CF538D.Weird Chess
普及/提高-
通过率：0%
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题目描述
The first line contains a single integer n ( 1<=n<=50 ).
The next n lines contain n characters each describing the position offered by Igor. The j -th character of the i -th string can have the following values:
- o — in this case the field (i,j) is occupied by a piece and the field may or may not be attacked by some other piece;
- x — in this case field (i,j) is attacked by some piece;
- . — in this case field (i,j) isn't attacked by any piece.
It is guaranteed that there is at least one piece on the board.
输入格式
If there is a valid set of moves, in the first line print a single word 'YES' (without the quotes). Next, print the description of the set of moves of a piece in the form of a (2n−1)×(2n−1) board, the center of the board has a piece and symbols 'x' mark cells that are attacked by it, in a format similar to the input. See examples of the output for a full understanding of the format. If there are several possible answers, print any of them.
If a valid set of moves does not exist, print a single word 'NO'.
输出格式
In the first sample test the piece is a usual chess rook, and in the second sample test the piece is a usual chess knight.
输入输出样例
输入#1
5 oxxxx x...x x...x x...x xxxxo
输出#1
YES ....x.... ....x.... ....x.... ....x.... xxxxoxxxx ....x.... ....x.... ....x.... ....x....
输入#2
6 .x.x.. x.x.x. .xo..x x..ox. .x.x.x ..x.x.
输出#2
YES ........... ........... ........... ....x.x.... ...x...x... .....o..... ...x...x... ....x.x.... ........... ........... ...........
输入#3
3 o.x oxx o.x
输出#3
NO
说明/提示
In the first sample test the piece is a usual chess rook, and in the second sample test the piece is a usual chess knight.