시간 제한메모리 제한제출정답맞힌 사람정답 비율
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문제

Albert는 등산을 즐겨한다.

Albert의 집 근처에는 동쪽과 서쪽에 각각 큰 산이 있고, 다양한 길이의 등산로가 마련되어있다.

동쪽 산에는 n개의 등산로가 있고 (편의상 이들의 길이를 A[1], ..., A[n]이라 하자) 서쪽 산에는 m개의 등산로가 있다 (편의상 이들의 길이를 B[1], ..., B[m]이라 하자).

동쪽 산의 n개의 등산로는 모두 같은 곳 (동쪽 산 출입구) 에서 시작하여 같은 곳에서 끝나고, 마찬가지로 서쪽 산의 m개의 등산로도 모두 같은 곳 (서쪽 산 출입구)에서 시작하여 같은 곳에서 끝난다.

동쪽 산과 서쪽 산의 입구는 길이가 x인 별도의 "동서 다리"를 통해 연결되어있다. 아래 그림에서 동쪽 산의 출입구는 정사각형으로, 서쪽 산의 출입구는 원으로 표시되어있고 두 출입구를 잇는 동서 다리의 길이는 x = 10 이다. 동쪽 산의 두 등산로의 길이는 각각 40과 45이고 서쪽 산의 두 등산로의 길이는 42로 동일하다.

Albert는 아래와 같은 규칙에 따라 총 길이가 C이상 D이하가 되도록 등산 계획을 세우고 싶다: (등산 계획은 어떤 등산로를 어떤 순서로 이용하는지 나타낸다)

  1. 같은 등산로는 최대 한 번만 이용한다.
  2. 같은 산의 등산로는 연속으로 이용하지 않는다 (즉, 동쪽 산과 서쪽 산의 등산로를 번갈아 이용한다).
  3. 어떤 산에서 다른 산으로 이동할 때에는 반드시 길이가 x인 동서 다리를 이용하며, 다른 길은 없다 (동서 다리는 여러 번 이용해도 된다).
  4. 동서 다리는 등산 계획의 맨 처음이나 맨 끝에 올 수 없고, 동서 다리는 연속으로 이용할 수 없다. 따라서 동서 다리를 이용할 경우 반드시 전/후에 동쪽 산 혹은 서쪽 산의 등산로를 이용해야 한다.

예를 들어, 위의 그림의 경우 n = m = 2, x = 10, A = [40, 45] 그리고 B = [42, 42] 이다. 이 때, C = 1, D = 100 이라 하자. 상기한 모든 규칙을 만족하며 길이가 1이상 100이하인 등산 계획은 총 12가지 있다:

  • 총 길이가 40이상 45이하인 등산 계획은 4가지 존재한다 (네개의 등산로 중 하나를 이용하면 된다).
  • 총 길이가 92이상 97이하인 등산 계획은 8가지 존재한다 (각 산에서 등산로 하나씩을 택한 후, 등산할 순서를 정하면 된다).

입력으로 n, m, x, C, D, 그리고 A, B가 주어졌을 때, Albert를 도와 총 몇가지 방법으로 등산 계획을 세울 수 있는지 구해보자.

입력

입력 첫 줄에 테스트 케이스의 수 T가 주어진다.

각 테스트 케이스는 세줄에 걸쳐 주어진다.

첫 줄에는 n, m, x, C, D가 공백으로 구분되어 주어진다.

둘째 줄에는 동쪽 하이킹 코스 길이를 나타내는 n개의 정수가 공백으로 구분되어 주어진다.

셋째 줄에는 서쪽 하이킹 코스 길이를 나타내는 m개의 정수가 공백으로 구분되어 주어진다.

출력

각 테스트 케이스의 정답을 각 줄에 출력한다. 단, 정답이 매우 클 수 있으므로 109+7로 나눈 나머지를 출력한다.

제한

  • 1 ≤ T ≤ 5
  • 1 ≤ n, m ≤ 18
  • 1 ≤ x ≤ 108
  • ​1 ​≤ C ≤ D ≤ 109
  • 1 ​​≤ 각 등산로의 길이 ≤ 108

예제 입력 1

3
3 5 100 245 245
10 20 30
1 2 3 4 5
5 5 1 39 39
1 2 3 4 5
5 4 3 2 1
5 5 1 1 3
1 1 1 1 1
1 1 1 1 1

예제 출력 1

2
28800
60

예제 1: 위 규칙을 만족하며 길이가 245인 등산 계획은 두 가지가 있다:

  • 방법 1: (등산로 A1) - (다리) - (등산로 B5) - (다리) - (등산로 A3)
  • 방법 2: (등산로 A3) - (다리) - (등산로 B5) - (다리) - (등산로 A1)

예제 2: 모든 10개의 등산로를 한 번씩 다 이용하면 (따라서 다리를 9번 지나면) 총 길이가 39가 된다.
위 규칙을 따르면서 10개의 등산로를 한 번씩 이용하는 방법은 총 28800가지가 있다.

예제 3: 

  • 총 길이가 1인 등산 계획은 10가지 존재한다 (아무 등산로 하나를 고르면 된다).
  • 총 길이가 2인 등산 계획은 0가지 존재한다.
  • 총 길이가 3인 등산 계획은 50가지 존재한다 (동쪽 산과 서쪽 산의 등산로 하나씩을 고르면 된다).

따라서 답은 60이다.

예제 입력 2

3
2 2 10 1 100
45 40
42 42
16 16 10 100 100
10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
18 18 100000000 900000000 900000000
100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000
100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000 100000000

예제 출력 2

12
0
2996352

예제 1: 본문에서 다루었다.

예제 2-3: 추가 설명 없음.

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\uacf3\uc5d0\uc11c \ub05d\ub098\uace0,&nbsp;\ub9c8\ucc2c\uac00\uc9c0\ub85c \uc11c\ucabd \uc0b0\uc758 m\uac1c\uc758 \ub4f1\uc0b0\ub85c\ub3c4&nbsp;\ubaa8\ub450 \uac19\uc740 \uacf3 (\uc11c\ucabd \uc0b0 \ucd9c\uc785\uad6c)\uc5d0\uc11c \uc2dc\uc791\ud558\uc5ec \uac19\uc740 \uacf3\uc5d0\uc11c \ub05d\ub09c\ub2e4.<\/p>\r\n\r\n<p>\ub3d9\ucabd \uc0b0\uacfc \uc11c\ucabd \uc0b0\uc758 \uc785\uad6c\ub294 \uae38\uc774\uac00 x\uc778 \ubcc4\ub3c4\uc758 &quot;\ub3d9\uc11c&nbsp;\ub2e4\ub9ac&quot;\ub97c \ud1b5\ud574 \uc5f0\uacb0\ub418\uc5b4\uc788\ub2e4. \uc544\ub798 \uadf8\ub9bc\uc5d0\uc11c \ub3d9\ucabd \uc0b0\uc758 \ucd9c\uc785\uad6c\ub294 \uc815\uc0ac\uac01\ud615\uc73c\ub85c, \uc11c\ucabd \uc0b0\uc758 \ucd9c\uc785\uad6c\ub294 \uc6d0\uc73c\ub85c \ud45c\uc2dc\ub418\uc5b4\uc788\uace0 \ub450 \ucd9c\uc785\uad6c\ub97c \uc787\ub294 \ub3d9\uc11c \ub2e4\ub9ac\uc758 \uae38\uc774\ub294 x = 10 \uc774\ub2e4. \ub3d9\ucabd \uc0b0\uc758&nbsp;\ub450 \ub4f1\uc0b0\ub85c\uc758 \uae38\uc774\ub294 \uac01\uac01 40\uacfc 45\uc774\uace0 \uc11c\ucabd \uc0b0\uc758 \ub450 \ub4f1\uc0b0\ub85c\uc758 \uae38\uc774\ub294 42\ub85c \ub3d9\uc77c\ud558\ub2e4.<\/p>\r\n\r\n<p style=\"text-align: center;\"><img alt=\"\" src=\"https:\/\/upload.acmicpc.net\/042ca582-1c9f-4cb7-a42d-7c4fc550e670\/-\/preview\/\" \/><\/p>\r\n\r\n<p>Albert\ub294 \uc544\ub798\uc640 \uac19\uc740 \uaddc\uce59\uc5d0 \ub530\ub77c \ucd1d \uae38\uc774\uac00 C\uc774\uc0c1 D\uc774\ud558\uac00 \ub418\ub3c4\ub85d \ub4f1\uc0b0 \uacc4\ud68d\uc744 \uc138\uc6b0\uace0 \uc2f6\ub2e4: (\ub4f1\uc0b0 \uacc4\ud68d\uc740 \uc5b4\ub5a4 \ub4f1\uc0b0\ub85c\ub97c \uc5b4\ub5a4 \uc21c\uc11c\ub85c \uc774\uc6a9\ud558\ub294\uc9c0 \ub098\ud0c0\ub0b8\ub2e4)<\/p>\r\n\r\n<ol>\r\n\t<li>\uac19\uc740 \ub4f1\uc0b0\ub85c\ub294 \ucd5c\ub300 \ud55c \ubc88\ub9cc \uc774\uc6a9\ud55c\ub2e4.<\/li>\r\n\t<li>\uac19\uc740 \uc0b0\uc758 \ub4f1\uc0b0\ub85c\ub294 \uc5f0\uc18d\uc73c\ub85c \uc774\uc6a9\ud558\uc9c0 \uc54a\ub294\ub2e4 (\uc989, \ub3d9\ucabd \uc0b0\uacfc \uc11c\ucabd \uc0b0\uc758 \ub4f1\uc0b0\ub85c\ub97c \ubc88\uac08\uc544 \uc774\uc6a9\ud55c\ub2e4).<\/li>\r\n\t<li>\uc5b4\ub5a4 \uc0b0\uc5d0\uc11c \ub2e4\ub978 \uc0b0\uc73c\ub85c \uc774\ub3d9\ud560 \ub54c\uc5d0\ub294 \ubc18\ub4dc\uc2dc \uae38\uc774\uac00 x\uc778 \ub3d9\uc11c&nbsp;\ub2e4\ub9ac\ub97c \uc774\uc6a9\ud558\uba70, \ub2e4\ub978 \uae38\uc740 \uc5c6\ub2e4&nbsp;(\ub3d9\uc11c&nbsp;\ub2e4\ub9ac\ub294 \uc5ec\ub7ec \ubc88 \uc774\uc6a9\ud574\ub3c4 \ub41c\ub2e4).<\/li>\r\n\t<li>\ub3d9\uc11c \ub2e4\ub9ac\ub294 \ub4f1\uc0b0 \uacc4\ud68d\uc758 \ub9e8 \ucc98\uc74c\uc774\ub098 \ub9e8&nbsp;\ub05d\uc5d0 \uc62c \uc218 \uc5c6\uace0, \ub3d9\uc11c \ub2e4\ub9ac\ub294 \uc5f0\uc18d\uc73c\ub85c \uc774\uc6a9\ud560 \uc218 \uc5c6\ub2e4. \ub530\ub77c\uc11c \ub3d9\uc11c \ub2e4\ub9ac\ub97c \uc774\uc6a9\ud560 \uacbd\uc6b0&nbsp;\ubc18\ub4dc\uc2dc \uc804\/\ud6c4\uc5d0 \ub3d9\ucabd \uc0b0 \ud639\uc740 \uc11c\ucabd \uc0b0\uc758 \ub4f1\uc0b0\ub85c\ub97c \uc774\uc6a9\ud574\uc57c \ud55c\ub2e4.<\/li>\r\n<\/ol>\r\n\r\n<p>\uc608\ub97c \ub4e4\uc5b4, \uc704\uc758 \uadf8\ub9bc\uc758 \uacbd\uc6b0 n = m = 2, x = 10, A = [40, 45] \uadf8\ub9ac\uace0 B = [42, 42] \uc774\ub2e4. \uc774 \ub54c, C = 1, D = 100 \uc774\ub77c \ud558\uc790. \uc0c1\uae30\ud55c \ubaa8\ub4e0 \uaddc\uce59\uc744 \ub9cc\uc871\ud558\uba70 \uae38\uc774\uac00 1\uc774\uc0c1 100\uc774\ud558\uc778 \ub4f1\uc0b0 \uacc4\ud68d\uc740 \ucd1d 12\uac00\uc9c0 \uc788\ub2e4:<\/p>\r\n\r\n<ul>\r\n\t<li>\ucd1d \uae38\uc774\uac00 40\uc774\uc0c1 45\uc774\ud558\uc778 \ub4f1\uc0b0 \uacc4\ud68d\uc740 4\uac00\uc9c0 \uc874\uc7ac\ud55c\ub2e4 (\ub124\uac1c\uc758 \ub4f1\uc0b0\ub85c \uc911 \ud558\ub098\ub97c \uc774\uc6a9\ud558\uba74 \ub41c\ub2e4).<\/li>\r\n\t<li>\ucd1d \uae38\uc774\uac00 92\uc774\uc0c1 97\uc774\ud558\uc778&nbsp;\ub4f1\uc0b0 \uacc4\ud68d\uc740 8\uac00\uc9c0 \uc874\uc7ac\ud55c\ub2e4 (\uac01 \uc0b0\uc5d0\uc11c \ub4f1\uc0b0\ub85c \ud558\ub098\uc529\uc744 \ud0dd\ud55c \ud6c4, \ub4f1\uc0b0\ud560 \uc21c\uc11c\ub97c \uc815\ud558\uba74 \ub41c\ub2e4).<\/li>\r\n<\/ul>\r\n\r\n<p>\uc785\ub825\uc73c\ub85c n, m, x, C, D, \uadf8\ub9ac\uace0 A, B\uac00 \uc8fc\uc5b4\uc84c\uc744 \ub54c, Albert\ub97c \ub3c4\uc640 \ucd1d \uba87\uac00\uc9c0 \ubc29\ubc95\uc73c\ub85c \ub4f1\uc0b0 \uacc4\ud68d\uc744 \uc138\uc6b8 \uc218 \uc788\ub294\uc9c0 \uad6c\ud574\ubcf4\uc790.<\/p>\r\n","input":"<p>\uc785\ub825 \uccab \uc904\uc5d0 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\uc758 \uc218 T\uac00 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\uac01 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\ub294 \uc138\uc904\uc5d0 \uac78\uccd0 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\uccab \uc904\uc5d0\ub294 n, m, x, C, D\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\ub458\uc9f8 \uc904\uc5d0\ub294 \ub3d9\ucabd \ud558\uc774\ud0b9 \ucf54\uc2a4 \uae38\uc774\ub97c \ub098\ud0c0\ub0b4\ub294 n\uac1c\uc758 \uc815\uc218\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\uc14b\uc9f8 \uc904\uc5d0\ub294 \uc11c\ucabd \ud558\uc774\ud0b9 \ucf54\uc2a4 \uae38\uc774\ub97c \ub098\ud0c0\ub0b4\ub294 m\uac1c\uc758 \uc815\uc218\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n","output":"<p>\uac01 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\uc758 \uc815\ub2f5\uc744 \uac01 \uc904\uc5d0 \ucd9c\ub825\ud55c\ub2e4. \ub2e8, \uc815\ub2f5\uc774 \ub9e4\uc6b0 \ud074 \uc218 \uc788\uc73c\ubbc0\ub85c&nbsp;10<sup>9<\/sup>+7\ub85c \ub098\ub208 \ub098\uba38\uc9c0\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"","original":"1","html_title":"0","problem_lang_tcode":"Korean","limit":"<ul>\r\n\t<li>1 &le; T &le; 5<\/li>\r\n\t<li>1 &le; n, m &le; 18<\/li>\r\n\t<li>1 &le; x &le; 10<sup>8<\/sup><\/li>\r\n\t<li>\u200b1 \u200b&le; C &le; D &le; 10<sup>9<\/sup><\/li>\r\n\t<li>1 \u200b\u200b&le; \uac01 \ub4f1\uc0b0\ub85c\uc758 \uae38\uc774 &le;&nbsp;10<sup>8<\/sup><\/li>\r\n<\/ul>\r\n","sample_explain_1":"<p>\uc608\uc81c 1:&nbsp;\uc704 \uaddc\uce59\uc744 \ub9cc\uc871\ud558\uba70 \uae38\uc774\uac00 245\uc778 \ub4f1\uc0b0 \uacc4\ud68d\uc740 \ub450 \uac00\uc9c0\uac00 \uc788\ub2e4:<\/p>\r\n\r\n<ul>\r\n\t<li>\ubc29\ubc95 1: (\ub4f1\uc0b0\ub85c A1) - (\ub2e4\ub9ac) - (\ub4f1\uc0b0\ub85c B5) - (\ub2e4\ub9ac) - (\ub4f1\uc0b0\ub85c A3)<\/li>\r\n\t<li>\ubc29\ubc95 2: (\ub4f1\uc0b0\ub85c A3) - (\ub2e4\ub9ac) - (\ub4f1\uc0b0\ub85c B5) - (\ub2e4\ub9ac) - (\ub4f1\uc0b0\ub85c A1)<\/li>\r\n<\/ul>\r\n\r\n<p>\uc608\uc81c 2:&nbsp;\ubaa8\ub4e0 10\uac1c\uc758 \ub4f1\uc0b0\ub85c\ub97c \ud55c \ubc88\uc529 \ub2e4 \uc774\uc6a9\ud558\uba74 (\ub530\ub77c\uc11c \ub2e4\ub9ac\ub97c&nbsp;9\ubc88 \uc9c0\ub098\uba74) \ucd1d \uae38\uc774\uac00 39\uac00 \ub41c\ub2e4.<br \/>\r\n\uc704 \uaddc\uce59\uc744 \ub530\ub974\uba74\uc11c 10\uac1c\uc758 \ub4f1\uc0b0\ub85c\ub97c \ud55c \ubc88\uc529 \uc774\uc6a9\ud558\ub294 \ubc29\ubc95\uc740 \ucd1d&nbsp;28800\uac00\uc9c0\uac00 \uc788\ub2e4.<\/p>\r\n\r\n<p>\uc608\uc81c 3:&nbsp;<\/p>\r\n\r\n<ul>\r\n\t<li>\ucd1d \uae38\uc774\uac00 1\uc778 \ub4f1\uc0b0 \uacc4\ud68d\uc740 10\uac00\uc9c0 \uc874\uc7ac\ud55c\ub2e4 (\uc544\ubb34 \ub4f1\uc0b0\ub85c \ud558\ub098\ub97c \uace0\ub974\uba74 \ub41c\ub2e4).<\/li>\r\n\t<li>\ucd1d \uae38\uc774\uac00 2\uc778 \ub4f1\uc0b0 \uacc4\ud68d\uc740 0\uac00\uc9c0 \uc874\uc7ac\ud55c\ub2e4.<\/li>\r\n\t<li>\ucd1d \uae38\uc774\uac00 3\uc778 \ub4f1\uc0b0 \uacc4\ud68d\uc740 50\uac00\uc9c0 \uc874\uc7ac\ud55c\ub2e4 (\ub3d9\ucabd \uc0b0\uacfc \uc11c\ucabd \uc0b0\uc758 \ub4f1\uc0b0\ub85c \ud558\ub098\uc529\uc744 \uace0\ub974\uba74 \ub41c\ub2e4).<\/li>\r\n<\/ul>\r\n\r\n<p>\ub530\ub77c\uc11c \ub2f5\uc740 60\uc774\ub2e4.<\/p>\r\n","sample_explain_2":"<p>\uc608\uc81c 1: \ubcf8\ubb38\uc5d0\uc11c \ub2e4\ub8e8\uc5c8\ub2e4.<\/p>\r\n\r\n<p>\uc608\uc81c 2-3: \ucd94\uac00 \uc124\uba85 \uc5c6\uc74c.<\/p>\r\n"},{"problem_id":"23021","problem_lang":"1","title":"Hiking","description":"<p>Albert loves hiking.<\/p>\r\n\r\n<p>There are two nearby mountains (Mt. East and Mt. West), and there are hiking trails of various lengths.<\/p>\r\n\r\n<p>Mt. East has n trails (whose lengths are A[1], ..., A[n]). Mt. West has m trails (whose lengths are B[1], ..., B[m]).<\/p>\r\n\r\n<p>Every trail in Mt. East begins and ends at the same place (the entrance of Mt. East), and likewise every trail in Mt. West begins and ends at the same location (the entrance of Mt. West).<\/p>\r\n\r\n<p>The entrances of the two mountains are connected by the East-West bridge of length x. In the image below, the square represents the entrance of Mt. East and&nbsp;the circle the entrance of Mt. West, where the East-West bridge has length x = 10. The two trails of&nbsp;Mt. East has lengths 40 and 45 whereas the two trails of Mt. West has the same length of 42.<\/p>\r\n\r\n<p style=\"text-align: center;\"><img alt=\"\" src=\"https:\/\/upload.acmicpc.net\/042ca582-1c9f-4cb7-a42d-7c4fc550e670\/-\/preview\/\" \/><\/p>\r\n\r\n<p>Albert wants to plan a hiking route whose total length is at least C and at most D, according to the rules below. (A hiking route is to describe which trails are used in what order.)<\/p>\r\n\r\n<ol>\r\n\t<li>The same trail cannot be used more than once.<\/li>\r\n\t<li>Two trails of the same mountain cannot be used back-to-back (hence, each mountain&#39;s trail must be used alternatively).<\/li>\r\n\t<li>When moving from one mountain to the other, the East-West bridge (of length x) must be used -- this is the only way. The bridge can be used multiple times.<\/li>\r\n\t<li>The bridge cannot be used as the first or the last trail, and the bridge cannot be used consecutively. Hence, when the bridge is used, it must be before and after using a trail from either of the mountains.<\/li>\r\n<\/ol>\r\n\r\n<p>In the example above, we have&nbsp; n = m = 2, x = 10, A = [40, 45] and B = [42, 42]. Suppose C = 1 and D = 100. There are 12 hiking routes Albert can use whose net length is between 1 and 100, inclusive:<\/p>\r\n\r\n<ul>\r\n\t<li>4 hiking routes whose length is between 40 and 45, inclusive (Albert can use one of the four trails alone).<\/li>\r\n\t<li>8 hiking routes whose length is between 92 and 97, inclusive (Albert can use one trail from each mountain, and then decide the order in which he&#39;ll use them).<\/li>\r\n<\/ul>\r\n\r\n<p>Given n, m, x, C, D, A, and B, help Albert figure out how many hiking routes he can come up with.&nbsp;<\/p>\r\n","input":"<p>The first line of the input will contain an integer T, the number of test cases.<\/p>\r\n\r\n<p>Each test case will consist of three lines. The first line will contain n, m, x, C, and D, separated by whitespace. The second line will contain n integers (the lengths of the trails in Mt. East), separated by whitespace. The third line will contain m integers (the lengths of the trails in Mt. West), separated by whitespace.<\/p>\r\n","output":"<p>Output the answer in a single line for each test case.<\/p>\r\n\r\n<p>Since the answer can be very large, output the answer modulo 10<sup>9<\/sup>+7.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"English","limit":"<ul>\r\n\t<li>1 &le; T &le; 5<\/li>\r\n\t<li>1 &le; n, m &le; 18<\/li>\r\n\t<li>1 &le; x &le; 10<sup>8<\/sup><\/li>\r\n\t<li>\u200b1 \u200b&le; C &le; D &le; 10<sup>9<\/sup><\/li>\r\n\t<li>1 \u200b\u200b&le; the length of each trail &le;&nbsp;10<sup>8<\/sup><\/li>\r\n<\/ul>\r\n","sample_explain_1":"<p>Case 1: There are two hiking routes of length 245:<\/p>\r\n\r\n<ul>\r\n\t<li>Route 1: (Trail A1) - (Bridge) - (Trail B5) - (Bridge) - (Trail A3)<\/li>\r\n\t<li>Route 2: (Trail A3) - (Bridge) - (Trail B5) - (Bridge) - (Trail A1)<\/li>\r\n<\/ul>\r\n\r\n<p>Case 2: If every trail is used exactly once (and the bridge is crossed 9 times), then the total length is 39.<br \/>\r\nThere are 28,800 such routes that meet the rules.<\/p>\r\n\r\n<p>Case 3:<\/p>\r\n\r\n<ul>\r\n\t<li>There are 10 routes of length 1 (any one trail can be used).<\/li>\r\n\t<li>There are 0 routes of length 2.&nbsp;<\/li>\r\n\t<li>There are 50 routes of length 3 (one trail from each mountain can be chosen).<\/li>\r\n<\/ul>\r\n\r\n<p>Hence, the answer is 60.<\/p>\r\n","sample_explain_2":"<p>Case 1: Discussed in the problem statement.<\/p>\r\n\r\n<p>Case 2-3: No&nbsp;explanation provided.<\/p>\r\n"}]

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