시간 제한 메모리 제한 제출 정답 맞은 사람 정답 비율
1 초 128 MB 18 4 3 18.750%

문제

대혁이는 교사이다. 하지만 대혁이의 수업은 무척이나 지루하다. 그래서 학생들은 수업도중에 빙고를 하기 시작하였다. 하지만 대혁이는 눈치가 빨라서 이미 모든걸 알고 있었다.  대혁이는 학생들을 혼내기 전에 한 번의 게임에 필요한 평균적인 단어수를 구하려고 한다.

학생들은 영어를 무척이나 잘해서 모든 단어는 알파벳으로 되어있는 단어만 말하고 알파벳은 소문자와 대문자 둘 다 가능하다.  학생들은 대혁이를 혼란시키기 위해 알파벳 시작 중간 끝에 알파벳이 아닌 다른 문자를 넣기로 하였다. 

하지만 몇몇의 어리석은 학생들이 빙고가 되면 "BULLSHIT"이라고  외쳤고 대혁이는 이 단어를 통해 게임이 끝났다는 것을 알아냈다. 또한 이 학생들은 같은 단어를 말하기도 하였는데, 이는 당연히 하나로 간주한다. 또한, Bingo와 bingo는 같은 단어로 간주한다. 즉, 대소문자는 구별하지 않는다.

대혁이는 수업을 하려하기 때문에 당신이 프로그램을 만들어 학생들이 얼마나 게임을 하고 얼마나 단어를 불렀는지 알아내도록 하자.

입력

입력은 여러 문장이 입력되며 중간중간 "BULLSHIT"이 섞여 있다. 

"BULLSHIT"은 한 게임이 끝났음을 알려주고 있다.

또한 다음과 같은 규칙을 따른다.

  • "BULLSHIT"은 언제나 대문자로 입력된다.
  • 모든 단어는 최대 25글자이며 한 문장은 최대 100글자이다.
  • 게임이 끝나기 전에 최대 500개의 서로 다른 단어가 들어온다.
  • 학생들은 룰을 굉장히 잘 따르기 때문에 게임이 불가한지는 체크하지 않아도 된다.

출력

출력은 한 번의 게임이 종료될때 몇번의 단어가 불려지는지 평균을 구하려고 한다. 답은 소수가 아닌 분수로 표기하며 분모와 분자의 공통 약수는 1만 존재한다. 즉, 게임이 10번 진행되고 단어가 55번 진행되었다면 출력은 "11 / 2"가 되어야 한다. 

예제 입력 1

Programming languages can be classified BULLSHIT into following types:
- imperative and BULLSHIT procedural languages
- functional languages
- logical BULLSHIT programming languages
- object-oriented BULLSHIT languages

예제 출력 1

9 / 2
[{"problem_id":"6527","problem_lang":"0","title":"\ube59\uace0\ub77c\ub2c8!","description":"<p>\ub300\ud601\uc774\ub294 \uad50\uc0ac\uc774\ub2e4. \ud558\uc9c0\ub9cc \ub300\ud601\uc774\uc758 \uc218\uc5c5\uc740 \ubb34\ucc99\uc774\ub098 \uc9c0\ub8e8\ud558\ub2e4. \uadf8\ub798\uc11c \ud559\uc0dd\ub4e4\uc740 \uc218\uc5c5\ub3c4\uc911\uc5d0 \ube59\uace0\ub97c \ud558\uae30 \uc2dc\uc791\ud558\uc600\ub2e4. \ud558\uc9c0\ub9cc \ub300\ud601\uc774\ub294 \ub208\uce58\uac00 \ube68\ub77c\uc11c \uc774\ubbf8 \ubaa8\ub4e0\uac78 \uc54c\uace0 \uc788\uc5c8\ub2e4. &nbsp;\ub300\ud601\uc774\ub294 \ud559\uc0dd\ub4e4\uc744 \ud63c\ub0b4\uae30 \uc804\uc5d0 \ud55c \ubc88\uc758 \uac8c\uc784\uc5d0 \ud544\uc694\ud55c \ud3c9\uade0\uc801\uc778 \ub2e8\uc5b4\uc218\ub97c \uad6c\ud558\ub824\uace0 \ud55c\ub2e4.<\/p>\r\n\r\n<p>\ud559\uc0dd\ub4e4\uc740 \uc601\uc5b4\ub97c \ubb34\ucc99\uc774\ub098 \uc798\ud574\uc11c \ubaa8\ub4e0 \ub2e8\uc5b4\ub294 \uc54c\ud30c\ubcb3\uc73c\ub85c \ub418\uc5b4\uc788\ub294 \ub2e8\uc5b4\ub9cc \ub9d0\ud558\uace0 \uc54c\ud30c\ubcb3\uc740 \uc18c\ubb38\uc790\uc640 \ub300\ubb38\uc790 \ub458 \ub2e4 \uac00\ub2a5\ud558\ub2e4. &nbsp;\ud559\uc0dd\ub4e4\uc740 \ub300\ud601\uc774\ub97c \ud63c\ub780\uc2dc\ud0a4\uae30 \uc704\ud574 \uc54c\ud30c\ubcb3 \uc2dc\uc791 \uc911\uac04 \ub05d\uc5d0 \uc54c\ud30c\ubcb3\uc774 \uc544\ub2cc \ub2e4\ub978 \ubb38\uc790\ub97c \ub123\uae30\ub85c \ud558\uc600\ub2e4.&nbsp;<\/p>\r\n\r\n<p>\ud558\uc9c0\ub9cc \uba87\uba87\uc758 \uc5b4\ub9ac\uc11d\uc740 \ud559\uc0dd\ub4e4\uc774 \ube59\uace0\uac00 \ub418\uba74 &quot;BULLSHIT&quot;\uc774\ub77c\uace0 &nbsp;\uc678\ucce4\uace0 \ub300\ud601\uc774\ub294 \uc774 \ub2e8\uc5b4\ub97c \ud1b5\ud574 \uac8c\uc784\uc774 \ub05d\ub0ac\ub2e4\ub294 \uac83\uc744 \uc54c\uc544\ub0c8\ub2e4. \ub610\ud55c \uc774 \ud559\uc0dd\ub4e4\uc740 \uac19\uc740 \ub2e8\uc5b4\ub97c \ub9d0\ud558\uae30\ub3c4 \ud558\uc600\ub294\ub370, \uc774\ub294&nbsp;\ub2f9\uc5f0\ud788 \ud558\ub098\ub85c \uac04\uc8fc\ud55c\ub2e4. \ub610\ud55c, Bingo\uc640 bingo\ub294 \uac19\uc740 \ub2e8\uc5b4\ub85c \uac04\uc8fc\ud55c\ub2e4. \uc989, \ub300\uc18c\ubb38\uc790\ub294 \uad6c\ubcc4\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/p>\r\n\r\n<p>\ub300\ud601\uc774\ub294 \uc218\uc5c5\uc744 \ud558\ub824\ud558\uae30 \ub54c\ubb38\uc5d0 \ub2f9\uc2e0\uc774 \ud504\ub85c\uadf8\ub7a8\uc744 \ub9cc\ub4e4\uc5b4 \ud559\uc0dd\ub4e4\uc774 \uc5bc\ub9c8\ub098 \uac8c\uc784\uc744 \ud558\uace0 \uc5bc\ub9c8\ub098 \ub2e8\uc5b4\ub97c \ubd88\ub800\ub294\uc9c0 \uc54c\uc544\ub0b4\ub3c4\ub85d \ud558\uc790.<\/p>\r\n","input":"<p>\uc785\ub825\uc740 \uc5ec\ub7ec \ubb38\uc7a5\uc774 \uc785\ub825\ub418\uba70 \uc911\uac04\uc911\uac04 &quot;BULLSHIT&quot;\uc774 \uc11e\uc5ec \uc788\ub2e4.&nbsp;<\/p>\r\n\r\n<p>&quot;BULLSHIT&quot;\uc740 \ud55c \uac8c\uc784\uc774 \ub05d\ub0ac\uc74c\uc744 \uc54c\ub824\uc8fc\uace0 \uc788\ub2e4.<\/p>\r\n\r\n<p>\ub610\ud55c \ub2e4\uc74c\uacfc \uac19\uc740 \uaddc\uce59\uc744 \ub530\ub978\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>&quot;BULLSHIT&quot;\uc740 \uc5b8\uc81c\ub098 \ub300\ubb38\uc790\ub85c \uc785\ub825\ub41c\ub2e4.<\/li>\r\n\t<li>\ubaa8\ub4e0 \ub2e8\uc5b4\ub294 \ucd5c\ub300 25\uae00\uc790\uc774\uba70 \ud55c \ubb38\uc7a5\uc740 \ucd5c\ub300 100\uae00\uc790\uc774\ub2e4.<\/li>\r\n\t<li>\uac8c\uc784\uc774 \ub05d\ub098\uae30 \uc804\uc5d0 \ucd5c\ub300 500\uac1c\uc758 \uc11c\ub85c \ub2e4\ub978 \ub2e8\uc5b4\uac00 \ub4e4\uc5b4\uc628\ub2e4.<\/li>\r\n\t<li>\ud559\uc0dd\ub4e4\uc740 \ub8f0\uc744 \uad49\uc7a5\ud788 \uc798 \ub530\ub974\uae30 \ub54c\ubb38\uc5d0 \uac8c\uc784\uc774 \ubd88\uac00\ud55c\uc9c0\ub294 \uccb4\ud06c\ud558\uc9c0 \uc54a\uc544\ub3c4 \ub41c\ub2e4.<\/li>\r\n<\/ul>\r\n","output":"<p>\ucd9c\ub825\uc740 \ud55c \ubc88\uc758 \uac8c\uc784\uc774 \uc885\ub8cc\ub420\ub54c \uba87\ubc88\uc758 \ub2e8\uc5b4\uac00 \ubd88\ub824\uc9c0\ub294\uc9c0 \ud3c9\uade0\uc744 \uad6c\ud558\ub824\uace0 \ud55c\ub2e4. \ub2f5\uc740 \uc18c\uc218\uac00 \uc544\ub2cc \ubd84\uc218\ub85c \ud45c\uae30\ud558\uba70 \ubd84\ubaa8\uc640 \ubd84\uc790\uc758 \uacf5\ud1b5 \uc57d\uc218\ub294 1\ub9cc \uc874\uc7ac\ud55c\ub2e4. \uc989, \uac8c\uc784\uc774 10\ubc88 \uc9c4\ud589\ub418\uace0 \ub2e8\uc5b4\uac00 55\ubc88 \uc9c4\ud589\ub418\uc5c8\ub2e4\uba74 \ucd9c\ub825\uc740 &quot;11 \/&nbsp;2&quot;\uac00 \ub418\uc5b4\uc57c \ud55c\ub2e4.&nbsp;<\/p>\r\n","hint":"","original":"0","problem_lang_code":"\ud55c\uad6d\uc5b4"},{"problem_id":"6527","problem_lang":"1","title":"Bullshit Bingo","description":"<p>Bullshit Bingo is a game to make lectures, seminars or meetings less boring. Every player has a card with 5 rows and 5 columns. Each of the 25 cells contains a word (the cell in the middle has always the word &quot;BINGO&quot; written in it). Whenever a player hears a word which is written on his card, he can mark it. The cell in the middle is already marked when the game starts. If a player has marked all the words in a row, a column or a diagonal, he stands up and shouts &quot;BULLSHIT&quot;. After this, the game starts over again.<\/p>\r\n\r\n<p>Sitting in a lecture, you observe that some students in the audience are playing Bullshit Bingo. You wonder what the average number of different words is until &quot;BULLSHIT&quot; is exclaimed. For the purpose of this problem, a word consists of letters of the English alphabet (&#39;a&#39; to &#39;z&#39; or &#39;A&#39; to &#39;Z&#39;). Words are separated by characters other than letters (for example spaces, digits or punctuation). Do the comparison of words case-insensitively, i.e., &quot;Bingo&quot; is the same word as &quot;bingo&quot;. When counting the number of different words, ignore the word BULLSHIT (indicating the end of the game), and consider only the words of the current game, i.e., if a word has already occurred in a previous game, you may still count it in the current game. If the last game is unfinished, ignore the words of that game.<\/p>\r\n","input":"<p>The input file consists of the text of the lecture, with &quot;BULLSHIT&quot; occurring occasionally. The first game starts with the first word in the input. Each occurrence of &quot;BULLSHIT&quot; indicates the end of one game.<\/p>\r\n\r\n<p>You may assume, that<\/p>\r\n\r\n<ul>\r\n\t<li>the word &quot;BULLSHIT&quot; occurs only in uppercase letters<\/li>\r\n\t<li>every word has at most 25 characters, and each line has at most 100 characters<\/li>\r\n\t<li>there are at most 500 different words before a game ends<\/li>\r\n\t<li>the players follow the rules, so there is no need to check if a game is valid or not<\/li>\r\n<\/ul>\r\n","output":"<p>The output consists of one number: the average number of different words needed to win a game. Write the number as a reduced fraction in the format shown below. Reduced fraction means that there should be no integer greater than 1 which divides both the numerator and denominator. For example if there were 10 games, and the number of different words in each game summed up to 55, print &quot;11 \/ 2&quot;.<\/p>\r\n","hint":"","original":"1","problem_lang_code":"\uc601\uc5b4"}]

출처

Contest > University of Ulm Local Contest > University of Ulm Local Contest 2005 B번

  • 문제의 오타를 찾은 사람: jh05013
  • 문제를 번역한 사람: temp