ICPC 2022 vòng Regional - A: Aqua

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Points: 1.50
Time limit: 3.0s
Memory limit: 512M
Input: stdin
Output: stdout

Problem source:
ICPC 2022 vòng Regional
Problem type
Allowed languages
C, C++, Go, Java, Kotlin, Pascal, PyPy, Python, Rust, Scratch

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Sample Input 1

6 7
 _ _ _ _ _ _ _ 
| |  _ _|  _  |
| | |_ _| |_| |
| |_ _ _|  _ _|
| |  _ _| |   |
| | |_ _| |   |
|_|_ _ _|_|_ _|
6 3 7 2 2 2

Sample Output 1

1

Sample Input 2

2 3
 _ _ _ 
|     |
|_ _ _|
-1 -1

Sample Output 2

3

Sample Input 3

3 3
 _ _ _ 
|  _  |
| | | |
|_|_|_|
-1 1 1

Sample Output 3

1

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