시간 제한메모리 제한제출정답맞힌 사람정답 비율
1 초 128 MB97042035251.163%

문제

현우는 방금 선생님으로부터 역사 시험 결과를 받았다. 현우가 가장 열심히 공부한 문제는 임진왜란의 해전을 일어난 순서대로 적는 문제이다.

올바른 순서는 다음과 같다.

1. 옥포 해전 2. 사천 해전 3. 한산도 대첩 4. 명량 해전 5. 노량 해전

현우는 정말 열심히 공부했고, 옥포 해전을 제외한 모든 해전의 날짜를 외웠다. 따라서, 현우는 옥포 해전이 가장 먼저 일어난 해전인지 마지막에 일어난 해전인지 생각해내지 못했고, 다음과 같이 결국 제일 마지막에 적고말았다.

1. 사천 해전 2. 한산도 대첩 3. 명량 해전 4. 노량 해전 5. 옥포 해전

현우가 적은 정답은 모든 위치에서 정답과 일치하지 않는다. 따라서 5개 해전 중에 4개 해전의 순서를 올바르게 적었지만, 점수는 5점 만점에 0점이 된다.

현우는 이러한 채점 방식이 큰 문제가 있다고 생각했다.

현우는 선생님께 해전이 일어난 정확한 연도도 중요하지만, 상대적인 관계가 훨씬 더 중요하다고 말했고, 선생님은 현우의 의견을 받아들여 이 문제를 다시 채점하기로 했다.

선생님이 다시 사용한 채점 방법은 두 해전을 골라 순서가 일치하면 점수를 주는 방법이다. 즉, 선생님은 학생의 답 중에 N(N-1)/2개의 쌍을 모두 고른뒤, 올바른 순서로 적혀져 있으면 1점을 주려고 한다. 최종 점수는 획득점수/(N(N-1)/2)가 된다.

문제의 정답과 현우가 작성한 답안이 주어졌을 때, 현우의 점수를 구하는 프로그램을 작성하시오.

입력

첫째 줄에 해전의 개수 N이 주어진다. (2 ≤ N ≤ 2500) 다음 줄에는 올바른 정답이 공백으로 구분되어 주어진다. 그 다음 줄에는 현우가 작성한 답안이 공백으로 구분되어 주어진다. 해전의 이름은 3글자~15글자 알파벳 소문자로 이루어져 있다.

출력

현우가 획득한 점수를 a/b로 출력한다. (약분 하면 안 된다)

예제 입력 1

5
okpo sacheon hansan myeongnyang noryang
sacheon hansan myeongnyang noryang okpo

예제 출력 1

6/10

예제 입력 2

3
alpha beta gamma
alpha gamma beta

예제 출력 2

2/3

예제 입력 3

5
naboo geonosis yavin hoth endor
geonosis yavin hoth endor naboo

예제 출력 3

6/10
[{"problem_id":"3077","problem_lang":"0","title":"\uc784\uc9c4\uc65c\ub780","description":"<p>\ud604\uc6b0\ub294 \ubc29\uae08 \uc120\uc0dd\ub2d8\uc73c\ub85c\ubd80\ud130 \uc5ed\uc0ac \uc2dc\ud5d8 \uacb0\uacfc\ub97c \ubc1b\uc558\ub2e4. \ud604\uc6b0\uac00 \uac00\uc7a5 \uc5f4\uc2ec\ud788 \uacf5\ubd80\ud55c \ubb38\uc81c\ub294 \uc784\uc9c4\uc65c\ub780\uc758 \ud574\uc804\uc744 \uc77c\uc5b4\ub09c \uc21c\uc11c\ub300\ub85c \uc801\ub294 \ubb38\uc81c\uc774\ub2e4.<\/p>\r\n\r\n<p>\uc62c\ubc14\ub978 \uc21c\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\r\n\r\n<p>1. \uc625\ud3ec \ud574\uc804 2. \uc0ac\ucc9c \ud574\uc804 3. \ud55c\uc0b0\ub3c4 \ub300\ucca9&nbsp;4. \uba85\ub7c9 \ud574\uc804 5. \ub178\ub7c9 \ud574\uc804<\/p>\r\n\r\n<p>\ud604\uc6b0\ub294 \uc815\ub9d0 \uc5f4\uc2ec\ud788 \uacf5\ubd80\ud588\uace0, \uc625\ud3ec \ud574\uc804\uc744 \uc81c\uc678\ud55c \ubaa8\ub4e0 \ud574\uc804\uc758 \ub0a0\uc9dc\ub97c \uc678\uc6e0\ub2e4. \ub530\ub77c\uc11c, \ud604\uc6b0\ub294 \uc625\ud3ec \ud574\uc804\uc774 \uac00\uc7a5 \uba3c\uc800 \uc77c\uc5b4\ub09c \ud574\uc804\uc778\uc9c0 \ub9c8\uc9c0\ub9c9\uc5d0 \uc77c\uc5b4\ub09c \ud574\uc804\uc778\uc9c0 \uc0dd\uac01\ud574\ub0b4\uc9c0 \ubabb\ud588\uace0, \ub2e4\uc74c\uacfc \uac19\uc774 \uacb0\uad6d \uc81c\uc77c \ub9c8\uc9c0\ub9c9\uc5d0 \uc801\uace0\ub9d0\uc558\ub2e4.<\/p>\r\n\r\n<p>1. \uc0ac\ucc9c \ud574\uc804 2. \ud55c\uc0b0\ub3c4 \ub300\ucca9 3. \uba85\ub7c9 \ud574\uc804 4. \ub178\ub7c9 \ud574\uc804&nbsp;5. \uc625\ud3ec \ud574\uc804<\/p>\r\n\r\n<p>\ud604\uc6b0\uac00 \uc801\uc740 \uc815\ub2f5\uc740 \ubaa8\ub4e0 \uc704\uce58\uc5d0\uc11c \uc815\ub2f5\uacfc \uc77c\uce58\ud558\uc9c0 \uc54a\ub294\ub2e4. \ub530\ub77c\uc11c 5\uac1c \ud574\uc804 \uc911\uc5d0 4\uac1c \ud574\uc804\uc758 \uc21c\uc11c\ub97c \uc62c\ubc14\ub974\uac8c \uc801\uc5c8\uc9c0\ub9cc, \uc810\uc218\ub294 5\uc810 \ub9cc\uc810\uc5d0 0\uc810\uc774 \ub41c\ub2e4.<\/p>\r\n\r\n<p>\ud604\uc6b0\ub294 \uc774\ub7ec\ud55c \ucc44\uc810 \ubc29\uc2dd\uc774 \ud070 \ubb38\uc81c\uac00 \uc788\ub2e4\uace0 \uc0dd\uac01\ud588\ub2e4.<\/p>\r\n\r\n<p>\ud604\uc6b0\ub294 \uc120\uc0dd\ub2d8\uaed8 \ud574\uc804\uc774 \uc77c\uc5b4\ub09c \uc815\ud655\ud55c \uc5f0\ub3c4\ub3c4 \uc911\uc694\ud558\uc9c0\ub9cc, \uc0c1\ub300\uc801\uc778 \uad00\uacc4\uac00 \ud6e8\uc52c \ub354 \uc911\uc694\ud558\ub2e4\uace0 \ub9d0\ud588\uace0, \uc120\uc0dd\ub2d8\uc740 \ud604\uc6b0\uc758 \uc758\uacac\uc744 \ubc1b\uc544\ub4e4\uc5ec \uc774 \ubb38\uc81c\ub97c \ub2e4\uc2dc \ucc44\uc810\ud558\uae30\ub85c \ud588\ub2e4.<\/p>\r\n\r\n<p>\uc120\uc0dd\ub2d8\uc774 \ub2e4\uc2dc \uc0ac\uc6a9\ud55c \ucc44\uc810 \ubc29\ubc95\uc740 \ub450 \ud574\uc804\uc744 \uace8\ub77c \uc21c\uc11c\uac00 \uc77c\uce58\ud558\uba74 \uc810\uc218\ub97c \uc8fc\ub294 \ubc29\ubc95\uc774\ub2e4. \uc989, \uc120\uc0dd\ub2d8\uc740 \ud559\uc0dd\uc758 \ub2f5 \uc911\uc5d0 N(N-1)\/2\uac1c\uc758 \uc30d\uc744 \ubaa8\ub450 \uace0\ub978\ub4a4, \uc62c\ubc14\ub978 \uc21c\uc11c\ub85c \uc801\ud600\uc838 \uc788\uc73c\uba74 1\uc810\uc744 \uc8fc\ub824\uace0 \ud55c\ub2e4. \ucd5c\uc885 \uc810\uc218\ub294 \ud68d\ub4dd\uc810\uc218\/(N(N-1)\/2)\uac00 \ub41c\ub2e4.<\/p>\r\n\r\n<p>\ubb38\uc81c\uc758 \uc815\ub2f5\uacfc \ud604\uc6b0\uac00 \uc791\uc131\ud55c \ub2f5\uc548\uc774 \uc8fc\uc5b4\uc84c\uc744 \ub54c, \ud604\uc6b0\uc758 \uc810\uc218\ub97c \uad6c\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\uc2dc\uc624.<\/p>\r\n","input":"<p>\uccab\uc9f8 \uc904\uc5d0 \ud574\uc804\uc758 \uac1c\uc218 N\uc774 \uc8fc\uc5b4\uc9c4\ub2e4. (2 &le; N &le; 2500) \ub2e4\uc74c \uc904\uc5d0\ub294 \uc62c\ubc14\ub978 \uc815\ub2f5\uc774 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4. \uadf8 \ub2e4\uc74c \uc904\uc5d0\ub294 \ud604\uc6b0\uac00 \uc791\uc131\ud55c \ub2f5\uc548\uc774 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4. \ud574\uc804\uc758 \uc774\ub984\uc740 3\uae00\uc790~15\uae00\uc790 \uc54c\ud30c\ubcb3 \uc18c\ubb38\uc790\ub85c \uc774\ub8e8\uc5b4\uc838 \uc788\ub2e4.<\/p>\r\n","output":"<p>\ud604\uc6b0\uac00 \ud68d\ub4dd\ud55c \uc810\uc218\ub97c a\/b\ub85c \ucd9c\ub825\ud55c\ub2e4. (\uc57d\ubd84 \ud558\uba74 \uc548 \ub41c\ub2e4)<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"Korean"},{"problem_id":"3077","problem_lang":"1","title":"POREDAK","description":"<p>Mirko-wan has just received the results of his history exam. One of the problems was putting famous historical battles into chronological order. The correct order was:<\/p>\r\n\r\n<p>1. Blockade of Naboo 2. Battle of Geonosis 3. Battle of Yavin 4. Battle of Hoth 5. Battle of Endor<\/p>\r\n\r\n<p>Mirko-wan has studied (relatively) hard for the exam, so he remembered the exact years of all battles, except for the Blockade of Naboo. He couldn&#39;t remember anything about it, so he randomly placed it last instead of first, obtaining the order:<\/p>\r\n\r\n<p>1. Battle of Geonosis 2. Battle of Yavin 3. Battle of Hoth 4. Battle of Endor 5. Blockade of Naboo<\/p>\r\n\r\n<p>Since Mirko-wan&#39;s order doesn&#39;t match the correct solution at any index, Mirko-wan&#39;s score on that problem was &ndash; to his disappointment &ndash; 0 out of 5 points, even though he knew the correct order of four out of five battles!<\/p>\r\n\r\n<p>This opens the question of fair scoring of an ordering problem. The example given above suggests that scoring by counting the number of items in the correct absolute position isn&#39;t fair. Is there a better way?<\/p>\r\n\r\n<p>One possibility is finding the longest subsequence (not necessarily contiguous) of correctly ordered items. This isn&#39;t the best solution either: if an item is displaced by just one position from the correct order, the score that it awards drops to zero, even though it was almost correctly ordered.<\/p>\r\n\r\n<p>Mirko-wan has thus suggested (using the MAWT &ndash; Might As Well Try a Mind Trick approach) the following scoring method to his history teacher. For every two items, the student will receive 1 point if the two items are in mutually correct order. In other words, the number of points is the number of item pairs that the student has correctly ordered. The maximum number of points is then, of course, the total number of pairs, which equals N * (N - 1) \/ 2, where N is the total number of entries.<\/p>\r\n","input":"<p>The first line of input contains the positive integer N (2 &le; N &le; 2500), the number of items. The items are distinct words consisting of 3 to 15 lowercase English letters.<\/p>\r\n\r\n<p>The second line of input contains the N items, space-separated, listed in the correct order.<\/p>\r\n\r\n<p>The third line of input contains the N items, space-separated, listed in Mirko-wan&#39;s order.<\/p>\r\n","output":"<p>The first and only line of output must contain, with no spaces, the following: the number of points that Mirko-wan would earn using his scoring method, a \/ (forward slash) character, and the maximum possible number of points for that problem (again assuming Mirko-wan&#39;s scoring method). (This is the usual notation found on a typical graded exam.)<\/p>\r\n","hint":"","original":"1","html_title":"0","problem_lang_tcode":"English"}]

출처

Contest > Croatian Open Competition in Informatics > COCI 2012/2013 > Contest #3 2번