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29753번 - 최소 성적 다국어

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문제

이번 학기에 받아야 하는 최소 평균 평점 기준과 수강한 과목 중 한 과목을 제외한 모든 과목의 성적이 주어졌을 때, 최소 평균 평점 기준을 충족하기 위해 받아야 하는 나머지 한 과목의 최소 성적을 출력하시오. 성적에 따른 평점 환산표는 다음과 같다.

성적 A+ A0 B+ B0 C+ C0 D+ D0 F
평점 4.50 4.00 3.50 3.00 2.50 2.00 1.50 1.00 0.00

이번 학기의 평균 평점은 $($과목별 $($학점 $\times$ 평점$)$의 합 $\div$ 이번 학기에 수강한 과목의 학점 총합$)$을 소수점 이하 세 번째 자리에서 버림한 값이며, 이번 학기의 평균 평점이 최소 평균 평점 기준을 초과하는 경우 최소 평균 평점 기준을 충족한 것으로 인정된다. 단, 실수 자료형을 사용할 경우 부동 소수점 오차가 발생할 수 있으므로 주의하라.

입력

첫 번째 줄에 이번 학기에 수강한 과목 수 $N$과 이번 학기에 받아야 하는 최소 평균 평점 기준 $X$가 공백으로 구분되어 주어진다. $(2 \le N \le 24;$ 0ドル.00 \le X \le 4.50;$ $X$는 소수점 이하 두 자리까지 주어지는 실수$)$

두 번째 줄부터 $N - 1$개의 줄에 걸쳐 각 과목의 학점 $c_i$와 성적 $g_i$가 공백으로 구분되어 주어진다. $(1 \le c_i \le 6;$ $g_i$는 A+, A0, B+, B0, C+, C0, D+, D0, F중 하나$)$

그다음 줄에는 나머지 한 과목의 학점 $L$이 주어진다. $(1 \le L\le 6)$

출력

최소 평균 평점 기준을 충족하기 위해 받아야 하는 나머지 한 과목의 최소 성적을 출력한다. 만약 어떤 성적을 받아도 최소 평균 평점 기준을 충족할 수 없다면 "impossible"을 출력한다.

제한

예제 입력 1

5 3.59
4 A+
3 B+
3 C+
1 D0
3

예제 출력 1

A+

나머지 한 과목의 성적이 A+인 경우, 이번 학기의 평균 평점은 $\left( (4 \times 4.5) + (3 \times 3.5) + (3 \times 2.5) + (1 \times 1.0) + (3 \times 4.5) \right)\ ÷\ \left( 4 + 3 + 3 + 1 + 3 \right)\ =\ 3.60714285\cdots$를 소수점 이하 세 번째 자리에서 버림한 값인 3ドル.60$이 된다.

예제 입력 2

3 4.44
5 A+
4 A+
1

예제 출력 2

A0

예제 입력 3

5 2.54
3 B+
2 B0
2 C+
2 C0
1

예제 출력 3

F

예제 입력 4

5 3.60
4 A+
3 B+
3 C+
1 D0
3

예제 출력 4

impossible

나머지 한 과목의 성적이 A+인 경우의 이번 학기의 평균 평점 3ドル.60$은 최소 평균 평점 기준인 3ドル.60$을 초과하지 않으므로, 최소 평균 평점 기준을 충족할 수 없다.

힌트

[{"problem_id":"29753","problem_lang":"0","title":"\ucd5c\uc18c \uc131\uc801","description":"<p>\uc774\ubc88 \ud559\uae30\uc5d0 \ubc1b\uc544\uc57c \ud558\ub294 \ucd5c\uc18c \ud3c9\uade0 \ud3c9\uc810 \uae30\uc900\uacfc \uc218\uac15\ud55c \uacfc\ubaa9 \uc911 \ud55c \uacfc\ubaa9\uc744 \uc81c\uc678\ud55c \ubaa8\ub4e0 \uacfc\ubaa9\uc758 \uc131\uc801\uc774 \uc8fc\uc5b4\uc84c\uc744 \ub54c, \ucd5c\uc18c \ud3c9\uade0 \ud3c9\uc810 \uae30\uc900\uc744 \ucda9\uc871\ud558\uae30 \uc704\ud574 \ubc1b\uc544\uc57c \ud558\ub294 \ub098\uba38\uc9c0 \ud55c \uacfc\ubaa9\uc758 \ucd5c\uc18c \uc131\uc801\uc744 \ucd9c\ub825\ud558\uc2dc\uc624. \uc131\uc801\uc5d0 \ub530\ub978 \ud3c9\uc810 \ud658\uc0b0\ud45c\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\r\n\r\n<div style=\"overflow:auto;max-width:calc(100vw - 30px)\">\r\n<table align=\"center\" border=\"1\" cellpadding=\"1\" cellspacing=\"1\" class=\"table table-bordered\" style=\"table-layout: fixed; text-align: center; width: 600px; height: 60px;\">\r\n\t<tbody>\r\n\t\t<tr>\r\n\t\t\t<th scope=\"row\" style=\"text-align: center; width: 75px;\">\uc131\uc801<\/th>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">A+<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">A0<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">B+<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">B0<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">C+<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">C0<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">D+<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">D0<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">F<\/td>\r\n\t\t<\/tr>\r\n\t\t<tr>\r\n\t\t\t<th scope=\"row\" style=\"text-align: center; width: 75px;\">\ud3c9\uc810<\/th>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">4.50<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">4.00<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">3.50<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">3.00<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">2.50<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">2.00<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">1.50<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">1.00<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">0.00<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n<\/div>\r\n\r\n<p>\uc774\ubc88 \ud559\uae30\uc758 \ud3c9\uade0 \ud3c9\uc810\uc740 $($\uacfc\ubaa9\ubcc4 $($\ud559\uc810 $\\times$ \ud3c9\uc810$)$\uc758 \ud569 $\\div$ \uc774\ubc88 \ud559\uae30\uc5d0 \uc218\uac15\ud55c \uacfc\ubaa9\uc758 \ud559\uc810 \ucd1d\ud569$)$\uc744 \uc18c\uc218\uc810 \uc774\ud558 \uc138 \ubc88\uc9f8 \uc790\ub9ac\uc5d0\uc11c \ubc84\ub9bc\ud55c \uac12\uc774\uba70, \uc774\ubc88 \ud559\uae30\uc758 \ud3c9\uade0 \ud3c9\uc810\uc774 \ucd5c\uc18c \ud3c9\uade0 \ud3c9\uc810 \uae30\uc900\uc744 <strong>\ucd08\uacfc<\/strong>\ud558\ub294 \uacbd\uc6b0 \ucd5c\uc18c \ud3c9\uade0 \ud3c9\uc810 \uae30\uc900\uc744 \ucda9\uc871\ud55c \uac83\uc73c\ub85c \uc778\uc815\ub41c\ub2e4. <strong>\ub2e8, \uc2e4\uc218 \uc790\ub8cc\ud615\uc744 \uc0ac\uc6a9\ud560 \uacbd\uc6b0 \ubd80\ub3d9 \uc18c\uc218\uc810 \uc624\ucc28\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \uc8fc\uc758\ud558\ub77c.<\/strong><\/p>\r\n","input":"<p>\uccab \ubc88\uc9f8 \uc904\uc5d0 \uc774\ubc88 \ud559\uae30\uc5d0 \uc218\uac15\ud55c \uacfc\ubaa9 \uc218 $N$\uacfc \uc774\ubc88 \ud559\uae30\uc5d0 \ubc1b\uc544\uc57c \ud558\ub294 \ucd5c\uc18c \ud3c9\uade0 \ud3c9\uc810 \uae30\uc900 $X$\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4. $(2 \\le N \\le 24;$ $0.00 \\le X \\le 4.50;$ $X$\ub294 \uc18c\uc218\uc810 \uc774\ud558 \ub450 \uc790\ub9ac\uae4c\uc9c0 \uc8fc\uc5b4\uc9c0\ub294 \uc2e4\uc218$)$<\/p>\r\n\r\n<p>\ub450 \ubc88\uc9f8 \uc904\ubd80\ud130 $N - 1$\uac1c\uc758 \uc904\uc5d0 \uac78\uccd0 \uac01 \uacfc\ubaa9\uc758 \ud559\uc810 $c_i$\uc640 \uc131\uc801 $g_i$\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4. $(1 \\le c_i \\le 6;$ $g_i$\ub294 <span style=\"color:#e74c3c;\"><code>A+<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>A0<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>B+<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>B0<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>C+<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>C0<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>D+<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>D0<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>F<\/code><\/span>\uc911 \ud558\ub098$)$<\/p>\r\n\r\n<p>\uadf8\ub2e4\uc74c \uc904\uc5d0\ub294 \ub098\uba38\uc9c0 \ud55c \uacfc\ubaa9\uc758 \ud559\uc810 $L$\uc774 \uc8fc\uc5b4\uc9c4\ub2e4. $(1 \\le L\\le 6)$<\/p>\r\n","output":"<p>\ucd5c\uc18c \ud3c9\uade0 \ud3c9\uc810 \uae30\uc900\uc744 \ucda9\uc871\ud558\uae30 \uc704\ud574 \ubc1b\uc544\uc57c \ud558\ub294 \ub098\uba38\uc9c0 \ud55c \uacfc\ubaa9\uc758 \ucd5c\uc18c \uc131\uc801\uc744 \ucd9c\ub825\ud55c\ub2e4. \ub9cc\uc57d \uc5b4\ub5a4 \uc131\uc801\uc744 \ubc1b\uc544\ub3c4 \ucd5c\uc18c \ud3c9\uade0 \ud3c9\uc810 \uae30\uc900\uc744 \ucda9\uc871\ud560 \uc218 \uc5c6\ub2e4\uba74 &quot;<span style=\"color:#e74c3c;\"><code>impossible<\/code><\/span>&quot;\uc744 \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"","original":"1","html_title":"0","problem_lang_tcode":"Korean","sample_explain_1":"<p>\ub098\uba38\uc9c0 \ud55c \uacfc\ubaa9\uc758 \uc131\uc801\uc774 <span style=\"color:#e74c3c;\"><code>A+<\/code><\/span>\uc778 \uacbd\uc6b0, \uc774\ubc88 \ud559\uae30\uc758 \ud3c9\uade0 \ud3c9\uc810\uc740 $\\left( (4 \\times 4.5) +&nbsp;(3 \\times 3.5) +&nbsp;(3 \\times 2.5) +&nbsp;(1 \\times 1.0) + (3 \\times 4.5) \\right)\\ &divide;\\ \\left( 4 + 3 + 3 + 1 + 3 \\right)\\ =\\ 3.60714285\\cdots$\ub97c \uc18c\uc218\uc810 \uc774\ud558 \uc138 \ubc88\uc9f8 \uc790\ub9ac\uc5d0\uc11c \ubc84\ub9bc\ud55c \uac12\uc778 $3.60$\uc774 \ub41c\ub2e4.<\/p>\r\n","sample_explain_4":"<p>\ub098\uba38\uc9c0 \ud55c \uacfc\ubaa9\uc758 \uc131\uc801\uc774 <span style=\"color:#e74c3c;\"><code>A+<\/code><\/span>\uc778 \uacbd\uc6b0\uc758 \uc774\ubc88 \ud559\uae30\uc758 \ud3c9\uade0 \ud3c9\uc810 $3.60$\uc740 \ucd5c\uc18c \ud3c9\uade0 \ud3c9\uc810 \uae30\uc900\uc778 $3.60$\uc744 \ucd08\uacfc\ud558\uc9c0 \uc54a\uc73c\ubbc0\ub85c, \ucd5c\uc18c \ud3c9\uade0 \ud3c9\uc810 \uae30\uc900\uc744 \ucda9\uc871\ud560 \uc218 \uc5c6\ub2e4.<\/p>\r\n"},{"problem_id":"29753","problem_lang":"1","title":"Minimum Grade","description":"<p>Given the minimum GPA criteria for this semester and the grades of all subjects taken except one, output the minimum letter&nbsp;grade required for the remaining subject to meet the minimum GPA criteria. The grade conversion table according to the scores is as follows:<\/p>\r\n\r\n<div style=\"overflow:auto;max-width:calc(100vw - 30px)\">\r\n<table align=\"center\" border=\"1\" cellpadding=\"1\" cellspacing=\"1\" class=\"table table-bordered\" style=\"table-layout: fixed; text-align: center; width: 600px; height: 60px;\">\r\n\t<tbody>\r\n\t\t<tr>\r\n\t\t\t<th scope=\"row\" style=\"text-align: center; width: 75px;\">Letter<\/th>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">A+<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">A0<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">B+<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">B0<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">C+<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">C0<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">D+<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">D0<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">F<\/td>\r\n\t\t<\/tr>\r\n\t\t<tr>\r\n\t\t\t<th scope=\"row\" style=\"text-align: center; width: 75px;\">Grade<\/th>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">4.50<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">4.00<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">3.50<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">3.00<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">2.50<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">2.00<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">1.50<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">1.00<\/td>\r\n\t\t\t<td style=\"text-align: center; width: 50px;\">0.00<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n<\/div>\r\n\r\n<p>The GPA for this semester is calculated as $($the sum of&nbsp;$($credits $\\times$ grade of each subject$)$ over all subjects$)\\div ($total credits taken this semester$)$, rounded down to the second decimal place. If the GPA for this semester <strong>exceeds<\/strong> the minimum GPA criteria, it is considered to have met the criteria. However, <strong>be careful of floating-point errors when using floating-point types<\/strong>.&nbsp;<\/p>\r\n","input":"<p>The first line contains the number of subjects taken this semester $N$&nbsp;and the minimum GPA criteria $X$ separated by a space. $(2 \\le&nbsp;N \\le&nbsp;24;$ $0.00 \\le&nbsp;X \\le&nbsp;4.50;$ $X$ is a real number given up to two decimal places$)$<\/p>\r\n\r\n<p>From the second line to the $N-1$th line, the credits $c_i$\u200b and the letter grade $g_i$\u200b of each subject are given separated by a space.&nbsp;$(1 \\le&nbsp;c_i \\le&nbsp;6;$ $g_i$ is one of&nbsp;<span style=\"color:#e74c3c;\"><code>A+<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>A0<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>B+<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>B0<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>C+<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>C0<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>D+<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>D0<\/code><\/span>, <span style=\"color:#e74c3c;\"><code>F<\/code><\/span>$)$<\/p>\r\n\r\n<p>The next line gives the credits $L$ of the remaining one subject. $(1 \\le&nbsp;L\\le&nbsp;6)$<\/p>\r\n","output":"<p>Output the minimum letter grade required for the remaining subject to meet the minimum GPA criteria. If it is impossible to meet the criteria regardless of the grade received, print &quot;<span style=\"color:#e74c3c;\"><code>impossible<\/code><\/span>&quot;.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"English","sample_explain_1":"<p>If the grade for the remaining subject is <span style=\"color:#e74c3c;\"><code>A+<\/code><\/span>, the GPA for this semester would be&nbsp;$\\left( (4 \\times 4.5) +&nbsp;(3 \\times 3.5) +&nbsp;(3 \\times 2.5) +&nbsp;(1 \\times 1.0) + (3 \\times 4.5) \\right)\\ &divide;\\ \\left( 4 + 3 + 3 + 1 + 3 \\right)\\ =\\ 3.60714285\\cdots$ rounded down to the second decimal place, $3.60$.<\/p>\r\n","sample_explain_4":"<p>Given that the GPA of $3.60$&nbsp;when the remaining subject is graded as <span style=\"color:#e74c3c;\"><code>A+<\/code><\/span> does not exceed the minimum GPA requirement of $3.60$, it is not possible to meet the minimum GPA criteria.<\/p>\r\n"}]

출처

University > 국민대학교 > 2023 국민대학교 알고리즘 콘테스트 > 2023 국민대학교 알고리즘 콘테스트 C번

University > 중앙대학교 > 중앙대학교 프로그래밍 경진대회 (CPC) > 2023 중앙대학교 프로그래밍 경진대회 (CPC) > Division 1 B번

University > 중앙대학교 > 중앙대학교 프로그래밍 경진대회 (CPC) > 2023 중앙대학교 프로그래밍 경진대회 (CPC) > Division 2 C번

University > 중앙대학교 > 중앙대학교 프로그래밍 경진대회 (CPC) > 2023 중앙대학교 프로그래밍 경진대회 (CPC) > Open Contest C번

University > 국민대학교 > 2023 국민대학교 알고리즘 콘테스트 > Open Contest C번

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