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문제

경기과학고의 뒤뜰에는 일렬로 된 n개의 나무로 이루어진 숲이 있다. 그 중 첫 번째 나무 위에는 마지막 나무의 위로 올라가고 싶어하는 작은 새가 한 마리 있다. 그 새는 몸집이 매우 작기 때문에 한 번의 비행으로 날아갈 수 있는 거리에 한계가 있다. 만약 새가 i번째 나무 위에 있다면, 이 새는 한 번의 비행으로 i+1, i+2, …, i+k번째 나무 중 하나로 갈 수 있으며 그보다 멀리 떨어진 나무로는 가지 못한다.

또한, 작은 새에게 지금 있는 나무보다 높은 나무로 올라가는 일은 낮은 나무로 내려가는 일보다 더 힘든 일이다. 작은 새는 자기가 현재 위치한 나무보다 같거나 높은 높이의 나무로 날아가면 피로감을 느낀다고 한다.

작은 새의 목표는 자신이 피로감을 느끼는 횟수를 최소화하면서 마지막 나무에 도달하는 것이다. 또한, 이 작은 새에게는 똑같이 최소한의 피로로 마지막 나무로 가고 싶어 하는 친구 새들이 있으며 이들의 k값은 서로 다를 수 있다. 작은 새와 친구 새들이 그들의 목표를 달성할 수 있도록 도와주자.

입력

첫 번째 줄에는 나무의 수를 나타내는 정수 n (2 ≤ n ≤ 1,000,000)이 주어진다.

다음 줄에는 n개의 정수 d1, d2, …, d(1 ≤ di ≤ 109) 가 주어진다. di는 i번째 나무의 높이를 의미한다.

세 번째 줄에는 마지막 나무로 날아가고 싶어하는 새의 수 q (1 ≤ q ≤ 25)가 주어진다.

다음 q개 줄 중 i번째 줄에는 i번째 새가 한 번의 비행으로 날아갈 수 있는 거리인 ki (1 ≤ ki ≤ n-1)가 주어진다.

출력

당신의 프로그램은 q줄에 걸쳐 답을 출력해야 한다. 출력의 i번째 줄에는 i번째 새가 마지막 나무에 도달할 때까지 피로감을 느끼는 횟수의 최솟값을 출력해야 한다.

예제 입력 1

9
4 6 3 6 3 7 2 6 5
2
2
5

예제 출력 1

2
1

힌트

예제의 첫 번째 새는 1, 3, 5, 7, 8, 9번 나무를 거쳐 간다. 이 새는 3번째 나무에서 5번째 나무로 갈 때와 7번째 나무에서 8번째 나무로 갈 때, 총 두 번 피로감을 느낀다.

[{"problem_id":"10129","problem_lang":"0","title":"\uc791\uc740 \uc0c8","description":"<p>\uacbd\uae30\uacfc\ud559\uace0\uc758 \ub4a4\ub730\uc5d0\ub294 \uc77c\ub82c\ub85c \ub41c n\uac1c\uc758 \ub098\ubb34\ub85c \uc774\ub8e8\uc5b4\uc9c4 \uc232\uc774 \uc788\ub2e4. \uadf8 \uc911 \uccab \ubc88\uc9f8 \ub098\ubb34 \uc704\uc5d0\ub294 \ub9c8\uc9c0\ub9c9 \ub098\ubb34\uc758 \uc704\ub85c \uc62c\ub77c\uac00\uace0 \uc2f6\uc5b4\ud558\ub294 \uc791\uc740 \uc0c8\uac00 \ud55c \ub9c8\ub9ac \uc788\ub2e4. \uadf8 \uc0c8\ub294 \ubab8\uc9d1\uc774 \ub9e4\uc6b0 \uc791\uae30 \ub54c\ubb38\uc5d0 \ud55c \ubc88\uc758 \ube44\ud589\uc73c\ub85c \ub0a0\uc544\uac08 \uc218 \uc788\ub294 \uac70\ub9ac\uc5d0 \ud55c\uacc4\uac00 \uc788\ub2e4. \ub9cc\uc57d \uc0c8\uac00 i\ubc88\uc9f8 \ub098\ubb34 \uc704\uc5d0 \uc788\ub2e4\uba74, \uc774 \uc0c8\ub294 \ud55c \ubc88\uc758 \ube44\ud589\uc73c\ub85c i+1, i+2, &hellip;, i+k\ubc88\uc9f8 \ub098\ubb34 \uc911 \ud558\ub098\ub85c \uac08 \uc218 \uc788\uc73c\uba70 \uadf8\ubcf4\ub2e4 \uba40\ub9ac \ub5a8\uc5b4\uc9c4 \ub098\ubb34\ub85c\ub294 \uac00\uc9c0 \ubabb\ud55c\ub2e4.<\/p>\r\n\r\n<p>\ub610\ud55c, \uc791\uc740 \uc0c8\uc5d0\uac8c \uc9c0\uae08 \uc788\ub294 \ub098\ubb34\ubcf4\ub2e4 \ub192\uc740 \ub098\ubb34\ub85c \uc62c\ub77c\uac00\ub294 \uc77c\uc740 \ub0ae\uc740 \ub098\ubb34\ub85c \ub0b4\ub824\uac00\ub294 \uc77c\ubcf4\ub2e4 \ub354 \ud798\ub4e0 \uc77c\uc774\ub2e4. \uc791\uc740 \uc0c8\ub294 \uc790\uae30\uac00 \ud604\uc7ac \uc704\uce58\ud55c \ub098\ubb34\ubcf4\ub2e4 <strong>\uac19\uac70\ub098 \ub192\uc740 <\/strong>\ub192\uc774\uc758 \ub098\ubb34\ub85c \ub0a0\uc544\uac00\uba74 \ud53c\ub85c\uac10\uc744 \ub290\ub080\ub2e4\uace0 \ud55c\ub2e4.<\/p>\r\n\r\n<p>\uc791\uc740 \uc0c8\uc758 \ubaa9\ud45c\ub294 \uc790\uc2e0\uc774 <strong>\ud53c\ub85c\uac10\uc744 \ub290\ub07c\ub294 \ud69f\uc218<\/strong>\ub97c \ucd5c\uc18c\ud654\ud558\uba74\uc11c \ub9c8\uc9c0\ub9c9 \ub098\ubb34\uc5d0 \ub3c4\ub2ec\ud558\ub294 \uac83\uc774\ub2e4. \ub610\ud55c, \uc774 \uc791\uc740 \uc0c8\uc5d0\uac8c\ub294 \ub611\uac19\uc774 \ucd5c\uc18c\ud55c\uc758 \ud53c\ub85c\ub85c \ub9c8\uc9c0\ub9c9 \ub098\ubb34\ub85c \uac00\uace0 \uc2f6\uc5b4 \ud558\ub294 \uce5c\uad6c \uc0c8\ub4e4\uc774 \uc788\uc73c\uba70 \uc774\ub4e4\uc758 k\uac12\uc740 \uc11c\ub85c \ub2e4\ub97c \uc218 \uc788\ub2e4. \uc791\uc740 \uc0c8\uc640 \uce5c\uad6c \uc0c8\ub4e4\uc774 \uadf8\ub4e4\uc758 \ubaa9\ud45c\ub97c \ub2ec\uc131\ud560 \uc218 \uc788\ub3c4\ub85d \ub3c4\uc640\uc8fc\uc790.<\/p>\r\n","input":"<p>\uccab \ubc88\uc9f8 \uc904\uc5d0\ub294 \ub098\ubb34\uc758 \uc218\ub97c \ub098\ud0c0\ub0b4\ub294 \uc815\uc218 n (2 &le; n &le; 1,000,000)\uc774 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\ub2e4\uc74c \uc904\uc5d0\ub294 n\uac1c\uc758 \uc815\uc218 d<sub>1<\/sub>, d<sub>2<\/sub>, &hellip;, d<sub>n&nbsp;<\/sub>(1 &le; d<sub>i<\/sub> &le; 10<sup>9<\/sup>) \uac00 \uc8fc\uc5b4\uc9c4\ub2e4. d<sub>i<\/sub>\ub294 i\ubc88\uc9f8 \ub098\ubb34\uc758 \ub192\uc774\ub97c \uc758\ubbf8\ud55c\ub2e4.<\/p>\r\n\r\n<p>\uc138 \ubc88\uc9f8 \uc904\uc5d0\ub294 \ub9c8\uc9c0\ub9c9 \ub098\ubb34\ub85c \ub0a0\uc544\uac00\uace0 \uc2f6\uc5b4\ud558\ub294 \uc0c8\uc758 \uc218 q (1 &le; q &le; 25)\uac00 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\ub2e4\uc74c q\uac1c \uc904 \uc911 i\ubc88\uc9f8 \uc904\uc5d0\ub294 i\ubc88\uc9f8 \uc0c8\uac00 \ud55c \ubc88\uc758 \ube44\ud589\uc73c\ub85c \ub0a0\uc544\uac08 \uc218 \uc788\ub294 \uac70\ub9ac\uc778 k<sub>i<\/sub> (1 &le; k<sub>i<\/sub> &le; n-1)\uac00 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n","output":"<p>\ub2f9\uc2e0\uc758 \ud504\ub85c\uadf8\ub7a8\uc740 q\uc904\uc5d0 \uac78\uccd0 \ub2f5\uc744 \ucd9c\ub825\ud574\uc57c \ud55c\ub2e4. \ucd9c\ub825\uc758 i\ubc88\uc9f8 \uc904\uc5d0\ub294 i\ubc88\uc9f8 \uc0c8\uac00 \ub9c8\uc9c0\ub9c9 \ub098\ubb34\uc5d0 \ub3c4\ub2ec\ud560 \ub54c\uae4c\uc9c0 \ud53c\ub85c\uac10\uc744 \ub290\ub07c\ub294 \ud69f\uc218\uc758 \ucd5c\uc19f\uac12\uc744 \ucd9c\ub825\ud574\uc57c \ud55c\ub2e4.<\/p>\r\n","hint":"<p>\uc608\uc81c\uc758 \uccab \ubc88\uc9f8 \uc0c8\ub294 1, 3, 5, 7, 8, 9\ubc88 \ub098\ubb34\ub97c \uac70\uccd0 \uac04\ub2e4. \uc774 \uc0c8\ub294 3\ubc88\uc9f8 \ub098\ubb34\uc5d0\uc11c 5\ubc88\uc9f8 \ub098\ubb34\ub85c \uac08 \ub54c\uc640 7\ubc88\uc9f8 \ub098\ubb34\uc5d0\uc11c 8\ubc88\uc9f8 \ub098\ubb34\ub85c \uac08 \ub54c, \ucd1d \ub450 \ubc88 \ud53c\ub85c\uac10\uc744 \ub290\ub080\ub2e4.<\/p>\r\n","original":"0","html_title":"0","problem_lang_tcode":"Korean"},{"problem_id":"10129","problem_lang":"1","title":"Little Bird","description":"<p>In the Byteotian Line Forest there are n trees in a row. On top of the first one, there is a little bird who would like to fly over to the top of the last tree. Being in fact very little, the bird might lack the strength to fly there without any stop. If the bird is sitting on top of the tree no. i, then in a single flight leg it can fly to any of the trees no. i+1,i+2,&hellip;,i+k, and then has to rest afterward.<\/p>\r\n\r\n<p>Moreover, flying up is far harder to flying down. A flight leg is tiresome if it ends in a tree at least as high as the one where is started. Otherwise the flight leg is not tiresome.<\/p>\r\n\r\n<p>The goal is to select the trees on which the little bird will land so that the overall flight is least tiresome, i.e., it has the minimum number of tiresome legs. We note that birds are social creatures, and our bird has a few bird-friends who would also like to get from the first tree to the last one. The stamina of all the birds varies, so the bird&#39;s friends may have different values of the parameter k. Help all the birds, little and big!<\/p>\r\n","input":"<p>There is a single integer n(2 &le; n &le; 1,000,000) in the first line of the standard input: the number of trees in the Byteotian Line Forest. The second line of input holds n integers d<sub>1<\/sub>,d<sub>2<\/sub>,&hellip;,d<sub>n<\/sub>(1 &le; d<sub>i<\/sub> &le; 10<sup>9<\/sup>) separated by single spaces: d<sub>i<\/sub> is the height of the i-th tree.<\/p>\r\n\r\n<p>The third line of the input holds a single integer q(1 &le; q &le; 25): the number of birds whose flights need to be planned. The following q lines describe these birds: in the i-th of these lines, there is an integer k<sub>i<\/sub>(1 &le; k<sub>i<\/sub> &le; n-1) specifying the -th bird&#39;s stamina. In other words, the maximum number of trees that the i-th bird can pass before it has to rest is k<sub>i<\/sub>-1.<\/p>\r\n\r\n<p>In test worth at least l of total score, the condition n &le; 100,000 holds. In a subset of those worth 1 &le; y<sub>i<\/sub> &le; k of total score, it even holds that n &le; 1,000.<\/p>\r\n","output":"<p>Your program should print exactly q lines to the standard output. In the i-th line, it should specify the minimum number of tiresome flight legs of the i-th bird.<\/p>\r\n\r\n<p>&nbsp;<\/p>\r\n","hint":"<p>The first bird may stop at the trees no. 1, 3, 5, 7, 8, 9. Its tiresome flight legs will be the one from the 3-rd tree to the 5-th one and from the 7-th to the 8-th.<\/p>\r\n\r\n<p>&mdash;&mdash;&mdash;&mdash;&mdash;&mdash;&mdash;&mdash;&mdash;<br \/>\r\nSample grading tests:<\/p>\r\n\r\n<ul>\r\n\t<li>1ocen: n=11, q=1, k<sub>1<\/sub>=5, all trees of same height, the answer is 2(a stopover at the 6-th tree suffices);<\/li>\r\n\t<li>2ocen: n=100, q=2, k<sub>1<\/sub>=5, k<sub>2<\/sub>=6, tree heights alternate between 1 and 2 - it is optimal for both birds to stop after every 5 trees, for 11 tiresome legs for each bird;<\/li>\r\n\t<li>3ocen: n=100, q=1, k<sub>1<\/sub>=10, the sequence of heights is: 100,99,&hellip;,1, the answer is 0;<\/li>\r\n\t<li>4ocen: n=1,000,000, q=25, k<sub>i<\/sub>=i, d<sub>1000<\/sub>=d<sub>2000<\/sub>=d<sub>3000<\/sub>=&hellip;=d<sub>1000000<\/sub>=2, the remaining ones satisfy d<sub>i<\/sub>=1.<\/li>\r\n<\/ul>\r\n","original":"1","html_title":"0","problem_lang_tcode":"English"}]

출처

Olympiad > Polish Olympiad in Informatics > POI 2013/2014 > Stage 2 3번

  • 데이터를 추가한 사람: doju
  • 문제를 번역한 사람: khsoo01