重点单词：

piece n.个，块，片，零件，部分，点；

verify v.核实，查证，证明；

configuration n.布局，构造，配置；

identical adj.完全相同的，同一的；

出处：https://acs.jxnu.edu.cn/problem/NOIOPJCH0205200

Solitaire

 5000ms  1000K

描述：

Solitaire is a game played on a chessboard 8x8. The rows and columns of the chessboard are numbered from 1 to 8, from the top to the bottom and from left to right respectively. 跳棋是一个在8*8的棋盘上玩的游戏。在棋盘上，每一行，每一列都分别从左到右，从上到下被标上了0--8的数字序号。

There are four identical pieces on the board. In one move it is allowed to: 棋盘上有四块完全相同的棋子。在一步移动中它允许作如下操作：

• move a piece to an empty neighboring field (up, down, left or right),
• 移动一个棋子到相邻的空棋盘点；
• jump over one neighboring piece to an empty field (up, down, left or right).
• 跳过相邻的棋子到空棋盘点；

There are 4 moves allowed for each piece in the configuration shown above. As an example let's consider a piece placed in the row 4, column 4. It can be moved one row up, two rows down, one column left or two columns right.
Write a program that:

在上面所示的配置中，每个棋子允许上述4种移动。作为一个例子，让我们考虑放置在行4、列4中的一个片段。它可以向上移动一行、向下移动两行、向左移动一列或向右移动两列。

编写一个程序：

• reads two chessboard configurations from the standard input,
• verifies whether the second one is reachable from the first one in at most 8 moves,
• writes the result to the standard output.

• 从标准输入读取两个棋盘配置，

•  

  验证在最多8个移动中是否可以从第一个到达第二个，

•  

  将结果写入标准输出。

输入：

Each of two input lines contains 8 integers a1, a2, ..., a8 separated by single spaces and describes one configuration of pieces on the chessboard. Integers a2j-1 and a2j (1 <= j <= 4) describe the position of one piece -- the row number and the column number respectively.

输出：

The output should contain one word YES if a configuration described in the second input line is reachable from the configuration described in the first input line in at most 8 moves, or one word NO otherwise.

样例输入：

4 4 4 5 5 4 6 5
2 4 3 3 3 6 4 6

样例输出：

YES

注释：

Source: Southwestern Europe 2002