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문제

미힐 더 라위터르는 네델란드의 역사에서 가장 유명한 제독이다. 그는 17세기에 벌어진 영국-네델란드 전쟁에서 전공을 세웠다.

라위터르가 살던 시절에 그래프 이론이 연구되기 시작했고, 제독은 이론을 해전 계획에 자주 이용했다. 바다 위의 중간 지점은 정점으로 나타낼 수 있고, 각 중간 지점에서 이동할 수 있는 뱃길은 방향성이 있는 간선으로 나타나 있다. 두 중간 지점 W1와 W2사이에 뱃길 W1 → W2는 최대 한 개 있을 수 있다. 각 간선의 가중치는 그 뱃길을 안전하게 이동하기 위해 발사해야 하는 포탄의 수이다. 

라위터르의 가장 유명한 전술은 "De Ruyter Manoeuvre"이다. 이 전술은 한 중간 지점에서 두 전함이 서로 다른 방향으로 출발을 한다. 그 다음 적함과 전투를 하면서 이동한 다음 목적지에서 다시 만나는 전술이다. 이 전술에서 두 전함은 항상 겹치지 않는 뱃길을 택해야 하며, 출발과 목적지를 제외하고 같은 중간 지점이나 같은 뱃길을 지나면 안된다.

라위터르는 돈을 낭비하는 것을 좋아하지 않는다. 따라서, 포탄을 가장 적게 발사하는 뱃길을 택하려고 한다.

입력

입력은 여러 개의 테스트 케이스로 이루어져 있다. 입력의 끝은 EOF로 확인할 수 있다.

테스트 케이스의 첫째 줄에는 중간 지점의 수 v와 뱃길의 수 e가 주어진다. (3 ≤ v ≤ 1000, 3 ≤ e ≤ 10000) 다음 e개 줄에는 뱃길의 정보 ai, bi, ci가 주어진다. (1 ≤ ai, bi ≤ v, ai ≠ bi, 1 ≤ ci ≤ 100) ai는 뱃길의 시작 지점, bi는 도착 지점, ci는 그 뱃길로 이동할 때 발사해야 하는 포탄의 수이다.

전술의 시작 지점은 1이고, 목적지는 v이다. 항상 1과 v사이에 겹치지 않는 경로가 적어도 두 개 있다.

출력

각 테스트 케이스에 대해서, 두 전함이 전술을 따르면서 발사해야 하는 포탄의 최소 개수를 출력한다.

예제 입력 1

6 11
1 2 23
1 3 12
1 4 99
2 5 17
2 6 73
3 5 3
3 6 21
4 6 8
5 2 33
5 4 5
6 5 20
3 3
1 3 1
1 2 5
2 3 5

예제 출력 1

86
11

힌트

두 함선(빨강, 파랑)은 1에서 시작해서 6에서 만난다. 빨간 함선은 1 → 3 → 6 (총 33개 포탄)으로 이동하고, 파란 함선은 1 → 2 → 5 → 4 → 6 (총 53개 포탄)으로 이동한다. 두 경로에서 출발과 도착을 제외하면 중복되는 정점과 간선이 없다.

[{"problem_id":"3640","problem_lang":"0","title":"\uc81c\ub3c5","description":"<p>\ubbf8\ud790 \ub354 \ub77c\uc704\ud130\ub974\ub294 \ub124\ub378\ub780\ub4dc\uc758 \uc5ed\uc0ac\uc5d0\uc11c \uac00\uc7a5 \uc720\uba85\ud55c \uc81c\ub3c5\uc774\ub2e4. \uadf8\ub294 17\uc138\uae30\uc5d0 \ubc8c\uc5b4\uc9c4 \uc601\uad6d-\ub124\ub378\ub780\ub4dc \uc804\uc7c1\uc5d0\uc11c \uc804\uacf5\uc744 \uc138\uc6e0\ub2e4.<\/p>\r\n\r\n<p>\ub77c\uc704\ud130\ub974\uac00 \uc0b4\ub358 \uc2dc\uc808\uc5d0 \uadf8\ub798\ud504 \uc774\ub860\uc774 \uc5f0\uad6c\ub418\uae30 \uc2dc\uc791\ud588\uace0, \uc81c\ub3c5\uc740 \uc774\ub860\uc744&nbsp;\ud574\uc804 \uacc4\ud68d\uc5d0 \uc790\uc8fc \uc774\uc6a9\ud588\ub2e4. \ubc14\ub2e4 \uc704\uc758 \uc911\uac04 \uc9c0\uc810\uc740 \uc815\uc810\uc73c\ub85c \ub098\ud0c0\ub0bc \uc218 \uc788\uace0, \uac01 \uc911\uac04 \uc9c0\uc810\uc5d0\uc11c \uc774\ub3d9\ud560 \uc218 \uc788\ub294 \ubc43\uae38\uc740&nbsp;\ubc29\ud5a5\uc131\uc774 \uc788\ub294 \uac04\uc120\uc73c\ub85c \ub098\ud0c0\ub098 \uc788\ub2e4. \ub450 \uc911\uac04 \uc9c0\uc810 W1\uc640 W2\uc0ac\uc774\uc5d0 \ubc43\uae38&nbsp;W1 &rarr; W2\ub294 \ucd5c\ub300 \ud55c \uac1c \uc788\uc744 \uc218 \uc788\ub2e4.&nbsp;\uac01 \uac04\uc120\uc758 \uac00\uc911\uce58\ub294 \uadf8 \ubc43\uae38\uc744 \uc548\uc804\ud558\uac8c \uc774\ub3d9\ud558\uae30 \uc704\ud574 \ubc1c\uc0ac\ud574\uc57c \ud558\ub294 \ud3ec\ud0c4\uc758 \uc218\uc774\ub2e4.&nbsp;<\/p>\r\n\r\n<p>\ub77c\uc704\ud130\ub974\uc758 \uac00\uc7a5 \uc720\uba85\ud55c \uc804\uc220\uc740 &quot;De Ruyter Manoeuvre&quot;\uc774\ub2e4. \uc774 \uc804\uc220\uc740 \ud55c \uc911\uac04 \uc9c0\uc810\uc5d0\uc11c \ub450 \uc804\ud568\uc774 \uc11c\ub85c \ub2e4\ub978 \ubc29\ud5a5\uc73c\ub85c \ucd9c\ubc1c\uc744 \ud55c\ub2e4. \uadf8 \ub2e4\uc74c \uc801\ud568\uacfc \uc804\ud22c\ub97c \ud558\uba74\uc11c \uc774\ub3d9\ud55c \ub2e4\uc74c \ubaa9\uc801\uc9c0\uc5d0\uc11c \ub2e4\uc2dc \ub9cc\ub098\ub294 \uc804\uc220\uc774\ub2e4. \uc774 \uc804\uc220\uc5d0\uc11c \ub450 \uc804\ud568\uc740 \ud56d\uc0c1 \uacb9\uce58\uc9c0 \uc54a\ub294 \ubc43\uae38\uc744&nbsp;\ud0dd\ud574\uc57c \ud558\uba70, \ucd9c\ubc1c\uacfc \ubaa9\uc801\uc9c0\ub97c \uc81c\uc678\ud558\uace0 \uac19\uc740 \uc911\uac04 \uc9c0\uc810\uc774\ub098 \uac19\uc740 \ubc43\uae38\uc744&nbsp;\uc9c0\ub098\uba74 \uc548\ub41c\ub2e4.<\/p>\r\n\r\n<p>\ub77c\uc704\ud130\ub974\ub294 \ub3c8\uc744 \ub0ad\ube44\ud558\ub294 \uac83\uc744 \uc88b\uc544\ud558\uc9c0 \uc54a\ub294\ub2e4. \ub530\ub77c\uc11c, \ud3ec\ud0c4\uc744 \uac00\uc7a5 \uc801\uac8c \ubc1c\uc0ac\ud558\ub294 \ubc43\uae38\uc744&nbsp;\ud0dd\ud558\ub824\uace0 \ud55c\ub2e4.<\/p>\r\n","input":"<p>\uc785\ub825\uc740 \uc5ec\ub7ec \uac1c\uc758 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\ub85c \uc774\ub8e8\uc5b4\uc838 \uc788\ub2e4. \uc785\ub825\uc758 \ub05d\uc740 EOF\ub85c \ud655\uc778\ud560 \uc218 \uc788\ub2e4.<\/p>\r\n\r\n<p>\ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\uc758 \uccab\uc9f8 \uc904\uc5d0\ub294 \uc911\uac04 \uc9c0\uc810\uc758 \uc218 v\uc640 \ubc43\uae38\uc758 \uc218 e\uac00 \uc8fc\uc5b4\uc9c4\ub2e4. (3 &le; v &le; 1000, 3 &le; e &le; 10000)&nbsp;\ub2e4\uc74c e\uac1c \uc904\uc5d0\ub294 \ubc43\uae38\uc758 \uc815\ubcf4 a<sub>i<\/sub>, b<sub>i<\/sub>, c<sub>i<\/sub>\uac00 \uc8fc\uc5b4\uc9c4\ub2e4. (1 &le; a<sub>i<\/sub>, b<sub>i<\/sub> &le; v, a<sub>i<\/sub> &ne; b<sub>i<\/sub>, 1 &le; c<sub>i<\/sub> &le; 100) a<sub>i<\/sub>\ub294 \ubc43\uae38\uc758 \uc2dc\uc791 \uc9c0\uc810, b<sub>i<\/sub>\ub294 \ub3c4\ucc29 \uc9c0\uc810, c<sub>i<\/sub>\ub294 \uadf8 \ubc43\uae38\ub85c \uc774\ub3d9\ud560 \ub54c \ubc1c\uc0ac\ud574\uc57c \ud558\ub294 \ud3ec\ud0c4\uc758 \uc218\uc774\ub2e4.<\/p>\r\n\r\n<p>\uc804\uc220\uc758 \uc2dc\uc791 \uc9c0\uc810\uc740 1\uc774\uace0, \ubaa9\uc801\uc9c0\ub294 v\uc774\ub2e4. \ud56d\uc0c1 1\uacfc v\uc0ac\uc774\uc5d0 \uacb9\uce58\uc9c0 \uc54a\ub294 \uacbd\ub85c\uac00 \uc801\uc5b4\ub3c4 \ub450 \uac1c \uc788\ub2e4.<\/p>\r\n","output":"<p>\uac01 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\uc5d0 \ub300\ud574\uc11c, \ub450 \uc804\ud568\uc774 \uc804\uc220\uc744 \ub530\ub974\uba74\uc11c \ubc1c\uc0ac\ud574\uc57c \ud558\ub294 \ud3ec\ud0c4\uc758 \ucd5c\uc18c \uac1c\uc218\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"<p><img alt=\"\" src=\"\/upload\/images\/admiral.png\" style=\"height:284px; opacity:0.9; width:413px\" \/><\/p>\r\n\r\n<p>\ub450 \ud568\uc120(\ube68\uac15, \ud30c\ub791)\uc740 1\uc5d0\uc11c \uc2dc\uc791\ud574\uc11c 6\uc5d0\uc11c \ub9cc\ub09c\ub2e4. \ube68\uac04 \ud568\uc120\uc740 1 &rarr;&nbsp;3&nbsp;&rarr;&nbsp;6 (\ucd1d 33\uac1c \ud3ec\ud0c4)\uc73c\ub85c \uc774\ub3d9\ud558\uace0, \ud30c\ub780 \ud568\uc120\uc740 1&nbsp;&rarr;&nbsp;2&nbsp;&rarr;&nbsp;5&nbsp;&rarr;&nbsp;4&nbsp;&rarr;&nbsp;6 (\ucd1d 53\uac1c \ud3ec\ud0c4)\uc73c\ub85c \uc774\ub3d9\ud55c\ub2e4. \ub450 \uacbd\ub85c\uc5d0\uc11c \ucd9c\ubc1c\uacfc \ub3c4\ucc29\uc744 \uc81c\uc678\ud558\uba74 \uc911\ubcf5\ub418\ub294 \uc815\uc810\uacfc \uac04\uc120\uc774 \uc5c6\ub2e4.<\/p>\r\n","original":"0","problem_lang_code":"\ud55c\uad6d\uc5b4"},{"problem_id":"3640","problem_lang":"1","title":"Admiral","description":"<p>Michiel Adriaenszoon de Ruyter is the most famous admiral in Dutch history and is well known for his role in the Anglo-Dutch Wars of the 17th century. De Ruyter personally commanded a \ufb02agship and issued commands to allied warships during naval battles.<\/p>\r\n\r\n<p>In De Ruyter&rsquo;s time, graph theory had just been invented and the admiral used it to his great advantage in planning his naval battles. Waypoints at sea are represented by vertices, and possible passages from one waypoint to another are represented as directed edges. Given any two waypoints W1 and W2, there is at most one passage W1 &rarr; W2. Each directed edge is marked with the number of cannonballs that need to be \ufb01red in order to safely move a ship along that edge, sinking the enemy ships encountered along the way.<\/p>\r\n\r\n<p>One of De Ruyter&rsquo;s most successful tactics was the De Ruyter Manoeuvre. Here, two warships start at the same waypoint, and split up and \ufb01ght their way through the enemy \ufb02eet, joining up again at a destination waypoint. The manoeuvre prescribes that the two warships take disjunct routes, meaning that they must not visit the same waypoint (other than the start and end-points), or use the same passage during the battle.<\/p>\r\n\r\n<p>Being Dutch, Admiral De Ruyter did not like to waste money; in 17th century naval warfare, this meant \ufb01ring as few expensive cannonballs as possible.<\/p>\r\n","input":"<p>For each test case, the input consists of:<\/p>\r\n\r\n<ul>\r\n\t<li>A line containing two integers v (3 &le; v &le; 1000) and e (3 &le; e &le; 10000), the number of waypoints and passages, respectively.<\/li>\r\n\t<li>Then, e lines follow: for each passage, a line containing three integers:\r\n\t<ol>\r\n\t\t<li>a<sub>i<\/sub> (1 &le; a<sub>i<\/sub>&nbsp;&le; v), the starting-point of a passage, which is represented by a waypoint;<\/li>\r\n\t\t<li>b<sub>i<\/sub> (1 &le; b<sub>i<\/sub>&nbsp;&le; v) and (a<sub>i<\/sub> &ne; b<sub>i<\/sub>), the end-point of a passage, which is represented by a waypoint. All passages are directed passages;<\/li>\r\n\t\t<li>c<sub>i<\/sub> (1 &le; c<sub>i<\/sub>&nbsp;&le; 100), the number of cannonballs that are \ufb01red when travelling along this passage.<\/li>\r\n\t<\/ol>\r\n\t<\/li>\r\n<\/ul>\r\n\r\n<p>The starting waypoint is 1 and the destination waypoint is v. There are always at least two disjunct routes from waypoint 1 to waypoint v.<\/p>\r\n","output":"<p>For each test case, the output consists of a single positive integer: the smallest possible sum of cannonballs \ufb01red by both ships when reaching the destination waypoint.<\/p>\r\n","hint":"<p><img alt=\"\" src=\"\/upload\/images\/admiral.png\" style=\"height:284px; opacity:0.9; width:413px\" \/><\/p>\r\n\r\n<p>Figure 1: A particular instance of De Ruyter&rsquo;s tactic, visualised as a graph. Two ships (&lsquo;red&rsquo; and &lsquo;blue&rsquo;) move from a shared starting point (1) to a shared endpoint (6). The red ship&rsquo;s route is 1 &rarr; 3 &rarr; 6 (\ufb01ring 33 canonballs along the way); the blue ship&rsquo;s route is 1 &rarr; 2 &rarr; 5 &rarr; 4 &rarr; 6 (\ufb01ring 53 canonballs along the way). In total, 86 canonballs are \ufb01red during the manoeuvre. Except for the start- and end-point, no vertices or edges are visited by both ships.<\/p>\r\n","original":"1","problem_lang_code":"\uc601\uc5b4"}]

출처

ACM-ICPC > Regionals > Europe > Northwestern European Regional Contest > NWERC 2012 A번