시간 제한메모리 제한제출정답맞힌 사람정답 비율
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문제

덕인 교수는 알고리즘 과목을 강의하는 교수다. 덕인 교수는 다가오는 중간고사 시험 문제를 준비하면서, 얼마 전 학생들에게 가르친 최대 부분합 문제를 추가하기로 했다. 최대 부분합 문제는 다음과 같다.

  • 배열 $A=[a_1, a_2, \dots , a_n]$가 주어질 때, $max_{1 \leq i \leq j \leq n}(\sum_{k=i}^{j}a_k)$를 구하여라.

덕인 교수는 수열 하나를 주고, 해당 수열에서 최대 부분합을 구하도록 할 심산이다. 덕인 교수는 수열 제작의 대가로, 다음과 같은 과정으로 수열을 만든다고 알려져 있다.

  • 정수만으로 구성된 $N \times N$ 크기의 이차원 배열을 준비한다.
  • $(1, 1)$에서 출발해 아래 혹은 오른쪽으로 이동하는 것을 반복하여 $(N, N)$에 도착한다. 참고로 $(i, j)$에서 아래로 이동하면 $(i+1, j)$에 도달하고, 오른쪽으로 이동하면 $(i, j+1)$에 도달한다.
  • 지나온 칸에 적힌 정수를 지나온 순서대로 나열하여 길이 $2N-1$의 수열을 완성한다.

덕인 교수는 '답이 $K$인 문제는 아름다운 문제'라는 신념을 가지고 있어서, 최대 부분합이 $K$인 수열을 만들려고 한다. 여기에 더해서, 최대 부분합이 $K$인 수열을 최대한 많은 방법으로 만들려고 한다. 덕인 교수의 조교인 당신은 $N \times N$ 크기의 이차원 배열이 주어지면, 최대 부분합이 $K$인 수열을 만드는 서로 다른 방법의 수를 구해야 한다. 어떤 두 방법이 서로 다르다는 것은 두 수열을 구성하는 이차원 배열상의 경로가 서로 다르다는 것을 의미한다.

입력

첫 번째 줄에는 이차원 배열의 크기 $N$과 만들고자 하는 최대 부분합 $K$가 주어진다. $(1 \leq N \leq 20, -4 \times 10^{10} \leq K \leq $ $4 \times 10^{10})$

그 다음 $N$개의 줄에 걸쳐 각 줄에 $N$개의 정수가 공백으로 구분되어 주어진다. 구체적으로, $i$번째 줄의 $j$번째 정수는 이차원 배열 $A$의 $(i, j)$에 위치하는 $A_{i,j}$를 의미한다. $(-10^9 \leq A_{i,j} \leq 10^9)$

출력

주어진 배열에서 최대 부분합이 $K$인 수열을 만드는 서로 다른 방법의 수를 출력한다.

예제 입력 1

3 3
1 2 -5
-2 3 0
-1 -1 1

예제 출력 1

2

예제 입력 2

4 3
1 -1 1 1
1 1 1 1
1 1 1 1
1 1 -1 1

예제 출력 2

4

노트

첫 번째 예제에서 만들 수 있는 수열들은 다음과 같다.

  • $[1, 2, -5, 0, 1]$
  • $[1, 2, 3, 0, 1]$
  • $[1, 2, 3, -1, 1]$
  • $[1, -2, 3, 0, 1]$
  • $[1, -2, 3, -1, 1]$
  • $[1, -2, -1, -1, 1]$

이 중에서 최대 부분합이 3인 수열은 1번째와 5번째 수열뿐이므로 답으로 2를 출력한다.

두 번째 예제에서는 만들 수 있는 수열들 중 $[1, -1, 1, 1, 1, -1, 1]$만이 최대 부분합이 3이고, 이러한 수열을 만들기 위해서는 $(1, 2)$와 $(4, 3)$을 반드시 지나야 하므로 경우의 수는 4가 된다.

[{"problem_id":"22882","problem_lang":"0","title":"\uc2dc\ud5d8 \ubb38\uc81c \ucd9c\uc81c","description":"<p>\ub355\uc778 \uad50\uc218\ub294 \uc54c\uace0\ub9ac\uc998 \uacfc\ubaa9\uc744 \uac15\uc758\ud558\ub294 \uad50\uc218\ub2e4. \ub355\uc778 \uad50\uc218\ub294 \ub2e4\uac00\uc624\ub294 \uc911\uac04\uace0\uc0ac \uc2dc\ud5d8 \ubb38\uc81c\ub97c \uc900\ube44\ud558\uba74\uc11c, \uc5bc\ub9c8 \uc804 \ud559\uc0dd\ub4e4\uc5d0\uac8c \uac00\ub974\uce5c \ucd5c\ub300 \ubd80\ubd84\ud569 \ubb38\uc81c\ub97c \ucd94\uac00\ud558\uae30\ub85c \ud588\ub2e4. \ucd5c\ub300 \ubd80\ubd84\ud569 \ubb38\uc81c\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>\ubc30\uc5f4 $A=[a_1, a_2, \\dots , a_n]$\uac00 \uc8fc\uc5b4\uc9c8 \ub54c, $max_{1 \\leq i \\leq j \\leq n}(\\sum_{k=i}^{j}a_k)$\ub97c \uad6c\ud558\uc5ec\ub77c.<\/li>\r\n<\/ul>\r\n\r\n<p>\ub355\uc778 \uad50\uc218\ub294 \uc218\uc5f4 \ud558\ub098\ub97c \uc8fc\uace0, \ud574\ub2f9 \uc218\uc5f4\uc5d0\uc11c \ucd5c\ub300 \ubd80\ubd84\ud569\uc744 \uad6c\ud558\ub3c4\ub85d \ud560 \uc2ec\uc0b0\uc774\ub2e4. \ub355\uc778 \uad50\uc218\ub294 \uc218\uc5f4 \uc81c\uc791\uc758 \ub300\uac00\ub85c, \ub2e4\uc74c\uacfc \uac19\uc740 \uacfc\uc815\uc73c\ub85c \uc218\uc5f4\uc744 \ub9cc\ub4e0\ub2e4\uace0 \uc54c\ub824\uc838 \uc788\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>\uc815\uc218\ub9cc\uc73c\ub85c \uad6c\uc131\ub41c $N \\times N$ \ud06c\uae30\uc758 \uc774\ucc28\uc6d0 \ubc30\uc5f4\uc744 \uc900\ube44\ud55c\ub2e4.<\/li>\r\n\t<li>$(1, 1)$\uc5d0\uc11c \ucd9c\ubc1c\ud574 \uc544\ub798 \ud639\uc740 \uc624\ub978\ucabd\uc73c\ub85c \uc774\ub3d9\ud558\ub294 \uac83\uc744 \ubc18\ubcf5\ud558\uc5ec $(N, N)$\uc5d0 \ub3c4\ucc29\ud55c\ub2e4. \ucc38\uace0\ub85c $(i, j)$\uc5d0\uc11c \uc544\ub798\ub85c \uc774\ub3d9\ud558\uba74 $(i+1, j)$\uc5d0 \ub3c4\ub2ec\ud558\uace0, \uc624\ub978\ucabd\uc73c\ub85c \uc774\ub3d9\ud558\uba74 $(i, j+1)$\uc5d0 \ub3c4\ub2ec\ud55c\ub2e4.<\/li>\r\n\t<li>\uc9c0\ub098\uc628 \uce78\uc5d0 \uc801\ud78c \uc815\uc218\ub97c \uc9c0\ub098\uc628 \uc21c\uc11c\ub300\ub85c \ub098\uc5f4\ud558\uc5ec \uae38\uc774 $2N-1$\uc758 \uc218\uc5f4\uc744 \uc644\uc131\ud55c\ub2e4.<\/li>\r\n<\/ul>\r\n\r\n<p>\ub355\uc778 \uad50\uc218\ub294 &#39;\ub2f5\uc774 $K$\uc778 \ubb38\uc81c\ub294 \uc544\ub984\ub2e4\uc6b4 \ubb38\uc81c&#39;\ub77c\ub294 \uc2e0\ub150\uc744 \uac00\uc9c0\uace0 \uc788\uc5b4\uc11c, \ucd5c\ub300 \ubd80\ubd84\ud569\uc774 $K$\uc778 \uc218\uc5f4\uc744 \ub9cc\ub4e4\ub824\uace0 \ud55c\ub2e4. \uc5ec\uae30\uc5d0 \ub354\ud574\uc11c, \ucd5c\ub300 \ubd80\ubd84\ud569\uc774 $K$\uc778 \uc218\uc5f4\uc744 \ucd5c\ub300\ud55c \ub9ce\uc740 \ubc29\ubc95\uc73c\ub85c \ub9cc\ub4e4\ub824\uace0 \ud55c\ub2e4. \ub355\uc778 \uad50\uc218\uc758 \uc870\uad50\uc778 \ub2f9\uc2e0\uc740 $N \\times N$ \ud06c\uae30\uc758 \uc774\ucc28\uc6d0 \ubc30\uc5f4\uc774 \uc8fc\uc5b4\uc9c0\uba74, \ucd5c\ub300 \ubd80\ubd84\ud569\uc774 $K$\uc778 \uc218\uc5f4\uc744 \ub9cc\ub4dc\ub294 \uc11c\ub85c \ub2e4\ub978 \ubc29\ubc95\uc758 \uc218\ub97c \uad6c\ud574\uc57c \ud55c\ub2e4. \uc5b4\ub5a4 \ub450 \ubc29\ubc95\uc774 \uc11c\ub85c \ub2e4\ub974\ub2e4\ub294 \uac83\uc740 \ub450 \uc218\uc5f4\uc744 \uad6c\uc131\ud558\ub294 \uc774\ucc28\uc6d0 \ubc30\uc5f4\uc0c1\uc758 \uacbd\ub85c\uac00 \uc11c\ub85c \ub2e4\ub974\ub2e4\ub294 \uac83\uc744 \uc758\ubbf8\ud55c\ub2e4.<\/p>\r\n","input":"<p>\uccab \ubc88\uc9f8 \uc904\uc5d0\ub294 \uc774\ucc28\uc6d0 \ubc30\uc5f4\uc758 \ud06c\uae30 $N$\uacfc \ub9cc\ub4e4\uace0\uc790 \ud558\ub294 \ucd5c\ub300 \ubd80\ubd84\ud569 $K$\uac00 \uc8fc\uc5b4\uc9c4\ub2e4. $(1 \\leq N \\leq 20, -4 \\times 10^{10} \\leq K \\leq $ $4 \\times 10^{10})$<\/p>\r\n\r\n<p>\uadf8 \ub2e4\uc74c $N$\uac1c\uc758 \uc904\uc5d0 \uac78\uccd0 \uac01 \uc904\uc5d0 $N$\uac1c\uc758 \uc815\uc218\uac00 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4. \uad6c\uccb4\uc801\uc73c\ub85c, $i$\ubc88\uc9f8 \uc904\uc758 $j$\ubc88\uc9f8 \uc815\uc218\ub294 \uc774\ucc28\uc6d0 \ubc30\uc5f4 $A$\uc758 $(i, j)$\uc5d0 \uc704\uce58\ud558\ub294 $A_{i,j}$\ub97c \uc758\ubbf8\ud55c\ub2e4. $(-10^9 \\leq A_{i,j} \\leq 10^9)$<\/p>\r\n","output":"<p>\uc8fc\uc5b4\uc9c4 \ubc30\uc5f4\uc5d0\uc11c \ucd5c\ub300 \ubd80\ubd84\ud569\uc774 $K$\uc778 \uc218\uc5f4\uc744 \ub9cc\ub4dc\ub294 \uc11c\ub85c \ub2e4\ub978 \ubc29\ubc95\uc758 \uc218\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"<p>\uccab \ubc88\uc9f8 \uc608\uc81c\uc5d0\uc11c \ub9cc\ub4e4 \uc218 \uc788\ub294 \uc218\uc5f4\ub4e4\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>$[1, 2, -5, 0, 1]$<\/li>\r\n\t<li>$[1, 2, 3, 0, 1]$<\/li>\r\n\t<li>$[1, 2, 3, -1, 1]$<\/li>\r\n\t<li>$[1, -2, 3, 0, 1]$<\/li>\r\n\t<li>$[1, -2, 3, -1, 1]$<\/li>\r\n\t<li>$[1, -2, -1, -1, 1]$<\/li>\r\n<\/ul>\r\n\r\n<p>\uc774 \uc911\uc5d0\uc11c \ucd5c\ub300 \ubd80\ubd84\ud569\uc774 3\uc778 \uc218\uc5f4\uc740 1\ubc88\uc9f8\uc640 5\ubc88\uc9f8 \uc218\uc5f4\ubfd0\uc774\ubbc0\ub85c \ub2f5\uc73c\ub85c 2\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n\r\n<p>\ub450 \ubc88\uc9f8 \uc608\uc81c\uc5d0\uc11c\ub294 \ub9cc\ub4e4 \uc218 \uc788\ub294 \uc218\uc5f4\ub4e4 \uc911 $[1, -1, 1, 1, 1, -1, 1]$\ub9cc\uc774 \ucd5c\ub300 \ubd80\ubd84\ud569\uc774 3\uc774\uace0, \uc774\ub7ec\ud55c \uc218\uc5f4\uc744 \ub9cc\ub4e4\uae30 \uc704\ud574\uc11c\ub294 $(1, 2)$\uc640 $(4, 3)$\uc744 \ubc18\ub4dc\uc2dc \uc9c0\ub098\uc57c \ud558\ubbc0\ub85c \uacbd\uc6b0\uc758 \uc218\ub294 4\uac00 \ub41c\ub2e4.<\/p>\r\n","original":"1","html_title":"0","problem_lang_tcode":"Korean"},{"problem_id":"22882","problem_lang":"1","title":"Exam","description":"<p>Professor Deokin lectures on algorithms. For the upcoming midterm exam, he decided to add the maximum subarray sum problem taught in his lecture, which is the following problem:<\/p>\r\n\r\n<ul>\r\n\t<li>Given the array&nbsp;$A=[a_1, a_2, \\ldots , a_n]$, compute the value&nbsp;$MSS(A) = \\max_{1 \\leq i \\leq j \\leq n}(\\sum_{k=i}^{j}a_k)$<\/li>\r\n<\/ul>\r\n\r\n<p>Deokin wants to force the students to solve the maximum subarray sum problem by hand. For this, he uses the following procedure.<\/p>\r\n\r\n<ul>\r\n\t<li>Prepare a two-dimensional array of integers of size&nbsp;$N \\times N$.<\/li>\r\n\t<li>Start from the cell&nbsp;$(1, 1)$, and repeatedly move either right or down to reach the cell&nbsp;$(N, N)$. If the current cell is&nbsp;$(i, j)$, he can move right to the cell&nbsp;$(i, j+1)$&nbsp;if&nbsp;$j &lt; N$, or move down to the cell&nbsp;$(i+1, j)$&nbsp;if&nbsp;$i &lt; N$.<\/li>\r\n\t<li>Write a sequence of length&nbsp;$2N-1$&nbsp;which contains the elements of the cells in the order that the cells were visited.<\/li>\r\n<\/ul>\r\n\r\n<p>Professor Deokin wants to add an inside joke to the problem so that the students who paid attention to his lectures can have confidence in their answers. He wants to create a sequence where the value of&nbsp;$MSS(A)$&nbsp;is exactly&nbsp;$K$. Given a two-dimensional array of size&nbsp;$N \\times N$, you need to find the number of different paths in the grid which yield sequences that have a maximum subarray sum value of exactly&nbsp;$K$.<\/p>\r\n","input":"<p>The first line contains two integers&nbsp;$N$&nbsp;denoting the size of the two-dimensional array, and&nbsp;$K$&nbsp;denoting the desired value&nbsp;$(1 \\leq N \\leq 20, -4 \\times 10^{10} \\leq K \\leq 4 \\times 10^{10})$.<\/p>\r\n\r\n<p>The next&nbsp;$N$&nbsp;lines contain&nbsp;$N$&nbsp;integers denoting the values in the two-dimensional array. The&nbsp;$j$-th integer in the&nbsp;$i$-th line denotes the value&nbsp;$A_{i, j}$. All indices used in the array are 1-indexed&nbsp;$(-10^9 \\leq A_{i,j} \\leq 10^9)$.<\/p>\r\n","output":"<p>Output a single integer denoting the number of different paths in a grid which yield a sequence with a maximum subarray sum value of exactly&nbsp;$K$.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"English"}]