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문제

플로브디브의 유명한 초콜릿 가공업자 Bonny는 가로 M개, 세로 N개의 격자에 건포도들이 들어있는, N*M크기의 건포도 초콜릿을 만들었다. 각 1*1 격자에는 최소 1개 이상의 건포도가 들어있으며, 2개 이상의 격자를 가로질러서 존재하는 건포도는 없다.

초기에, 초콜릿은 하나의 거대한 단일 블록으로 이루어져 있고, Bonny는 이 초콜릿을 N*M개의 단일 블록으로 나눠야 한다. Bonny는 굉장히 바쁘기 때문에 욕심쟁이 Peter에게 이 일을 맡기려고 한다. Peter는 직사각형 전체를 일직선으로 자르는 행동만 할 수 있으며, 한번 자를때마다 그에 따른 보상을 요구한다.

Bonny는 수중에 돈이 없지만 남은 건포도가 상당하기 때문에 Peter에게 돈 대신 건포도를 지불하려 한다. 욕심쟁이 Peter는 이 제안을 동의했지만, "초콜릿 한 조각을 작은 두 조각으로 자를 때마다, 초기 큰 초콜릿에 있었던 건포도의 개수만큼의 수입을 받아야 한다" 는 조건을 걸었다.

Bonny는 Peter에게 최소한의 건포도를 주려 한다. Bonny는 각 조각에 있는 건포도의 수를 알며, Peter가 잘라야 하는 건포도의 조각이나 위치 모두 Bonny가 결정할 수 있다. Bonny가 지불해야 하는 건포도의 최소 양을 구하여라.

입력

표준 입력으로부터 다음의 데이터를 읽어야 한다 :

  • 첫번째 줄에는 건포도의 크기 N,M이 주어진다.
  • 이후 N개 줄에 M개의 정수 Rij가 주어진다. 이는 i행 j열에 있는 건포도의 수이다.
  • 1 <= N,M <= 50
  • 1 <= Ri,j <= 1000

출력

Bonny가 주어야 하는 건포도의 양의 최솟값을 출력한다.

예제 입력 1

2 3
2 7 5
1 9 5

예제 출력 1

77

힌트

다음과 같이 자르면 77개의 건포도를 주고 초콜릿을 자를 수 있다.

[{"problem_id":"5463","problem_lang":"0","title":"\uac74\ud3ec\ub3c4","description":"<p><img alt=\"\" src=\"\/upload\/images2\/raisins.png\" style=\"float:right; height:171px; width:252px\" \/>\ud50c\ub85c\ube0c\ub514\ube0c\uc758 \uc720\uba85\ud55c \ucd08\ucf5c\ub9bf \uac00\uacf5\uc5c5\uc790 Bonny\ub294 \uac00\ub85c M\uac1c, \uc138\ub85c N\uac1c\uc758 \uaca9\uc790\uc5d0 \uac74\ud3ec\ub3c4\ub4e4\uc774 \ub4e4\uc5b4\uc788\ub294, N*M\ud06c\uae30\uc758 \uac74\ud3ec\ub3c4 \ucd08\ucf5c\ub9bf\uc744 \ub9cc\ub4e4\uc5c8\ub2e4. \uac01 1*1 \uaca9\uc790\uc5d0\ub294 \ucd5c\uc18c 1\uac1c \uc774\uc0c1\uc758 \uac74\ud3ec\ub3c4\uac00 \ub4e4\uc5b4\uc788\uc73c\uba70, 2\uac1c \uc774\uc0c1\uc758 \uaca9\uc790\ub97c \uac00\ub85c\uc9c8\ub7ec\uc11c \uc874\uc7ac\ud558\ub294 \uac74\ud3ec\ub3c4\ub294 \uc5c6\ub2e4.<\/p>\r\n\r\n<p>\ucd08\uae30\uc5d0, \ucd08\ucf5c\ub9bf\uc740 \ud558\ub098\uc758 \uac70\ub300\ud55c \ub2e8\uc77c \ube14\ub85d\uc73c\ub85c \uc774\ub8e8\uc5b4\uc838 \uc788\uace0, Bonny\ub294 \uc774 \ucd08\ucf5c\ub9bf\uc744 N*M\uac1c\uc758 \ub2e8\uc77c \ube14\ub85d\uc73c\ub85c \ub098\ub220\uc57c \ud55c\ub2e4. Bonny\ub294 \uad49\uc7a5\ud788 \ubc14\uc058\uae30 \ub54c\ubb38\uc5d0 \uc695\uc2ec\uc7c1\uc774 Peter\uc5d0\uac8c \uc774 \uc77c\uc744 \ub9e1\uae30\ub824\uace0 \ud55c\ub2e4. Peter\ub294 \uc9c1\uc0ac\uac01\ud615 \uc804\uccb4\ub97c \uc77c\uc9c1\uc120\uc73c\ub85c \uc790\ub974\ub294 \ud589\ub3d9\ub9cc \ud560 \uc218 \uc788\uc73c\uba70, \ud55c\ubc88 \uc790\ub97c\ub54c\ub9c8\ub2e4 \uadf8\uc5d0 \ub530\ub978 \ubcf4\uc0c1\uc744 \uc694\uad6c\ud55c\ub2e4.<\/p>\r\n\r\n<p>Bonny\ub294 \uc218\uc911\uc5d0 \ub3c8\uc774 \uc5c6\uc9c0\ub9cc \ub0a8\uc740 \uac74\ud3ec\ub3c4\uac00 \uc0c1\ub2f9\ud558\uae30 \ub54c\ubb38\uc5d0 Peter\uc5d0\uac8c \ub3c8 \ub300\uc2e0 \uac74\ud3ec\ub3c4\ub97c \uc9c0\ubd88\ud558\ub824 \ud55c\ub2e4. \uc695\uc2ec\uc7c1\uc774 Peter\ub294 \uc774 \uc81c\uc548\uc744 \ub3d9\uc758\ud588\uc9c0\ub9cc, &quot;\ucd08\ucf5c\ub9bf \ud55c \uc870\uac01\uc744 \uc791\uc740 \ub450 \uc870\uac01\uc73c\ub85c \uc790\ub97c \ub54c\ub9c8\ub2e4, \ucd08\uae30 \ud070 \ucd08\ucf5c\ub9bf\uc5d0 \uc788\uc5c8\ub358 \uac74\ud3ec\ub3c4\uc758 \uac1c\uc218\ub9cc\ud07c\uc758 \uc218\uc785\uc744 \ubc1b\uc544\uc57c \ud55c\ub2e4&quot; \ub294 \uc870\uac74\uc744 \uac78\uc5c8\ub2e4.<\/p>\r\n\r\n<p>Bonny\ub294 Peter\uc5d0\uac8c \ucd5c\uc18c\ud55c\uc758 \uac74\ud3ec\ub3c4\ub97c \uc8fc\ub824 \ud55c\ub2e4. Bonny\ub294 \uac01 \uc870\uac01\uc5d0 \uc788\ub294 \uac74\ud3ec\ub3c4\uc758 \uc218\ub97c \uc54c\uba70, Peter\uac00 \uc798\ub77c\uc57c \ud558\ub294 \uac74\ud3ec\ub3c4\uc758 \uc870\uac01\uc774\ub098 \uc704\uce58 \ubaa8\ub450 Bonny\uac00 \uacb0\uc815\ud560 \uc218 \uc788\ub2e4. Bonny\uac00 \uc9c0\ubd88\ud574\uc57c \ud558\ub294 \uac74\ud3ec\ub3c4\uc758 \ucd5c\uc18c \uc591\uc744 \uad6c\ud558\uc5ec\ub77c.<\/p>\r\n","input":"<p>\ud45c\uc900 \uc785\ub825\uc73c\ub85c\ubd80\ud130 \ub2e4\uc74c\uc758 \ub370\uc774\ud130\ub97c \uc77d\uc5b4\uc57c \ud55c\ub2e4 :<\/p>\r\n\r\n<ul>\r\n\t<li>\uccab\ubc88\uc9f8 \uc904\uc5d0\ub294 \uac74\ud3ec\ub3c4\uc758 \ud06c\uae30 N,M\uc774 \uc8fc\uc5b4\uc9c4\ub2e4.<\/li>\r\n\t<li>\uc774\ud6c4 N\uac1c \uc904\uc5d0 M\uac1c\uc758 \uc815\uc218 Rij\uac00 \uc8fc\uc5b4\uc9c4\ub2e4. \uc774\ub294 i\ud589 j\uc5f4\uc5d0 \uc788\ub294 \uac74\ud3ec\ub3c4\uc758 \uc218\uc774\ub2e4.<\/li>\r\n\t<li>1 &lt;= N,M &lt;= 50<\/li>\r\n\t<li>1 &lt;= Ri,j &lt;= 1000<\/li>\r\n<\/ul>\r\n","output":"<p>Bonny\uac00 \uc8fc\uc5b4\uc57c \ud558\ub294 \uac74\ud3ec\ub3c4\uc758 \uc591\uc758 \ucd5c\uc19f\uac12\uc744 \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"<p>\ub2e4\uc74c\uacfc \uac19\uc774 \uc790\ub974\uba74 77\uac1c\uc758 \uac74\ud3ec\ub3c4\ub97c \uc8fc\uace0 \ucd08\ucf5c\ub9bf\uc744 \uc790\ub97c \uc218 \uc788\ub2e4.<\/p>\r\n\r\n<p style=\"text-align:center\"><img alt=\"\" src=\"\/upload\/images2\/raisins2.png\" style=\"height:82px; width:711px\" \/><\/p>\r\n","original":"0","problem_lang_code":"\ud55c\uad6d\uc5b4"},{"problem_id":"5463","problem_lang":"1","title":"Raisins","description":"<p><img alt=\"\" src=\"\/upload\/images2\/raisins.png\" style=\"float:right; height:171px; width:252px\" \/>Plovdiv&rsquo;s famous master chocolatier Bonny needs to cut a slab of chocolate with raisins. The chocolate is a rectangular block of identical square pieces. The pieces are aligned with the edges of the chocolate, and they are arranged in N rows and M columns, for a total of N*M pieces. Each piece has one or more raisins on it, and no raisins lie between or across pieces.<\/p>\r\n\r\n<p>Initially, the chocolate is one single, monolithic block. Bonny needs to cut it into smaller and smaller blocks until finally she has cut the chocolate down to its N*M individual pieces. As Bonny is very busy, she needs the help of her assistant, Sly Peter, to do the cutting. Peter only makes straight line, end-to-end cuts and he wants to be paid for every single cut he makes. Bonny has no money at hand, but she has plenty of raisins left over, so she offers to pay Peter in raisins. Sly Peter agrees to this arrangement, but under the following condition: every time he cuts a given block of chocolate into two smaller blocks, he has to be paid as many raisins as there are on the block he was given.<\/p>\r\n\r\n<p>Bonny wants to pay Peter as little as possible. She knows how many raisins there are on each of the N*M pieces. She can choose the order in which she gives Peter any remaining blocks, and she can also tell Peter what cuts to make (horizontal or vertical) and where exactly to make them. Help Bonny decide how to cut the chocolate into individual pieces, so that she pays Sly Peter as few raisins as possible.&nbsp;<\/p>\r\n\r\n<p>Write a program that, given the number of raisins on each of the individual pieces, determines the minimum number of raisins that Bonny will have to pay Sly Peter.&nbsp;<\/p>\r\n","input":"<p>Your program must read from standard input the following data:<\/p>\r\n\r\n<ul>\r\n\t<li>The first line contains the integers N and M, separated by a single space.<\/li>\r\n\t<li>The next N lines describe how many raisins there are on each piece of the chocolate. The kth of these N lines describes the kth row of the chocolate. Each such line contains M integers separated by single spaces. The integers describe the pieces on the corresponding row in order from left to right. The pth integer on the kth line (among these N lines) tells you how many raisins are on the piece in the kth row and the pth column.<\/li>\r\n<\/ul>\r\n\r\n<ul>\r\n\t<li>1 &le; N, M &le; 50 The number of pieces on each side of the chocolate<\/li>\r\n\t<li>1 &le; Rk,p &le; 1000 The number of raisins on the piece in the kth row and the pth column<\/li>\r\n<\/ul>\r\n","output":"<p>Your program must write to standard output a single line containing a single integer: the minimum possible number of raisins that Bonny would have to pay Sly Peter.&nbsp;<\/p>\r\n","hint":"<p>One possible way (out of many) to achieve a cost of 77 is as follows:<\/p>\r\n\r\n<p style=\"text-align: center;\"><img alt=\"\" src=\"\/upload\/images2\/raisins2.png\" style=\"height:82px; width:711px\" \/><\/p>\r\n\r\n<p>The first cut that Bonny asks Peter to make separates the third column from the rest of the chocolate. Bonny needs to pay Peter 29 raisins for this.<\/p>\r\n\r\n<p>Then Bonny gives Peter the smaller of the two blocks: the one that has two pieces with 5 raisins each, and asks Peter to cut the block in two in exchange for 10 raisins.<\/p>\r\n\r\n<p>After this, Bonny gives Peter the largest remaining block: the one having pieces with 2, 7, 1 and 9 raisins respectively. Bonny asks Peter to cut it horizontally, separating the first and the second row and pays him 19 raisins.<\/p>\r\n\r\n<p>Following this, Bonny gives Peter the top-left block, paying 9 raisins. Finally, Bonny asks Peter to split the bottom-left block, paying 10 raisins.<\/p>\r\n\r\n<p>The total cost to Bonny is 29 + 10 + 19 + 9 + 10 = 77 raisins. No other cutting arrangement can get the chocolate cut into its 6 pieces at a smaller cost.&nbsp;<\/p>\r\n","original":"1","problem_lang_code":"\uc601\uc5b4"}]

출처

Olympiad > International Olympiad in Informatics > IOI 2009 4번

  • 문제를 번역한 사람: koosaga