시간 제한메모리 제한제출정답맞힌 사람정답 비율
2 초 (추가 시간 없음) 32 MB (추가 메모리 없음)103341733.333%

문제

메모리 제한에 유의하세요.

어린 시절 제연이는 $1$부터 $N$까지의 번호가 쓰여 있는 $N$개의 구슬을 가지고 있었다. 각 구슬은 붉은색 또는 푸른색을 띠고 있었으며, 제연이는 구슬들을 $N$개의 서로 다른 주머니에 하나씩 넣어 보관했다.

제연이는 구슬들을 소중히 여겼다. 그래서 매일매일 구슬들을 가지고 한 행동들을 모두 일기장에 순서대로 기록했다. 제연이가 일기장에 기록한 일은 다음 세 종류 중 하나이다.

  • 1 i j : $i$번 구슬이 들어 있는 주머니와 $j$번 구슬이 들어 있는 주머니를 합친다. ($1\leq i, j \leq N$)
  • 2 i : $i$번 구슬을 갖고 놀다가 잃어버린다. ($1\leq i \leq N$) 슬프게도 잃어버린 구슬은 영영 다시 찾지 못했다.
  • 3 i l h : $i$번 구슬이 들어 있는 주머니를 관찰한다. 그 주머니에는 붉은색 구슬이 $l$개 이상 $h$개 이하 들어 있었다. ($1 \leq i \leq N, 0 \leq l \leq h \leq N$)

10년이 지난 뒤, 제연이는 $M$개의 기록이 적혀 있는 일기장을 발견했다. 그 시절의 순수함을 잃어버린 제연이는 일기장을 보고 각 구슬의 색깔을 복원하기로 했다. 혼자서 색깔을 복원할 생각을 하니 눈앞이 샛노래진 제연이를 도와주자.

단, 구슬은 항상 주머니에 넣어서 보관했으며, 일기장에 기록되지 않은 구슬의 이동이나 변화는 없었다고 가정한다.

입력

첫째 줄에 정수 $N$과 $M$($2 \leq N \leq 2\ 000,\, 1 \leq M \leq 4\ 000$)이 주어진다.

둘째 줄부터 $M$개의 줄에 일기장의 기록이 위에서 설명한 형식으로 주어진다. 이전에 잃어버리지 않은 구슬만 기록에 등장하며, 1번 종류의 기록에서 $i$번 구슬과 $j$번 구슬은 다른 주머니에 속해 있는 상태였음이 보장된다.

출력

$M$개의 기록을 모두 만족하는 $N$개 구슬의 색깔 조합이 존재한다면 YES를, 존재하지 않는다면 NO를 출력한다.

그러한 색깔 조합이 존재한다면, 다음 줄에 길이 $N$의 문자열을 출력한다. 문자열의 $i$번째 문자는 $i$번 구슬이 붉은색이면 R, 푸른색이면 B이다. 답이 여러 가지라면 아무것이나 출력해도 된다.

예제 입력 1

5 9
1 2 4
1 1 5
3 4 1 2
3 5 0 1
1 4 1
3 4 2 5
2 1
3 4 0 1
3 3 1 1

예제 출력 1

YES
RBRRB

예제 입력 2

3 4
1 1 2
3 2 1 2
1 2 3
3 3 0 0

예제 출력 2

NO
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($1\\leq i, j \\leq N$)<\/li>\r\n\t<li><code>2 i<\/code> : $i$\ubc88 \uad6c\uc2ac\uc744 \uac16\uace0 \ub180\ub2e4\uac00 \uc783\uc5b4\ubc84\ub9b0\ub2e4. ($1\\leq i \\leq N$) \uc2ac\ud504\uac8c\ub3c4 \uc783\uc5b4\ubc84\ub9b0 \uad6c\uc2ac\uc740 \uc601\uc601 \ub2e4\uc2dc \ucc3e\uc9c0 \ubabb\ud588\ub2e4.<\/li>\r\n\t<li><code>3 i l h<\/code> : $i$\ubc88 \uad6c\uc2ac\uc774 \ub4e4\uc5b4 \uc788\ub294 \uc8fc\uba38\ub2c8\ub97c \uad00\ucc30\ud55c\ub2e4. \uadf8 \uc8fc\uba38\ub2c8\uc5d0\ub294 \ubd89\uc740\uc0c9 \uad6c\uc2ac\uc774 $l$\uac1c \uc774\uc0c1 $h$\uac1c \uc774\ud558 \ub4e4\uc5b4 \uc788\uc5c8\ub2e4. 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Each marble is either red or blue. Each marble belonged to its own bag by itself originally.<\/p>\r\n\r\n<p>Jeyeon kept a diary of every change he made to the marbles. The diary consists of&nbsp;$M$&nbsp;entries. There are three different types of entries:<\/p>\r\n\r\n<ul>\r\n\t<li><code>1 i j<\/code>&nbsp;: Combine the bag containing marble&nbsp;$i$&nbsp;and the bag containing marble&nbsp;$j$. ($1\\leq i, j \\leq N$)<\/li>\r\n\t<li><code>2 i<\/code>&nbsp;: Lose marble&nbsp;$i$&nbsp;forever. ($1\\leq i \\leq N$)<\/li>\r\n\t<li><code>3 i l h<\/code>&nbsp;: Observe that the bag containing marble&nbsp;$i$&nbsp;contained at least&nbsp;$l$&nbsp;and at most&nbsp;$h$&nbsp;red marbles. ($1 \\leq i \\leq N, 0 \\leq l \\leq h \\leq N$)<\/li>\r\n<\/ul>\r\n\r\n<p>10 years later, Jeyeon, looked at his diary and tried to restore the color of each of his marbles. Please construct a sequence of colors that satisfies all entries of his diary, or state that no such sequence exists.<\/p>\r\n","input":"<p>The first line contains two integers&nbsp;$N$&nbsp;and&nbsp;$M$&nbsp;($2 \\leq N \\leq 2\\,000$,&nbsp;$1 \\leq M \\leq 4\\,000$).<\/p>\r\n\r\n<p>The next&nbsp;$M$&nbsp;lines contain the diary entries per the format described above.<\/p>\r\n\r\n<p>The input data are designed such that the marbles&nbsp;$i, j$&nbsp;in any type-1 entry were in different bags prior to the entry, and the marble lost in the type-2 entry will never be referenced in any subsequent entry.<\/p>\r\n","output":"<p>On the first line, output&nbsp;<code>YES<\/code>&nbsp;if there is a sequence of colors of the&nbsp;$N$&nbsp;marbles that satisfies all&nbsp;$M$&nbsp;entries. Otherwise, output&nbsp;<code>NO<\/code>.<\/p>\r\n\r\n<p>If the answer is&nbsp;<code>YES<\/code>, output a string of length&nbsp;$N$&nbsp;on the next line. The&nbsp;$i$th character of the string must be&nbsp;<code>R<\/code>&nbsp;if marble&nbsp;$i$&nbsp;is red, or&nbsp;<code>B<\/code>&nbsp;if marble&nbsp;$i$&nbsp;is blue. If there are multiple answers, any of them will be accepted.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"English"}]