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문제

오늘은 IOI양의 생일이다. 이 날을 위해 JOI군은 생일 케이크를 예약했다. 원형 케이크 하나를 통채로 예약할 생각이었지만 착오가 있어서 $N$조각의 케이크를 예약해 버렸다. 각 조각에는 1번 부터 $N$번까지 번호가 붙어 있고, $i$ 번째 ($1 \le i \le N$) 조각의 가치는 $V_i$이고, 색의 짙음은 $C_i$이다.

JOI군은 서로 다른 $M$개의 케이크를 골라, 원하는 순서대로 배열해 합쳐서 원형 케이크를 만들기로 결심했다. 케이크 조각들이 $k_1$번, $\cdots$, $k_M$번 조각의 순서로 나열되어 있을 때, 이 케이크의 아름다움은

$$ \sum_{j=1}^{M} {V_{k_j}} - \sum_{j=1}^{M} {\left| C_{k_j} - C_{k_{j+1}}\right|} $$

으로 정의된다. (단, $k_{M+1} = k_1$ 이다.) 즉, 아름다움은 사용된 케이크 조각의 가치의 합으로 부터 인접한 두 케이크의 색의 짙음에 차의 절댓값의 합계로 정의된다. JOI군은 되도록이면 원형 케이크의 가치의 합을 최대로 하고싶다.

케이크 조각의 갯수, 각 케이크 조각의 가치와 색의 짙음, 원형 케이크를 만들기 위해 필요한 조각의 갯수가 주어졌을 때, JOI군이 만들 수 있는 원형 케이크의 아름다움의 최댓값을 구하는 프로그램을 작성하여라.

입력

표준 입력에서 다음과 같은 형식으로 주어진다. 모든 값은 정수이다.

$N$ $M$

$V_1$ $C_1$

$\vdots$

$V_N$ $C_N$

출력

표준 출력으로 한 개의 줄에 하나의 수를 출력하여라. 이는 JOI군이 만들 수 있는 원형 케이크의 아름다움의 최댓값이다.

제한

  • $3 \le N \le 200\ 000$.
  • $3 \le M \le N$.
  • $1 \le V_i \le 1\ 000\ 000\ 000$ ($1 \le i \le N$).
  • $1 \le C_i \le 1\ 000\ 000\ 000$ ($1 \le i \le N$).

서브태스크

번호 배점 제한
1 5

N ≤ 100.

2 19

N ≤ 2000.

3 76

No additional constraints.

예제 입력 1

5 3
2 1
4 2
6 4
8 8
10 16

예제 출력 1

6

JOI군이 조각 1번, 3번, 2번 조각을 골라서 순서대로 붙이면, 조각의 가치의 합은 $2+6+4=12$ 이고, 케이크의 짙음의 차이 합은 $|1-4|+|4-2|+|2-1|=6$이다. 그래서 원형 케이크의 아름다움은 $12-6=6$이다.
또한, 2번, 3번, 4번 조각을 골라서 순서대로 붙여서 아름다움이 6인 원형 케이크를 만들 수도 있다.   
더 아름다운 원형 케이크를 만들 수는 없기 때문에, 6을 출력해야 한다.

예제 입력 2

8 4
112103441 501365808
659752417 137957977
86280801 257419447
902409188 565237611
965602301 689654312
104535476 646977261
945132881 114821749
198700181 915994879

예제 출력 2

2323231661
[{"problem_id":"17677","problem_lang":"0","title":"\ucf00\uc774\ud06c 3","description":"<p>\uc624\ub298\uc740 IOI\uc591\uc758 \uc0dd\uc77c\uc774\ub2e4. \uc774 \ub0a0\uc744 \uc704\ud574 JOI\uad70\uc740 \uc0dd\uc77c \ucf00\uc774\ud06c\ub97c \uc608\uc57d\ud588\ub2e4. \uc6d0\ud615 \ucf00\uc774\ud06c \ud558\ub098\ub97c \ud1b5\ucc44\ub85c \uc608\uc57d\ud560 \uc0dd\uac01\uc774\uc5c8\uc9c0\ub9cc \ucc29\uc624\uac00 \uc788\uc5b4\uc11c $N$\uc870\uac01\uc758 \ucf00\uc774\ud06c\ub97c \uc608\uc57d\ud574 \ubc84\ub838\ub2e4. \uac01 \uc870\uac01\uc5d0\ub294 1\ubc88 \ubd80\ud130 $N$\ubc88\uae4c\uc9c0 \ubc88\ud638\uac00 \ubd99\uc5b4 \uc788\uace0, $i$ \ubc88\uc9f8 ($1 \\le i \\le N$) \uc870\uac01\uc758 \uac00\uce58\ub294 $V_i$\uc774\uace0, \uc0c9\uc758 \uc9d9\uc74c\uc740 $C_i$\uc774\ub2e4.<\/p>\r\n\r\n<p>JOI\uad70\uc740 \uc11c\ub85c \ub2e4\ub978 $M$\uac1c\uc758 \ucf00\uc774\ud06c\ub97c \uace8\ub77c, \uc6d0\ud558\ub294 \uc21c\uc11c\ub300\ub85c \ubc30\uc5f4\ud574 \ud569\uccd0\uc11c \uc6d0\ud615 \ucf00\uc774\ud06c\ub97c \ub9cc\ub4e4\uae30\ub85c \uacb0\uc2ec\ud588\ub2e4. \ucf00\uc774\ud06c \uc870\uac01\ub4e4\uc774 $k_1$\ubc88, $\\cdots$, $k_M$\ubc88 \uc870\uac01\uc758 \uc21c\uc11c\ub85c \ub098\uc5f4\ub418\uc5b4 \uc788\uc744 \ub54c, \uc774 \ucf00\uc774\ud06c\uc758 \uc544\ub984\ub2e4\uc6c0\uc740<\/p>\r\n\r\n<p>$$ \\sum_{j=1}^{M} {V_{k_j}} - \\sum_{j=1}^{M} {\\left| C_{k_j} - C_{k_{j+1}}\\right|} $$<\/p>\r\n\r\n<p>\uc73c\ub85c \uc815\uc758\ub41c\ub2e4. (\ub2e8, $k_{M+1} = k_1$ \uc774\ub2e4.) \uc989, \uc544\ub984\ub2e4\uc6c0\uc740 \uc0ac\uc6a9\ub41c \ucf00\uc774\ud06c \uc870\uac01\uc758 \uac00\uce58\uc758 \ud569\uc73c\ub85c \ubd80\ud130 \uc778\uc811\ud55c \ub450 \ucf00\uc774\ud06c\uc758 \uc0c9\uc758 \uc9d9\uc74c\uc5d0 \ucc28\uc758 \uc808\ub313\uac12\uc758 \ud569\uacc4\ub85c \uc815\uc758\ub41c\ub2e4. JOI\uad70\uc740 \ub418\ub3c4\ub85d\uc774\uba74 \uc6d0\ud615 \ucf00\uc774\ud06c\uc758 \uac00\uce58\uc758 \ud569\uc744 \ucd5c\ub300\ub85c \ud558\uace0\uc2f6\ub2e4.<\/p>\r\n\r\n<p>\ucf00\uc774\ud06c \uc870\uac01\uc758 \uac2f\uc218, \uac01 \ucf00\uc774\ud06c \uc870\uac01\uc758 \uac00\uce58\uc640 \uc0c9\uc758 \uc9d9\uc74c, \uc6d0\ud615 \ucf00\uc774\ud06c\ub97c \ub9cc\ub4e4\uae30 \uc704\ud574 \ud544\uc694\ud55c \uc870\uac01\uc758 \uac2f\uc218\uac00 \uc8fc\uc5b4\uc84c\uc744 \ub54c, JOI\uad70\uc774 \ub9cc\ub4e4 \uc218 \uc788\ub294 \uc6d0\ud615 \ucf00\uc774\ud06c\uc758 \uc544\ub984\ub2e4\uc6c0\uc758 \ucd5c\ub313\uac12\uc744 \uad6c\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\uc5ec\ub77c.<\/p>\r\n","input":"<p>\ud45c\uc900 \uc785\ub825\uc5d0\uc11c \ub2e4\uc74c\uacfc \uac19\uc740 \ud615\uc2dd\uc73c\ub85c \uc8fc\uc5b4\uc9c4\ub2e4. \ubaa8\ub4e0 \uac12\uc740 \uc815\uc218\uc774\ub2e4.<\/p>\r\n\r\n<p>$N$ $M$<\/p>\r\n\r\n<p>$V_1$ $C_1$<\/p>\r\n\r\n<p>$\\vdots$<\/p>\r\n\r\n<p>$V_N$ $C_N$<\/p>\r\n","output":"<p>\ud45c\uc900 \ucd9c\ub825\uc73c\ub85c \ud55c \uac1c\uc758 \uc904\uc5d0 \ud558\ub098\uc758 \uc218\ub97c \ucd9c\ub825\ud558\uc5ec\ub77c. \uc774\ub294 JOI\uad70\uc774 \ub9cc\ub4e4 \uc218 \uc788\ub294 \uc6d0\ud615 \ucf00\uc774\ud06c\uc758 \uc544\ub984\ub2e4\uc6c0\uc758 \ucd5c\ub313\uac12\uc774\ub2e4.<\/p>\r\n","hint":"","original":"1","html_title":"0","problem_lang_tcode":"Korean","limit":"<ul>\r\n\t<li>$3 \\le N \\le 200\\ 000$.<\/li>\r\n\t<li>$3 \\le M \\le N$.<\/li>\r\n\t<li>$1 \\le V_i \\le 1\\ 000\\ 000\\ 000$ ($1 \\le i \\le N$).<\/li>\r\n\t<li>$1 \\le C_i \\le 1\\ 000\\ 000\\ 000$ ($1 \\le i \\le N$).<\/li>\r\n<\/ul>\r\n","subtask1":"<p>N &le; 100.<\/p>\r\n","subtask2":"<p>N &le; 2000.<\/p>\r\n","subtask3":"<p>No additional constraints.<\/p>\r\n","sample_explain_1":"<p>JOI\uad70\uc774 \uc870\uac01 1\ubc88, 3\ubc88, 2\ubc88 \uc870\uac01\uc744 \uace8\ub77c\uc11c \uc21c\uc11c\ub300\ub85c \ubd99\uc774\uba74, \uc870\uac01\uc758 \uac00\uce58\uc758 \ud569\uc740 $2+6+4=12$ \uc774\uace0, \ucf00\uc774\ud06c\uc758 \uc9d9\uc74c\uc758 \ucc28\uc774 \ud569\uc740 $|1-4|+|4-2|+|2-1|=6$\uc774\ub2e4. \uadf8\ub798\uc11c \uc6d0\ud615 \ucf00\uc774\ud06c\uc758 \uc544\ub984\ub2e4\uc6c0\uc740 $12-6=6$\uc774\ub2e4.<br \/>\r\n\ub610\ud55c, 2\ubc88, 3\ubc88, 4\ubc88 \uc870\uac01\uc744 \uace8\ub77c\uc11c \uc21c\uc11c\ub300\ub85c \ubd99\uc5ec\uc11c \uc544\ub984\ub2e4\uc6c0\uc774 6\uc778 \uc6d0\ud615 \ucf00\uc774\ud06c\ub97c \ub9cc\ub4e4 \uc218\ub3c4 \uc788\ub2e4.&nbsp;&nbsp;&nbsp;<br \/>\r\n\ub354 \uc544\ub984\ub2e4\uc6b4 \uc6d0\ud615 \ucf00\uc774\ud06c\ub97c \ub9cc\ub4e4 \uc218\ub294 \uc5c6\uae30 \ub54c\ubb38\uc5d0, 6\uc744 \ucd9c\ub825\ud574\uc57c \ud55c\ub2e4.<\/p>\r\n"},{"problem_id":"17677","problem_lang":"1","title":"Cake 3","description":"<p>Today is IOI-chan&rsquo;s birthday, so her brother JOI-kun pre-ordered her birthday cake. Though he planned to buy a whole cake, he mistakenly ordered N pieces of cake. They are numbered from 1 to N and each piece of cake has value and color. The value of the piece i (1 &le; i &le; N) is Vi and the depth of its color is C<sub>i<\/sub>.<\/p>\r\n\r\n<p>In order to make a whole cake, he decided to choose M distinct pieces and to arrange them in a circular form in an arbitrary order. The beauty of the whole cake he makes is defined as<\/p>\r\n\r\n<p>\\[\\sum_{j=1}^{M}{V_{k_j}} - \\sum_{j=1}^{M}{\\left|C_{k_j} - C_{k_{j+1}}\\right|}\\]<\/p>\r\n\r\n<p>if he chooses the pieces k<sub>1<\/sub>, . . . , kM and arranges them in this order (here we set k<sub>M+1<\/sub> = k<sub>1<\/sub>). In other words, the beauty of the whole cake is the sum of the values of its pieces minus the sum of the differences in the depth of the color between every two adjacent pieces. JOI-kun wants to make the whole cake as beautiful as possible.<\/p>\r\n\r\n<p>Write a program which, given the number of pieces, the number of pieces needed to make a whole cake, the value and the depth of color for each piece, calculates the maximum beauty of a whole cake JOI-kun can make.<\/p>\r\n","input":"<p>Read the following data from the standard input. All the values in the input are integers.<\/p>\r\n\r\n<pre>\r\nN M\r\nV<sub>1<\/sub> C<sub>1<\/sub>\r\n:\r\nV<sub>N<\/sub> C<sub>N<\/sub><\/pre>\r\n","output":"<p>Write one line to the standard output. The output should contain the maximum beauty of the whole cake JOI-kun can make.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"English","limit":"<ul>\r\n\t<li>3 &le; N &le; 200 000.<\/li>\r\n\t<li>3 &le; M &le; N.<\/li>\r\n\t<li>1 &le; V<sub>i<\/sub> &le; 1000 000 000 (1 &le; i &le; N).<\/li>\r\n\t<li>1 &le; C<sub>i<\/sub> &le; 1000 000 000 (1 &le; i &le; N).<\/li>\r\n<\/ul>\r\n","subtask1":"<p>N &le; 100.<\/p>\r\n","subtask2":"<p>N &le; 2000.<\/p>\r\n","subtask3":"<p>No additional constraints.<\/p>\r\n","sample_explain_1":"<p>If JOI-kun chooses the pieces 1, 3 and 2 and arranges them in this order, the sum of the values of its pieces is 2 + 6 + 4 = 12 and the sum of the differences in the depth of the color is |1 &minus; 4| + |4 &minus; 2| + |2 &minus; 1| = 6. Thus, the beauty of the whole cake is 12 &minus; 6 = 6.<\/p>\r\n\r\n<p>He can also make a whole cake with beauty 6 if he chooses the pieces 2, 3 and 4 and arrange them in this order.<\/p>\r\n\r\n<p>Since he cannot make a more beautiful whole cake, you should output 6.<\/p>\r\n"}]

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