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Note: This challenge was underspecified and bad, and as such I would not encourage answering it in the future. Challenge You will be given a single 2D boolean array $M$. You may take its dimensi...

1 answer · posted 3y ago by rak1507‭ · edited 3y ago by rak1507‭

Question code-golf boolean

#2: Post edited by

rak1507‭ · 2021-05-30T20:32:20Z (almost 3 years ago)

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# Challenge
You will be given a single 2D boolean array \$M\$. You may take its dimensions as a separate argument if needed.
Find the longest parallel lines in the matrix.
Parallel lines can be vertical, horizontal, or diagonal, and there can't be a 1 anywhere between the two lines. (Imagine 0s are air, and the 1s are solid, the two lines have to be able to 'see' each other)
For example, in the matrix
```
0 1 1 1 0 0
0 0 0 0 0 0
0 1 1 1 1 0
0 0 1 1 0 0
0 0 0 0 0 0
```
the longest parallel line is length 3.
If there are no parallel lines, output 0.
# Test Cases
```
I:
0 0 0 1
0 0 0 0
0 0 0 0
0 1 0 0
O: 0
I:
0 0 1 0 1
0 1 0 1 0
1 0 1 0 0
O: 3
I:
0 0 1 0 1
0 0 1 0 1
0 0 1 1 1
0 0 1 0 1
0 0 1 0 1
O: 2
(The 1 in the middle is obstructing the line of sight)
```

# Note:
This challenge was underspecified and bad, and as such I would not encourage answering it in the future.
# Challenge
You will be given a single 2D boolean array \$M\$. You may take its dimensions as a separate argument if needed.
Find the longest parallel lines in the matrix.
Parallel lines can be vertical, horizontal, or diagonal, and there can't be a 1 anywhere between the two lines. (Imagine 0s are air, and the 1s are solid, the two lines have to be able to 'see' each other)
For example, in the matrix
```
0 1 1 1 0 0
0 0 0 0 0 0
0 1 1 1 1 0
0 0 1 1 0 0
0 0 0 0 0 0
```
the longest parallel line is length 3.
If there are no parallel lines, output 0.
# Test Cases
```
I:
0 0 0 1
0 0 0 0
0 0 0 0
0 1 0 0
O: 0
I:
0 0 1 0 1
0 1 0 1 0
1 0 1 0 0
O: 3
I:
0 0 1 0 1
0 0 1 0 1
0 0 1 1 1
0 0 1 0 1
0 0 1 0 1
O: 2
(The 1 in the middle is obstructing the line of sight)
```

#1: Initial revision by

rak1507‭ · 2021-02-02T12:43:15Z (about 3 years ago)

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Longest parallel lines

# Challenge
You will be given a single 2D boolean array \$M\$. You may take its dimensions as a separate argument if needed.

Find the longest parallel lines in the matrix.
Parallel lines can be vertical, horizontal, or diagonal, and there can't be a 1 anywhere between the two lines. (Imagine 0s are air, and the 1s are solid, the two lines have to be able to 'see' each other)
For example, in the matrix
```
0 1 1 1 0 0
0 0 0 0 0 0
0 1 1 1 1 0 
0 0 1 1 0 0
0 0 0 0 0 0
```
the longest parallel line is length 3.
If there are no parallel lines, output 0.

# Test Cases
```
I:
0 0 0 1
0 0 0 0
0 0 0 0
0 1 0 0
O: 0
I:
0 0 1 0 1
0 1 0 1 0
1 0 1 0 0
O: 3
I:
0 0 1 0 1
0 0 1 0 1
0 0 1 1 1
0 0 1 0 1
0 0 1 0 1
O: 2
(The 1 in the middle is obstructing the line of sight)
```

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