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문제

NLCS Jeju는 화재 경보가 자주 울리는 것으로 악명이 높다. 화재 경보가 울리는 이유는 여러 가지가 있는데, 그중 하나는 학생이 장난으로 경보를 울리는 경우이다. 오늘은 NLCS Jeju의 학생인 동호가 작정하고 화재 경보를 울렸다.

화재 경보가 울리면 교실에 있는 $N$명의 학생들은 모두 운동장으로 나가 한 줄로 서야 한다. 모든 학생은 키가 서로 다르고, 학생들에게는 키순으로 $1$번에서 $N$번까지의 번호가 붙어 있다. 학생들이 운동장으로 이동할 때 항상 질서를 잘 지키는 것은 아니기 때문에, 학생들은 초기에 키순으로 서 있지 않을 수도 있다.

학생들이 운동장에 모이면, 선생님은 $1$번부터 $N$번까지 학생들이 모두 모였는지 확인한다. 어떤 학생 $i$보다 키가 큰 학생이 $i$ 앞에 없다면, $i$번 학생을 확인하는 데는 시간이 걸리지 않는다. 그러나, $i$보다 키가 큰 학생이 $i$ 앞에 $k$명 있다면, 학생 $i$가 있다는 사실을 순서대로 앞으로 전달해 주어야 하기 때문에 시간이 $k$초 더 걸린다. 이렇게 모든 학생을 확인하는 데 걸린 시간의 합이 확인 절차에 걸리는 전체 시간이다.

그런데 동호는 화재 경보를 울릴 때부터 수업을 하는 시간을 최대한 줄이고 싶었기 때문에, 확인 절차에 걸리는 전체 시간을 최대한 늘리려고 한다. 이를 위해 동호는 최대 $L$번, 인접한 두 학생의 위치를 교환하려고 한다.

현재 $N$명의 학생들이 서 있는 순서와 정수 $L$이 주어질 때, 최대 $L$번의 행동을 수행한 후, 확인 절차에 걸리는 전체 시간의 최댓값을 구하는 프로그램을 작성하시오.

입력

첫 번째 줄에 두 개의 양의 정수 $N$과 $L$이 공백으로 구분되어 주어진다.

두 번째 줄에 $N$개의 양의 정수가 공백으로 구분되어 주어진다. $i$번째 정수는 줄의 $i$번째에 서 있는 학생의 번호를 의미한다. 모든 학생의 번호는 $1$ 이상 $N$ 이하이며, 모든 학생들은 번호가 서로 다르다.

출력

확인 절차에 걸리는 전체 시간의 최댓값을 나타내는 정수를 출력한다.

제한

  • $1\leq N \leq 500\,000$
  • $1\leq L \leq 10^{18}$

예제 입력 1

5 3
1 3 5 2 4

예제 출력 1

6

학생들의 순서를 세 번 바꿀 수 있기 때문에 다음과 같이 바꿔준다.

$(1\ 3\ 5\ 2\ 4)$ $\rightarrow$ $(3\ 1\ 5\ 2\ 4)$ $\rightarrow$ $(3\ 5\ 1\ 2\ 4)$ $\rightarrow$ $(3\ 5\ 2\ 1\ 4)$

첫 번째와 두 번째 학생을 확인하는 데는 시간이 걸리지 않는다. 세 번째 학생을 확인하는 데는 $2$초, 네 번째 학생을 부르는 데 $3$초, 다섯 번째 학생을 부르는 데 $1$초가 걸리기 때문에 답이 $6$초가 된다.

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\ud559\uc0dd\ub4e4\uc5d0\uac8c\ub294 \ud0a4\uc21c\uc73c\ub85c $1$\ubc88\uc5d0\uc11c $N$\ubc88\uae4c\uc9c0\uc758 \ubc88\ud638\uac00 \ubd99\uc5b4 \uc788\ub2e4. \ud559\uc0dd\ub4e4\uc774 \uc6b4\ub3d9\uc7a5\uc73c\ub85c \uc774\ub3d9\ud560 \ub54c \ud56d\uc0c1 \uc9c8\uc11c\ub97c \uc798 \uc9c0\ud0a4\ub294 \uac83\uc740 \uc544\ub2c8\uae30 \ub54c\ubb38\uc5d0, \ud559\uc0dd\ub4e4\uc740 \ucd08\uae30\uc5d0 \ud0a4\uc21c\uc73c\ub85c \uc11c \uc788\uc9c0 \uc54a\uc744 \uc218\ub3c4 \uc788\ub2e4.<\/p>\r\n\r\n<p>\ud559\uc0dd\ub4e4\uc774 \uc6b4\ub3d9\uc7a5\uc5d0 \ubaa8\uc774\uba74, \uc120\uc0dd\ub2d8\uc740 $1$\ubc88\ubd80\ud130 $N$\ubc88\uae4c\uc9c0 \ud559\uc0dd\ub4e4\uc774 \ubaa8\ub450 \ubaa8\uc600\ub294\uc9c0 \ud655\uc778\ud55c\ub2e4. \uc5b4\ub5a4 \ud559\uc0dd $i$\ubcf4\ub2e4 \ud0a4\uac00 \ud070 \ud559\uc0dd\uc774 $i$ \uc55e\uc5d0 \uc5c6\ub2e4\uba74, $i$\ubc88 \ud559\uc0dd\uc744 \ud655\uc778\ud558\ub294 \ub370\ub294 \uc2dc\uac04\uc774 \uac78\ub9ac\uc9c0 \uc54a\ub294\ub2e4. \uadf8\ub7ec\ub098, $i$\ubcf4\ub2e4 \ud0a4\uac00 \ud070 \ud559\uc0dd\uc774 $i$ \uc55e\uc5d0 $k$\uba85 \uc788\ub2e4\uba74, \ud559\uc0dd $i$\uac00 \uc788\ub2e4\ub294 \uc0ac\uc2e4\uc744 \uc21c\uc11c\ub300\ub85c \uc55e\uc73c\ub85c \uc804\ub2ec\ud574 \uc8fc\uc5b4\uc57c \ud558\uae30 \ub54c\ubb38\uc5d0 \uc2dc\uac04\uc774 $k$\ucd08 \ub354 \uac78\ub9b0\ub2e4. \uc774\ub807\uac8c \ubaa8\ub4e0 \ud559\uc0dd\uc744 \ud655\uc778\ud558\ub294 \ub370 \uac78\ub9b0 \uc2dc\uac04\uc758 \ud569\uc774 \ud655\uc778 \uc808\ucc28\uc5d0 \uac78\ub9ac\ub294 \uc804\uccb4 \uc2dc\uac04\uc774\ub2e4.<\/p>\r\n\r\n<p>\uadf8\ub7f0\ub370 \ub3d9\ud638\ub294 \ud654\uc7ac \uacbd\ubcf4\ub97c \uc6b8\ub9b4 \ub54c\ubd80\ud130 \uc218\uc5c5\uc744 \ud558\ub294 \uc2dc\uac04\uc744 \ucd5c\ub300\ud55c \uc904\uc774\uace0 \uc2f6\uc5c8\uae30 \ub54c\ubb38\uc5d0, \ud655\uc778 \uc808\ucc28\uc5d0 \uac78\ub9ac\ub294 \uc804\uccb4 \uc2dc\uac04\uc744 \ucd5c\ub300\ud55c \ub298\ub9ac\ub824\uace0 \ud55c\ub2e4. \uc774\ub97c \uc704\ud574 \ub3d9\ud638\ub294 \ucd5c\ub300 $L$\ubc88, \uc778\uc811\ud55c \ub450 \ud559\uc0dd\uc758 \uc704\uce58\ub97c \uad50\ud658\ud558\ub824\uace0 \ud55c\ub2e4.<\/p>\r\n\r\n<p>\ud604\uc7ac $N$\uba85\uc758 \ud559\uc0dd\ub4e4\uc774 \uc11c \uc788\ub294 \uc21c\uc11c\uc640 \uc815\uc218 $L$\uc774 \uc8fc\uc5b4\uc9c8 \ub54c, \ucd5c\ub300 $L$\ubc88\uc758 \ud589\ub3d9\uc744 \uc218\ud589\ud55c \ud6c4, \ud655\uc778 \uc808\ucc28\uc5d0 \uac78\ub9ac\ub294 \uc804\uccb4 \uc2dc\uac04\uc758 \ucd5c\ub313\uac12\uc744 \uad6c\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\uc2dc\uc624.<\/p>\r\n","input":"<p>\uccab \ubc88\uc9f8 \uc904\uc5d0 \ub450 \uac1c\uc758 \uc591\uc758 \uc815\uc218 $N$\uacfc $L$\uc774 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\ub450 \ubc88\uc9f8 \uc904\uc5d0 $N$\uac1c\uc758 \uc591\uc758 \uc815\uc218\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4. $i$\ubc88\uc9f8 \uc815\uc218\ub294 \uc904\uc758 $i$\ubc88\uc9f8\uc5d0 \uc11c \uc788\ub294 \ud559\uc0dd\uc758 \ubc88\ud638\ub97c \uc758\ubbf8\ud55c\ub2e4. \ubaa8\ub4e0 \ud559\uc0dd\uc758 \ubc88\ud638\ub294 $1$ \uc774\uc0c1 $N$ \uc774\ud558\uc774\uba70, \ubaa8\ub4e0 \ud559\uc0dd\ub4e4\uc740 \ubc88\ud638\uac00 \uc11c\ub85c \ub2e4\ub974\ub2e4.<\/p>\r\n","output":"<p>\ud655\uc778 \uc808\ucc28\uc5d0 \uac78\ub9ac\ub294 \uc804\uccb4 \uc2dc\uac04\uc758 \ucd5c\ub313\uac12\uc744 \ub098\ud0c0\ub0b4\ub294 \uc815\uc218\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"","original":"1","html_title":"0","problem_lang_tcode":"Korean","limit":"<ul>\r\n\t<li>$1\\leq N \\leq 500\\,000$<\/li>\r\n\t<li>$1\\leq L \\leq 10^{18}$<\/li>\r\n<\/ul>\r\n","sample_explain_1":"<p>\ud559\uc0dd\ub4e4\uc758 \uc21c\uc11c\ub97c \uc138 \ubc88 \ubc14\uafc0 \uc218 \uc788\uae30 \ub54c\ubb38\uc5d0 \ub2e4\uc74c\uacfc \uac19\uc774 \ubc14\uafd4\uc900\ub2e4.<\/p>\r\n\r\n<p>$(1\\ 3\\ 5\\ 2\\ 4)$ $\\rightarrow$ $(3\\ 1\\ 5\\ 2\\ 4)$ $\\rightarrow$ $(3\\ 5\\ 1\\ 2\\ 4)$ $\\rightarrow$ $(3\\ 5\\ 2\\ 1\\ 4)$<\/p>\r\n\r\n<p>\uccab \ubc88\uc9f8\uc640 \ub450 \ubc88\uc9f8 \ud559\uc0dd\uc744 \ud655\uc778\ud558\ub294 \ub370\ub294 \uc2dc\uac04\uc774 \uac78\ub9ac\uc9c0 \uc54a\ub294\ub2e4. \uc138 \ubc88\uc9f8 \ud559\uc0dd\uc744 \ud655\uc778\ud558\ub294 \ub370\ub294 $2$\ucd08, \ub124 \ubc88\uc9f8 \ud559\uc0dd\uc744 \ubd80\ub974\ub294 \ub370 $3$\ucd08, \ub2e4\uc12f \ubc88\uc9f8 \ud559\uc0dd\uc744 \ubd80\ub974\ub294 \ub370 $1$\ucd08\uac00 \uac78\ub9ac\uae30 \ub54c\ubb38\uc5d0 \ub2f5\uc774 $6$\ucd08\uac00 \ub41c\ub2e4.<\/p>\r\n"},{"problem_id":"27897","problem_lang":"1","title":"Exceptional Fire Alarm","description":"<p>NLCS Jeju is infamous for its frequent&nbsp;fire alarms. There are many reasons for&nbsp;triggering a fire alarm, one of which is&nbsp;students&#39; pranks. Today, Dongho, a student in NLCS Jeju, intentionally rang the fire alarm.<\/p>\r\n\r\n<p>When the fire alarm rings, $N$&nbsp;students are required to evacuate&nbsp;to the astroturf and line up in order of their height. Every student&nbsp;has&nbsp;a different height, which means that a unique number from&nbsp;$1$ to&nbsp;$N$ can be given to each student. Since students are sometimes out of order when moving to the astroturf, they&nbsp;may not be in the right order in the astroturf.<\/p>\r\n\r\n<p>Once the students are gathered in the astroturf, teachers register them&nbsp;from student $1$ to $N$. For each student $i$, if there is no student taller than student $i$ in front of him, no time is taken to register him or her. However, if there are $k$ students taller than student $i$ in front of him, it takes $k$ seconds to register the student, as students must&nbsp;pass on the fact that student $i$ is present. We define the total time taken as the sum of time taken to register&nbsp;each student in this manner.<\/p>\r\n\r\n<p>However, Dongho wants to maximise the total time taken in order to minimise his lesson time. He, therefore, decided to change the positions of the adjacent students for at most $L$ times.<\/p>\r\n\r\n<p>The sequence in which $N$ students are lined up and the integer $L$ is given. Write the program to calculate the maximum value of the total time taken.<\/p>\r\n","input":"<p>In the first line, two positive integers $N$ and $L$ are given, separated by a space.<\/p>\r\n\r\n<p>In the second line, $N$ positive integers are given, each separated by a space. $i$th integer denotes $i$th student in the line. Every student&#39;s&nbsp;numbers are in the range of $1$ from $N$, and the numbers are unique.<\/p>\r\n","output":"<p>Print an integer denoting the maximum value of the total time taken.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"English","limit":"<ul>\r\n\t<li>$1\\leq N,L \\leq 500\\,000$<\/li>\r\n\t<li>$1\\leq L \\leq 10^{18}$<\/li>\r\n<\/ul>\r\n","sample_explain_1":"<p>First, change the position of the students in the following way:<\/p>\r\n\r\n<p>$(1\\ 3\\ 5\\ 2\\ 4)$ $\\rightarrow$ $(3\\ 1\\ 5\\ 2\\ 4)$ $\\rightarrow$ $(3\\ 5\\ 1\\ 2\\ 4)$ $\\rightarrow$ $(3\\ 5\\ 2\\ 1\\ 4)$<\/p>\r\n\r\n<p>Since the teacher can see the students in the first and second positions, he would not call these students. Then, the third student would take $2$ seconds to respond; the fourth student will take $3$ seconds to respond; and the fifth student will take $1$ second to respond. Thus, the answer would be a total of $6$ seconds.<\/p>\r\n"}]

출처

High School > NLCS Jeju > GEC-Cup I번