CF1136C.Nastya Is Transposing Matrices
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题目描述
Nastya came to her informatics lesson, and her teacher who is, by the way, a little bit famous here gave her the following task.
Two matrices A and B are given, each of them has size n×m. Nastya can perform the following operation to matrix A unlimited number of times:
- take any square square submatrix of A and transpose it (i.e. the element of the submatrix which was in the i-th row and j-th column of the submatrix will be in the j-th row and i-th column after transposing, and the transposed submatrix itself will keep its place in the matrix A).
Nastya's task is to check whether it is possible to transform the matrix A to the matrix B.
Example of the operation
As it may require a lot of operations, you are asked to answer this question for Nastya.
A square submatrix of matrix M is a matrix which consist of all elements which comes from one of the rows with indeces x,x+1,…,x+k−1 of matrix M and comes from one of the columns with indeces y,y+1,…,y+k−1 of matrix M. k is the size of square submatrix. In other words, square submatrix is the set of elements of source matrix which form a solid square (i.e. without holes).
纳斯塔娅来到她的信息学课堂,而她的老师——顺便提一下,这位老师在此地小有名气——给她布置了如下任务。
给定两个 n×m 的矩阵 A 和 B。纳斯塔娅可以对矩阵 A 执行以下操作任意多次:
- 任取 A 的一个方阵子矩阵并将其转置(即:该子矩阵中原本位于子矩阵第 i 行第 j 列的元素,在转置后将位于子矩阵第 j 行第 i 列;且该转置后的子矩阵在矩阵 A 中所处的位置保持不变)。
纳斯塔娅的任务是判断:能否通过若干次上述操作,将矩阵 A 变为矩阵 B。
操作示例
由于可能需要执行大量操作,你需要替纳斯塔娅回答这一问题。
矩阵 M 的一个方阵子矩阵,是指由 M 中某连续 k 行(行索引为 x,x+1,…,x+k−1)与某连续 k 列(列索引为 y,y+1,…,y+k−1)所共同确定的全部元素构成的矩阵。其中 k 称为该方阵子矩阵的大小。换言之,方阵子矩阵是原矩阵中一组构成完整实心正方形(即无空洞)的元素集合。
输入格式
The first line contains two integers n and m separated by space (1≤n,m≤500) — the numbers of rows and columns in A and B respectively.
Each of the next n lines contains m integers, the j-th number in the i-th of these lines denotes the j-th element of the i-th row of the matrix A (1≤Aij≤109).
Each of the next n lines contains m integers, the j-th number in the i-th of these lines denotes the j-th element of the i-th row of the matrix B (1≤Bij≤109).
第一行包含两个由空格分隔的整数 n 和 m(1≤n,m≤500),分别表示矩阵 A 和 B 的行数与列数。
接下来的 n 行中,每行包含 m 个整数;其中第 i 行中的第 j 个数表示矩阵 A 第 i 行的第 j 个元素(1≤Aij≤109)。
再接下来的 n 行中,每行包含 m 个整数;其中第 i 行中的第 j 个数表示矩阵 B 第 i 行的第 j 个元素(1≤Bij≤109)。
输出格式
Print "YES" (without quotes) if it is possible to transform A to B and "NO" (without quotes) otherwise.
You can print each letter in any case (upper or lower).
如果可以将 A 变换为 B,则输出 "YES"(不带引号);否则输出 "NO"(不带引号)。
您可以以任意大小写(大写或小写)输出每个字母。
输入输出样例
输入#1
2 2 1 1 6 1 1 6 1 1
输出#1
YES
输入#2
2 2 4 4 4 5 5 4 4 4
输出#2
NO
输入#3
3 3 1 2 3 4 5 6 7 8 9 1 4 7 2 5 6 3 8 9
输出#3
YES
说明/提示
Consider the third example. The matrix A initially looks as follows.
\\begin{bmatrix} 1 & 2 & 3\\\\ 4 & 5 & 6\\\\ 7 & 8 & 9 \\end{bmatrix}Then we choose the whole matrix as transposed submatrix and it becomes
\\begin{bmatrix} 1 & 4 & 7\\\\ 2 & 5 & 8\\\\ 3 & 6 & 9 \\end{bmatrix}Then we transpose the submatrix with corners in cells (2,2) and (3,3).
\\begin{bmatrix} 1 & 4 & 7\\\\ 2 & \\textbf{5} & \\textbf{8}\\\\ 3 & \\textbf{6} & \\textbf{9} \\end{bmatrix}So matrix becomes
\\begin{bmatrix} 1 & 4 & 7\\\\ 2 & 5 & 6\\\\ 3 & 8 & 9 \\end{bmatrix}and it is B.
考虑第三个例子。矩阵 A 最初如下所示:
147258369
接着,我们选择整个矩阵作为被转置的子矩阵,它变为:
123456789
然后,我们对以单元格 (2,2) 和 (3,3) 为对角顶点的子矩阵进行转置:
123456789
因此,矩阵变为:
123458769
该矩阵即为 B。
输入解题思路,AI测评打分。不知道怎么写?