2020 East Central NA Regional Contest

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2021-03-06 10:00 AKST

2020 East Central NA Regional Contest

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2021-03-06 15:00 AKST
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Problem B
Kinky Word Search

You’re probably familiar with regular word searches, where you’re presented with a grid of letters and a word to find. The word can be in a straight line horizontally, vertically, or diagonally (and perhaps backwards in any of those directions). For example, here is a grid of letters:

\includegraphics[width=0.25\textwidth ]{kinky1.png}
Figure 1: A word search grid

The word “JAVA” can be found going from the bottom right corner diagonally upwards.

In a kinky word search  the path that spells out the word can have one or more “kinks” – places where the path changes direction. For example, in the given grid you can spell the word “PYTHON” with $3$ kinks (one each at the T, H and O):

\includegraphics[width=0.25\textwidth ]{kinky2.png}
Figure 2: A kinky spelling of “PYTHON”

Adding kinks allows letters to be reused – the word “CPLUSPLUS” can be found in the upper right corner of the grid (with $5$ kinks). However you cannot stay on a letter twice in a row, so you cannot spell the word “HASKELL” in this grid (though you can find at least $11$ more common programming languages). Your task is to see if the spelling of a word with a certain number of kinks is possible or not.

Input

Input begins with a line containing two positive integers $r$ and $c$ ($r, c \leq 10)$, the number of rows and columns in the grid. After this are $r$ rows of $c$ uppercase characters. Letters are separated by a space. After the grid are two lines: The first line is an integer $k$, the number of kinks. The second line contains an uppercase word to look for, with maximum length $100$.

Output

Output either the word Yes if it is possible to spell the given word with exactly $k$ kinks on the grid provided, or No if it is not.

Sample Input 1 Sample Output 1
5 5
L M E L C
C A K U P
D O V S Y
R N L A T
P G O H J
0
JAVA
Yes
Sample Input 2 Sample Output 2
5 5
L M E L C
C A K U P
D O V S Y
R N L A T
P G O H J
3
PYTHON
Yes
Sample Input 3 Sample Output 3
5 5
L M E L C
C A K U P
D O V S Y
R N L A T
P G O H J
4
PYTHON
No