218 \uc788\ub2e4. \uc218\uc5f4\uc758 \uc6d0\uc18c\ub294 \uc9c4\uc6b1\uc774\uac00 \uc678\uce5c \uc22b\uc790\uc774\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \uc704\uc758 \uadf8\ub9bc\uc5d0\uc11c \uc218\uc5f4\uc740 (4, 8, 6)\uc774 \ub41c\ub2e4. \uc218\uc5f4\uc744 \uc774\ub8e8\uace0 \uc788\ub294 \uc22b\uc790\uac00 \ub2e4\ub978 \uacbd\uc6b0\uc5d0 \ub450 \uac8c\uc784\uc740 \ub2e4\ub974\ub2e4\uace0 \ud55c\ub2e4.<\/p>\r\n\r\n<p>\uac8c\uc784\uc744 \uba87 \ubc88 \uc9c4\ud589\ud55c \ud6c4\uc5d0 \uc9c4\uc6b1\uc774\ub294 \ud574\ube48\uc774\uc640 \uc900\uaddc\uac00 \uac8c\uc784 \ub3c4\uc911\uc5d0 \uc2f8\uc6b4\ub2e4\ub294 \uc0ac\uc2e4\uc744 \uc54c\uc544\ub0c8\ub2e4. \uc774\uc6c3\ud55c \ucfe0\ud0a4\uac00 \uc11c\ub85c \ub2e4\ub978 \ub9db\uc744 \uac00\uc9c4 \uacbd\uc6b0\uc5d0\ub294 \ub450 \uc0ac\ub78c\uc774 \uc2f8\uc6b0\uac8c \ub41c\ub2e4.<\/p>\r\n\r\n<p>\uc9c4\uc6b1\uc774\ub294 \ub450 \uc0ac\ub78c\uc744&nbsp;\uc2f8\uc6b0\uc9c0 \uc54a\uac8c \ud558\uba74\uc11c \uac8c\uc784\uc744 \uc9c4\ud589\ud558\ub824\uace0 \ud55c\ub2e4.<\/p>\r\n\r\n<p>\ucfe0\ud0a4 N\uac1c\uc758 \ub9db\uc774 \uc8fc\uc5b4\uc84c\uc744 \ub54c, \ub450 \uc0ac\ub78c\uc744 \uc2f8\uc6b0\uc9c0 \uc54a\uac8c \ud558\uba74\uc11c \uac8c\uc784\uc744 \uc9c4\ud589\ud558\ub294 \ubc29\ubc95\uc758 \uc218\ub97c \uad6c\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\uc2dc\uc624. \ubc29\ubc95\uc758 \uc218\uac00 \ub9e4\uc6b0 \ud074 \uc218 \uc788\uae30 \ub54c\ubb38\uc5d0, 10,007\ub85c \ub098\ub208 \ub098\uba38\uc9c0\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","input":"<p>\uccab\uc9f8 \uc904\uc5d0 \ucfe0\ud0a4\uc758 \uc218 N(3 &le; N &le; 100)\uc774 \uc8fc\uc5b4\uc9c4\ub2e4. \ub458\uc9f8 \uc904\uc5d0\ub294 \ucfe0\ud0a4\uc758 \ub9db\uc774 \uc21c\uc11c\ub300\ub85c \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n","output":"<p>\ud574\ube48\uc774\uc640 \uc900\uaddc\uac00 \uc2f8\uc6b0\uc9c0 \uc54a\uac8c \ud558\uba74\uc11c \uac8c\uc784\uc744 \uc9c4\ud589\ud558\ub294 \ubc29\ubc95\uc758 \uc218\ub97c 10007\ub85c \ub098\ub208 \ub098\uba38\uc9c0\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"Korean","sample_explain_1":"<p>\uac00\ub2a5\ud55c \uc218\uc5f4\uc740 (4,8,2), (4,8,6), (8,4,2), (8,4,6)\uc774 \uc788\ub2e4.<\/p>\r\n","sample_explain_2":"<p>\uac00\ub2a5\ud55c \uc218\uc5f4\uc740 (3, 1), (5, 2), (4, 4), (4, 1),&nbsp;(4, 2)\uac00 \uc788\ub2e4.<\/p>\r\n"},{"problem_id":"3104","problem_lang":"1","title":"KOLACI","description":"<p>Darko and Marko are twins and they love to eat cookies. Their grandma Mara loves to bake cookies, but she doesn&#39;t like the fact that Darko and Marko eat them too fast.&nbsp;<\/p>\r\n\r\n<p>To teach her grandsons to eat slower, Mara turned it into a game. Mara will bake N cookies and assign them with integers 1 to N. Then she will arrange them in a circle such that each cookie i is between to cookie i&minus;1 and i+1 except for cookies 1 and N that are neighbors.&nbsp;<\/p>\r\n\r\n<p>Mara knows a recipe for 26 different types of cookies. We will denote a cookie type with lower case english letters &#39;a&#39; to &#39;z&#39;.&nbsp;<\/p>\r\n\r\n<p>Darko and Marko will each get one cookie every 5 minutes. Mara will say one integer out loud. Darko and Marko will search for a cookie with this number, but will eat two neighboring cookies. This procedure is repeated until one or two cookies are left on the table. Then the game ends and Mara eats the remaining cookies.&nbsp;<\/p>\r\n\r\n<p><img alt=\"\" src=\"\/upload\/images\/cookie.png\" style=\"height:214px; width:665px\" \/><\/p>\r\n\r\n<p>The game can be represented with a sequence of (N&minus;1) div 2 integers that Mara said out loud. For example, the illustrations above can be represented with a sequence (4, 8, 6). Two games are considered different if their respective sequences are different.&nbsp;<\/p>\r\n\r\n<p>After a few games Mara noticed that Marko and Darko often fight during the game. In fact, they fight every time when the two neighboring cookies are of different types because they can&#39;t decide which one will get which cookie.&nbsp;<\/p>\r\n\r\n<p>Mara decided to count the number of ways to play a game in a way to avoid such situations.&nbsp;<\/p>\r\n\r\n<p>Given a cookie type for each of N cookies, write a program that will calculate the number of ways to play a game such that Darko and Marko will not fight. This number can get very large, so output the remainder of division by 10 007 instead.&nbsp;<\/p>\r\n","input":"<p>The first line contains one integer N (3 &le; N &le; 100), the number of cookies.&nbsp;<\/p>\r\n\r\n<p>The second line contains a sequence of N lower case english letters, types of cookies in order they are arranged in a circle.&nbsp;<\/p>\r\n","output":"<p>Output a single integer, the total number of ways to play a game that will prevent Darko and Marko from fighting modulo 10007.&nbsp;<\/p>\r\n","hint":"<p>This sample corresponds to illustrations on the previous page. Four valid sequences are (4, 8, 2), (4, 8, 6), (8, 4, 2) i (8, 4, 6).&nbsp;<\/p>\r\n","original":"1","html_title":"0","problem_lang_tcode":"English","sample_explain_1":"<p>This sample corresponds to illustrations on the previous page. Four valid sequences are (4, 8, 2), (4, 8, 6), (8, 4, 2) and (8, 4, 6).<\/p>\r\n","sample_explain_2":"<p>Five valid sequences are (3, 1), (5, 2), (4, 4), (4, 1) and (4, 2).<\/p>\r\n","sample_explain_3":"<p>All cookies share the same type, so Darko and Marko can&#39;t get into fight no matter what. In each step Mara can say any integer remaining on the table, so the total number of games is equal to 11&middot;9&middot;7&middot;5&middot;3 = 10395. 388 is the remainder of division by 10007.<\/p>\r\n"}]

출처

Olympiad > Croatian Highschool Competitions in Informatics > 2010 > Final Exam #1 2번

  • 문제를 번역한 사람: baekjoon
  • 문제의 오타를 찾은 사람: chan4928