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33493번 - 애벌레와 트리 서브태스크다국어

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문제

$N$개의 정점으로 이루어진 트리가 있다. 트리의 각 정점은 1ドル$번부터 $N$번까지 번호가 매겨져 있고, $i$번째 간선은 $u_i$번 정점과 $v_i$번 정점을 연결한다. 이 트리 위에는 애벌레가 한 마리 살고 있는데, 초기 상태에서 애벌레의 머리는 $h$번 정점에 위치해 있고, 애벌레의 꼬리는 $t$번 정점에 위치해 있다. 애벌레는 머리가 위치한 정점과 꼬리가 위치한 정점, 그리고 그 두 정점 간의 경로에 속한 모든 정점을 차지한다.

현재 애벌레의 머리가 $a$번 정점에, 꼬리가 $b$번 정점에 위치해 있다면, 애벌레는 다음의 조건들을 모두 만족하는 $a'$와 $b'$에 대해 머리와 꼬리를 각각 $a'$번 정점과 $b'$번 정점으로 동시에 이동시킬 수 있다.

  • $a$번 정점과 $a'$번 정점은 인접해 있고, $b$번 정점과 $b'$번 정점은 인접해 있다.
  • $a'$번 정점과 $b'$번 정점 중 정확히 하나는 이동 전 애벌레가 차지하지 않았던 정점이고, 나머지 하나는 이동 전 애벌레가 차지했던 정점이다.

이렇게 이동하더라도 애벌레가 차지하는 정점의 개수는 변하지 않음에 유의하라.

이때 아래와 같은 쿼리 $Q$개에 대해 답해보자.

  • $h'$ $t'$: 머리와 꼬리가 각각 $h$번 정점과 $t$번 정점에 위치한 초기 상태의 애벌레가 0ドル$번 이상의 이동을 통해 머리와 꼬리가 각각 $h'$번 정점과 $t'$번 정점에 위치하게끔 할 수 있는가?

입력

첫 번째 줄에 세 개의 정수 $N,ドル $h,ドル $t$가 공백으로 구분되어 주어진다.

다음 $N-1$개의 줄 중 $i$번째 줄에 두 개의 정수 $u_i,ドル $v_i$가 공백으로 구분되어 주어진다.

다음 줄에 정수 $Q$가 주어진다.

다음 $Q$개의 줄에 쿼리들의 정보가 주어지며, 각 줄에는 두 정수 $h'$와 $t'$가 공백으로 구분되어 주어진다.

출력

$Q$개의 줄에 걸쳐 문제의 정답을 출력한다. $i$번째 줄에는 $i$번째 쿼리의 답이 참이라면 YES를, 거짓이라면 NO를 출력한다.

제한

  • 2ドル\leq N\leq 100000$
  • 1ドル\leq Q\leq 50000$
  • 1ドル\leq u_i,v_i \leq N$
  • $u_i\ne v_i$
  • 1ドル\leq h,t \leq N$
  • $h\ne t$
  • 1ドル\leq h',t' \leq N$
  • $h'$와 $t'$ 사이의 거리와 $h$와 $t$ 사이의 거리는 같음

서브태스크

번호배점제한
15

$N \leq 300$

210

$N \leq 2000$

385

추가 제약 조건 없음

예제 입력 1

5 3 4
1 2
1 3
1 4
4 5
4
1 5
2 4
2 3
4 2

예제 출력 1

YES
YES
NO
NO

힌트

[{"problem_id":"33493","problem_lang":"0","title":"\uc560\ubc8c\ub808\uc640 \ud2b8\ub9ac","description":"<p>$N$\uac1c\uc758 \uc815\uc810\uc73c\ub85c \uc774\ub8e8\uc5b4\uc9c4 \ud2b8\ub9ac\uac00 \uc788\ub2e4. \ud2b8\ub9ac\uc758 \uac01 \uc815\uc810\uc740 $1$\ubc88\ubd80\ud130 $N$\ubc88\uae4c\uc9c0 \ubc88\ud638\uac00 \ub9e4\uaca8\uc838 \uc788\uace0, $i$\ubc88\uc9f8 \uac04\uc120\uc740 $u_i$\ubc88 \uc815\uc810\uacfc $v_i$\ubc88 \uc815\uc810\uc744 \uc5f0\uacb0\ud55c\ub2e4. \uc774 \ud2b8\ub9ac \uc704\uc5d0\ub294 \uc560\ubc8c\ub808\uac00 \ud55c \ub9c8\ub9ac \uc0b4\uace0 \uc788\ub294\ub370, \ucd08\uae30 \uc0c1\ud0dc\uc5d0\uc11c \uc560\ubc8c\ub808\uc758 \uba38\ub9ac\ub294 $h$\ubc88 \uc815\uc810\uc5d0 \uc704\uce58\ud574 \uc788\uace0, \uc560\ubc8c\ub808\uc758 \uaf2c\ub9ac\ub294 $t$\ubc88 \uc815\uc810\uc5d0 \uc704\uce58\ud574 \uc788\ub2e4. \uc560\ubc8c\ub808\ub294 \uba38\ub9ac\uac00 \uc704\uce58\ud55c \uc815\uc810\uacfc \uaf2c\ub9ac\uac00 \uc704\uce58\ud55c \uc815\uc810, \uadf8\ub9ac\uace0 \uadf8 \ub450 \uc815\uc810 \uac04\uc758 \uacbd\ub85c\uc5d0 \uc18d\ud55c \ubaa8\ub4e0 \uc815\uc810\uc744 \ucc28\uc9c0\ud55c\ub2e4.<\/p>\r\n\r\n<p>\ud604\uc7ac \uc560\ubc8c\ub808\uc758 \uba38\ub9ac\uac00 $a$\ubc88 \uc815\uc810\uc5d0, \uaf2c\ub9ac\uac00 $b$\ubc88 \uc815\uc810\uc5d0 \uc704\uce58\ud574 \uc788\ub2e4\uba74, \uc560\ubc8c\ub808\ub294 \ub2e4\uc74c\uc758 \uc870\uac74\ub4e4\uc744 \ubaa8\ub450 \ub9cc\uc871\ud558\ub294 $a&#39;$\uc640 $b&#39;$\uc5d0 \ub300\ud574 \uba38\ub9ac\uc640 \uaf2c\ub9ac\ub97c \uac01\uac01 $a&#39;$\ubc88 \uc815\uc810\uacfc $b&#39;$\ubc88 \uc815\uc810\uc73c\ub85c \ub3d9\uc2dc\uc5d0 \uc774\ub3d9\uc2dc\ud0ac \uc218 \uc788\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>$a$\ubc88 \uc815\uc810\uacfc $a&#39;$\ubc88 \uc815\uc810\uc740 \uc778\uc811\ud574 \uc788\uace0, $b$\ubc88 \uc815\uc810\uacfc $b&#39;$\ubc88 \uc815\uc810\uc740 \uc778\uc811\ud574 \uc788\ub2e4.<\/li>\r\n\t<li>$a&#39;$\ubc88 \uc815\uc810\uacfc $b&#39;$\ubc88 \uc815\uc810 \uc911 \uc815\ud655\ud788 \ud558\ub098\ub294 \uc774\ub3d9 \uc804 \uc560\ubc8c\ub808\uac00 \ucc28\uc9c0\ud558\uc9c0 \uc54a\uc558\ub358 \uc815\uc810\uc774\uace0, \ub098\uba38\uc9c0 \ud558\ub098\ub294 \uc774\ub3d9 \uc804 \uc560\ubc8c\ub808\uac00 \ucc28\uc9c0\ud588\ub358 \uc815\uc810\uc774\ub2e4.<\/li>\r\n<\/ul>\r\n\r\n<p>\uc774\ub807\uac8c \uc774\ub3d9\ud558\ub354\ub77c\ub3c4 \uc560\ubc8c\ub808\uac00 \ucc28\uc9c0\ud558\ub294 \uc815\uc810\uc758 \uac1c\uc218\ub294 \ubcc0\ud558\uc9c0 \uc54a\uc74c\uc5d0 \uc720\uc758\ud558\ub77c.<\/p>\r\n\r\n<p>\uc774\ub54c \uc544\ub798\uc640 \uac19\uc740 \ucffc\ub9ac $Q$\uac1c\uc5d0 \ub300\ud574 \ub2f5\ud574\ubcf4\uc790.<\/p>\r\n\r\n<ul>\r\n\t<li><span style=\"color:#e74c3c;\">$h&#39;$ $t&#39;$<\/span>: \uba38\ub9ac\uc640 \uaf2c\ub9ac\uac00 \uac01\uac01 $h$\ubc88 \uc815\uc810\uacfc $t$\ubc88 \uc815\uc810\uc5d0 \uc704\uce58\ud55c \ucd08\uae30 \uc0c1\ud0dc\uc758 \uc560\ubc8c\ub808\uac00 $0$\ubc88 \uc774\uc0c1\uc758 \uc774\ub3d9\uc744 \ud1b5\ud574 \uba38\ub9ac\uc640 \uaf2c\ub9ac\uac00 \uac01\uac01 $h&#39;$\ubc88 \uc815\uc810\uacfc $t&#39;$\ubc88 \uc815\uc810\uc5d0 \uc704\uce58\ud558\uac8c\ub054 \ud560 \uc218 \uc788\ub294\uac00?<\/li>\r\n<\/ul>\r\n","input":"<p>\uccab \ubc88\uc9f8 \uc904\uc5d0 \uc138 \uac1c\uc758 \uc815\uc218 $N$, $h$, $t$\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\ub2e4\uc74c $N-1$\uac1c\uc758 \uc904 \uc911 $i$\ubc88\uc9f8 \uc904\uc5d0 \ub450 \uac1c\uc758 \uc815\uc218 $u_i$, $v_i$\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\ub2e4\uc74c \uc904\uc5d0 \uc815\uc218 $Q$\uac00 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\ub2e4\uc74c $Q$\uac1c\uc758 \uc904\uc5d0 \ucffc\ub9ac\ub4e4\uc758 \uc815\ubcf4\uac00 \uc8fc\uc5b4\uc9c0\uba70, \uac01 \uc904\uc5d0\ub294 \ub450 \uc815\uc218 $h&#39;$\uc640 $t&#39;$\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n","output":"<p>$Q$\uac1c\uc758 \uc904\uc5d0 \uac78\uccd0 \ubb38\uc81c\uc758 \uc815\ub2f5\uc744 \ucd9c\ub825\ud55c\ub2e4. $i$\ubc88\uc9f8 \uc904\uc5d0\ub294 $i$\ubc88\uc9f8 \ucffc\ub9ac\uc758 \ub2f5\uc774 \ucc38\uc774\ub77c\uba74 <span style=\"color:#e74c3c;\"><code>YES<\/code><\/span>\ub97c, \uac70\uc9d3\uc774\ub77c\uba74 <span style=\"color:#e74c3c;\"><code>NO<\/code><\/span>\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"","original":"1","html_title":"0","problem_lang_tcode":"Korean","limit":"<ul>\r\n\t<li>$2\\leq N\\leq 100000$<\/li>\r\n\t<li>$1\\leq Q\\leq 50000$<\/li>\r\n\t<li>$1\\leq u_i,v_i \\leq N$<\/li>\r\n\t<li>$u_i\\ne v_i$<\/li>\r\n\t<li>$1\\leq h,t \\leq N$<\/li>\r\n\t<li>$h\\ne t$<\/li>\r\n\t<li>$1\\leq h&#39;,t&#39; \\leq N$<\/li>\r\n\t<li>$h&#39;$\uc640 $t&#39;$ \uc0ac\uc774\uc758 \uac70\ub9ac\uc640 $h$\uc640 $t$ \uc0ac\uc774\uc758 \uac70\ub9ac\ub294 \uac19\uc74c<\/li>\r\n<\/ul>\r\n","subtask1":"<p>$N \\leq 300$<\/p>\r\n","subtask2":"<p>$N \\leq 2000$<\/p>\r\n","subtask3":"<p>\ucd94\uac00 \uc81c\uc57d \uc870\uac74 \uc5c6\uc74c<\/p>\r\n"},{"problem_id":"33493","problem_lang":"1","title":"Caterpillar and Tree","description":"<p>There is a tree consisting of $N$ vertices. Each vertex is numbered from $1$ to $N$, and the $i$-th edge connects vertex $u_i$ and vertex $v_i$. A caterpillar lives on this tree. Initially, the head of the caterpillar is located at vertex $h$, and its tail is located at vertex $t$. The caterpillar occupies the head vertex, the tail vertex, and all vertices along the path between them.<\/p>\r\n\r\n<p>If the caterpillar&#39;s head is currently at vertex $a$ and its tail is at vertex $b$, it can simultaneously move its head and tail to vertices $a&#39;$ and $b&#39;$, respectively, provided that all of the following conditions hold:<\/p>\r\n\r\n<ul>\r\n\t<li>Vertex $a&#39;$ is adjacent to vertex $a$, and vertex $b&#39;$ is adjacent to vertex $b$.<\/li>\r\n\t<li>Exactly one of&nbsp;vertex $a&#39;$ and vertex $b&#39;$ was not occupied by the caterpillar before the move, while the other was occupied.<\/li>\r\n<\/ul>\r\n\r\n<p>Note that the number of vertices occupied by the caterpillar remains unchanged after the move.<\/p>\r\n\r\n<p>Now, consider performing $Q$ queries of the following form:<\/p>\r\n\r\n<ul>\r\n\t<li><span style=\"color:#e74c3c;\">$h&#39;$ $t&#39;$<\/span>: Determine whether it is possible for the caterpillar, starting from its initial state with its head at vertex $h$ and its tail at vertex $t$, to reach a state where its head is at vertex $h&#39;$ and its tail is at vertex $t&#39;$ after performing zero or more valid moves.<\/li>\r\n<\/ul>\r\n","input":"<p>The first line contains three&nbsp;space-separated integers&nbsp;$N$, $h$, and $t$.<\/p>\r\n\r\n<p>The $i$-th line of the following $N-1$ lines contains two space-separated integers $u_i$ and $v_i$.<\/p>\r\n\r\n<p>The next line contains an integer $Q$.<\/p>\r\n\r\n<p>The $i$-th line of the following $Q$ lines contains two space-separated integers $h&#39;$ and&nbsp;$t&#39;$.<\/p>\r\n","output":"<p>Print the answer on $Q$ lines. On the $i$-th line of the $Q$ lines, print <span style=\"color:#e74c3c;\"><code>YES<\/code><\/span>&nbsp;if the answer of $i$-th query is true, <span style=\"color:#e74c3c;\"><code>NO<\/code><\/span> if false.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"English","limit":"<ul>\r\n\t<li>$2\\leq N\\leq 100000$<\/li>\r\n\t<li>$1\\leq Q\\leq 50000$<\/li>\r\n\t<li>$1\\leq u_i,v_i \\leq N$<\/li>\r\n\t<li>$u_i\\ne v_i$<\/li>\r\n\t<li>$1\\leq h,t \\leq N$<\/li>\r\n\t<li>$h\\ne t$<\/li>\r\n\t<li>$1\\leq h&#39;,t&#39; \\leq N$<\/li>\r\n\t<li>The distance between $h&#39;$ and&nbsp;$t&#39;$ and the distance between&nbsp;$h$ and&nbsp;$t$ is the same<\/li>\r\n<\/ul>\r\n","subtask1":"<p>$N \\leq 300$<\/p>\r\n","subtask2":"<p>$N \\leq 2000$<\/p>\r\n","subtask3":"<p>No additional constraints<\/p>\r\n"}]

출처

School > 한국과학영재학교 > 2025 KSA Automata Winter Contest J번

채점 및 기타 정보

  • 예제는 채점하지 않는다.
(追記) (追記ここまで)

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