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문제

일직선으로 된 도로를 따라 $N$개의 가로등이 세워져 있다. $i$번째 가로등의 초기 높이는 $A_i$이다$(1 \le i \le N)$. 가로등을 이용하여 전기줄을 설치하려고 한다.

$i$번 가로등과 $j( \gt i)$번 가로등 사이에 전기줄을 걸기 위해서는 다음 두 조건을 모두 만족해야 한다.

  • $A_i = A_j$ (두 가로등의 높이가 같다.)
  • 모든 $i < k < j$에 대하여, $A_k < A_i$이다. (두 가로등 사이에 있는 모든 가로등의 높이는 두 가로등보다 낮다.)

일부 가로등은 관리자의 판단에 따라 높이가 조정되며, 높이가 조정된 가로등으로 인해 전기줄을 걸 수 있는 상황이 변경된다. 

"$x$번째 가로등의 높이를 $h$로 변경"하는 높이 조정 작업은 총 $Q$번 행해진다. 가로등 높이 변경이 이루어질 때마다, 높이 조정 후 전기줄을 걸 수 있는 가로등 쌍의 개수를 계산하는 프로그램을 작성하고자 한다.

입력

첫째 줄에 두 정수 $N$, $Q$가 주어진다. $2 \le N \le 100\,000, 1 \le Q \le 250\,000$

다음 줄에는 $N$개의 정수 $A_1, A_2, \ldots, A_N$가 주어진다. ($1 \le A_i \le 10^9$)

다음 $Q$개의 줄에는 두 정수 $x$, $h$가 주어지며, $A_x = h$를 나타낸다. ($1 \le x \le N, 1 \le h \le 10^9$) 조정 직전의 $x$번째 가로등의 높이는 $h$와 다름이 보장된다.

출력

첫째 줄에 초기에 설치된 가로등에 걸 수 있는 전기줄의 개수를 출력한다.

다음 $Q$개의 줄에는 높이 조정 작업 각각에 대해, 높이 조정 후 가로등에 걸 수 있는 전기줄의 개수를 출력한다.

서브태스크 1 (5점)

  • $N \le 50$
  • $Q \le 100$

서브태스크 2 (8점)

  • $N \le 10\,000$
  • $Q \le 25\,000$

서브태스크 3 (11점)

  • $A_i \le 10, h \le 10$

서브태스크 4 (7점)

  • 모든 높이 조정 작업은 가로등의 높이를 감소시킨다.

서브태스크 5 (15점)

  • 한 번 높이가 증가한 가로등은 이후 높이가 감소하지 않는다.
  • 한 번 높이가 감소한 가로등은 이후 높이가 증가하지 않는다.

서브태스크 6 (12점)

  • $Q \le 8\,000$

서브태스크 7 (16점)

  • 한 번이라도 높이가 변하는 가로등은 총 $8\,000$개 이하이다.

서브태스크 8 (21점)

  • $N \le 40\,000$
  • $Q \le 100\,000$

서브태스크 9 (55점)

  • 추가적인 제약 조건이 없다.

예제 입력 1

6 2
4 2 2 2 4 6
4 6
6 4

예제 출력 1

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2
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(\ub450 \uac00\ub85c\ub4f1 \uc0ac\uc774\uc5d0 \uc788\ub294 \ubaa8\ub4e0 \uac00\ub85c\ub4f1\uc758 \ub192\uc774\ub294 \ub450 \uac00\ub85c\ub4f1\ubcf4\ub2e4 \ub0ae\ub2e4.)<\/li>\r\n<\/ul>\r\n\r\n<p>\uc77c\ubd80 \uac00\ub85c\ub4f1\uc740 \uad00\ub9ac\uc790\uc758 \ud310\ub2e8\uc5d0 \ub530\ub77c \ub192\uc774\uac00 \uc870\uc815\ub418\uba70, \ub192\uc774\uac00 \uc870\uc815\ub41c \uac00\ub85c\ub4f1\uc73c\ub85c \uc778\ud574 \uc804\uae30\uc904\uc744 \uac78 \uc218 \uc788\ub294 \uc0c1\ud669\uc774 \ubcc0\uacbd\ub41c\ub2e4.&nbsp;<\/p>\r\n\r\n<p>&quot;$x$\ubc88\uc9f8 \uac00\ub85c\ub4f1\uc758 \ub192\uc774\ub97c $h$\ub85c \ubcc0\uacbd&quot;\ud558\ub294 \ub192\uc774 \uc870\uc815 \uc791\uc5c5\uc740 \ucd1d $Q$\ubc88 \ud589\ud574\uc9c4\ub2e4. \uac00\ub85c\ub4f1 \ub192\uc774 \ubcc0\uacbd\uc774 \uc774\ub8e8\uc5b4\uc9c8 \ub54c\ub9c8\ub2e4, \ub192\uc774 \uc870\uc815 \ud6c4 \uc804\uae30\uc904\uc744 \uac78 \uc218 \uc788\ub294 \uac00\ub85c\ub4f1 \uc30d\uc758 \uac1c\uc218\ub97c \uacc4\uc0b0\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\uace0\uc790 \ud55c\ub2e4.<\/p>\r\n","input":"<p>\uccab\uc9f8 \uc904\uc5d0 \ub450 \uc815\uc218 $N$, $Q$\uac00 \uc8fc\uc5b4\uc9c4\ub2e4.&nbsp;$2 \\le N \\le 100\\,000, 1 \\le Q \\le 250\\,000$<\/p>\r\n\r\n<p>\ub2e4\uc74c \uc904\uc5d0\ub294 $N$\uac1c\uc758 \uc815\uc218 $A_1, A_2, \\ldots, A_N$\uac00 \uc8fc\uc5b4\uc9c4\ub2e4. ($1 \\le A_i \\le 10^9$)<\/p>\r\n\r\n<p>\ub2e4\uc74c $Q$\uac1c\uc758 \uc904\uc5d0\ub294 \ub450 \uc815\uc218 $x$, $h$\uac00 \uc8fc\uc5b4\uc9c0\uba70, $A_x = h$\ub97c \ub098\ud0c0\ub0b8\ub2e4.&nbsp;($1 \\le x \\le N, 1 \\le h \\le 10^9$)&nbsp;\uc870\uc815 \uc9c1\uc804\uc758 $x$\ubc88\uc9f8 \uac00\ub85c\ub4f1\uc758 \ub192\uc774\ub294 $h$\uc640 \ub2e4\ub984\uc774 \ubcf4\uc7a5\ub41c\ub2e4.<\/p>\r\n","output":"<p>\uccab\uc9f8 \uc904\uc5d0&nbsp;\ucd08\uae30\uc5d0 \uc124\uce58\ub41c \uac00\ub85c\ub4f1\uc5d0 \uac78 \uc218 \uc788\ub294 \uc804\uae30\uc904\uc758 \uac1c\uc218\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n\r\n<p>\ub2e4\uc74c $Q$\uac1c\uc758 \uc904\uc5d0\ub294&nbsp;\ub192\uc774 \uc870\uc815 \uc791\uc5c5 \uac01\uac01\uc5d0 \ub300\ud574, \ub192\uc774 \uc870\uc815 \ud6c4 \uac00\ub85c\ub4f1\uc5d0 \uac78 \uc218 \uc788\ub294 \uc804\uae30\uc904\uc758 \uac1c\uc218\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"","original":"1","html_title":"0","problem_lang_tcode":"Korean","subtask1":"<ul>\r\n\t<li>$N \\le 50$<\/li>\r\n\t<li>$Q \\le 100$<\/li>\r\n<\/ul>\r\n","subtask2":"<ul>\r\n\t<li>$N \\le 10\\,000$<\/li>\r\n\t<li>$Q \\le 25\\,000$<\/li>\r\n<\/ul>\r\n","subtask3":"<ul>\r\n\t<li>$A_i \\le 10, h \\le 10$<\/li>\r\n<\/ul>\r\n","subtask4":"<ul>\r\n\t<li>\ubaa8\ub4e0 \ub192\uc774 \uc870\uc815 \uc791\uc5c5\uc740 \uac00\ub85c\ub4f1\uc758 \ub192\uc774\ub97c \uac10\uc18c\uc2dc\ud0a8\ub2e4.<\/li>\r\n<\/ul>\r\n","subtask5":"<ul>\r\n\t<li>\ud55c \ubc88 \ub192\uc774\uac00 \uc99d\uac00\ud55c \uac00\ub85c\ub4f1\uc740 \uc774\ud6c4 \ub192\uc774\uac00 \uac10\uc18c\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/li>\r\n\t<li>\ud55c \ubc88 \ub192\uc774\uac00 \uac10\uc18c\ud55c \uac00\ub85c\ub4f1\uc740 \uc774\ud6c4 \ub192\uc774\uac00 \uc99d\uac00\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/li>\r\n<\/ul>\r\n","subtask6":"<ul>\r\n\t<li>$Q \\le 8\\,000$<\/li>\r\n<\/ul>\r\n","subtask7":"<ul>\r\n\t<li>\ud55c \ubc88\uc774\ub77c\ub3c4 \ub192\uc774\uac00 \ubcc0\ud558\ub294 \uac00\ub85c\ub4f1\uc740 \ucd1d $8\\,000$\uac1c \uc774\ud558\uc774\ub2e4.<\/li>\r\n<\/ul>\r\n","subtask8":"<ul>\r\n\t<li>$N \\le 40\\,000$<\/li>\r\n\t<li>$Q \\le 100\\,000$<\/li>\r\n<\/ul>\r\n","subtask9":"<ul>\r\n\t<li>\ucd94\uac00\uc801\uc778 \uc81c\uc57d \uc870\uac74\uc774 \uc5c6\ub2e4.<\/li>\r\n<\/ul>\r\n"},{"problem_id":"22033","problem_lang":"1","title":"Streetlights","description":"<p>There are $N$ streetlights along the straight road. The initial height of the $i$th streetlight is a positive integer $A_i$ $(1 \\le i \\le N)$.<\/p>\r\n\r\n<p>You are trying to install an electric wire between some streetlights. To install an electric wire between the streetlights $i$ and $j( \\gt i)$, the following conditions must be satisfied.<\/p>\r\n\r\n<ul>\r\n\t<li>$A_i = A_j$<\/li>\r\n\t<li>For every $i &lt; k &lt; j$, $A_k &lt; A_i$.<\/li>\r\n<\/ul>\r\n\r\n<p>You are interested in a number of pairs $1 \\le i &lt; j \\le N$ which you can install an electric wire between the streetlight $i$ and $j$.<\/p>\r\n\r\n<p>In addition, the city may adjust the height of some streetlight for $Q$ times. Each adjustments are given as a pair of positive integer $(x, h)$, which indicates that the height of $x$-th streetlight was adjusted to $h$. In other words, $A_x = h$. After each queries, you should find the updated number of pairs which you can install an electric wire between.<\/p>\r\n","input":"<p>The first line contains two integers $N, Q$ ($2 \\le N \\le 100\\,000, 1 \\le Q \\le 250\\,000$)<\/p>\r\n\r\n<p>The next line contains $N$ integers $A_1, A_2, \\ldots, A_N$ ($1 \\le A_i \\le 10^9$)<\/p>\r\n\r\n<p>The next $Q$ lines contain two integers $x, h$, denoting that $A_x = h$ after the query ($1 \\le x \\le N, 1 \\le h \\le 10^9$). It is guaranteed that the $h$ is different from the original height of $x$-th streetlight.<\/p>\r\n","output":"<p>In the first line, print the number of pairs which you can install an electric wire between.<\/p>\r\n\r\n<p>In the next $Q$ lines, print the number of pairs which you can install an electric wire between, after each updates.<\/p>\r\n\r\n<p>In total, you have to print $Q+1$ integers.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"English","subtask1":"<ul>\r\n\t<li>$N \\le 50$<\/li>\r\n\t<li>$Q \\le 100$<\/li>\r\n<\/ul>\r\n","subtask2":"<ul>\r\n\t<li>$N \\le 10\\,000$<\/li>\r\n\t<li>$Q \\le 25\\,000$<\/li>\r\n<\/ul>\r\n","subtask3":"<ul>\r\n\t<li>$A_i \\le 10, h \\le 10$<\/li>\r\n<\/ul>\r\n","subtask4":"<ul>\r\n\t<li>Each adjustment only decreases the height of the streetlight.<\/li>\r\n<\/ul>\r\n","subtask5":"<ul>\r\n\t<li>Once the streetlight had been adjusted to decrease its height, it will never be adjusted to increase its height.<\/li>\r\n\t<li>Once the streetlight had been adjusted to increase its height, it will never be adjusted to decrease its height.<\/li>\r\n<\/ul>\r\n","subtask6":"<ul>\r\n\t<li>$Q \\le 8\\,000$<\/li>\r\n<\/ul>\r\n","subtask7":"<ul>\r\n\t<li>At most $8\\,000$ different streetlights will have their height adjusted.<\/li>\r\n<\/ul>\r\n","subtask8":"<ul>\r\n\t<li>$N \\le 40\\,000$<\/li>\r\n\t<li>$Q \\le 100\\,000$<\/li>\r\n<\/ul>\r\n","subtask9":"<ul>\r\n\t<li>No additional limits.<\/li>\r\n<\/ul>\r\n"}]

채점 및 기타 정보

  • 예제는 채점하지 않는다.
  • 이 문제의 채점 우선 순위는 2이다.