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# Perl Weekly Challenge Club - 127
This is my first time submitting! I had a lot of fun and it was a good excuse
to work on my Perl. I spend most of my time working with Javascript, so I
started out by writing a solution Javascript.
## Task 1 > Disjoint Sets
You are given two sets with unique integers.
Write a script to figure out if they are disjoint.
The two sets are disjoint if they don't have any common members
### EXAMPLE
**Input:**
```javascript
const s1 = [1, 2, 5, 3, 4];
const s2 = [4, 6, 7, 8, 9];
```
**Output:** `0` as the given sets have common member `4`.
**Input:**
```javascript
const s1 = [1, 3, 5, 7, 9];
const s2 = [0, 2, 4, 6, 8];
```
**Output:** `1` as the given two sets do no have a common member.
### SOLUTION
```javascript
function isDisjoint(set1 = [], set2 = []) {
const testSet = [...set1]; // shallow copy of the first set
let disjoint = true; // trust, but verify
while (disjoint && testSet.length) {
const test = testSet.pop();
if (set2.includes(test)) disjoint = false;
}
return disjoint;
}
```
### ch-1.js
Running `./ch-1.js` tests our solution against the following test cases,
printing `Passed` or `Failed` to the console:
#### Case 1:
```javascript
1,2,5,3,4
4,6,7,8,9
0 // false, 4 is not unique
```
#### Case 2:
```javascript
1,3,5,7,9
0,2,4,6,8
1
```
#### Case 3:
```javascript
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
2
1 // Technically, the sets are still disjoint
```
#### Case 4:
```javascript
😺,😸,😹,😻,😼,😽
😽,🙀,😿,😾
0 // False
```
#### Case 5:
```javascript
🙂,🙃,😉,😌,😍,🥰,😘,😗,😙,😚,😋
🤤,😪,😵,🤐,🥴,🤢,🤮,🤧,😷,🤒,🤕
1 // True
```
### Custom Tests
`./ch-1.js` will optionally accept a path to a test file or directory of test
files (ie: `$ ./ch-1.js ./local_test.txt`). Test files must include no more than
2 lines of comma separated values with the last line being either `0` for tests
that should fail or `1` for tests that should pass. Lines beginning with `#`
will be ignored.
## Task 2 > Conflict Intervals
You are given a list of intervals.
Write a script to find out if the current interval conflicts with any of the
previous intervals.
### EXAMPLE
**Input:**
```javascript
const intervals = [[1, 4], [3, 5], [6, 8], [12, 13], [3, 20]];
```
**Output:**
```javascript
[[3, 5], [3, 20]]
```
- The 1st interval `[1, 4]` does not have any previous intervals to compare
with, so skip it.
- The 2nd interval `[3, 5]` does conflict with previous interval `[1, 4]`.
- The 3rd interval `[6, 8]` does not conflict with any of the previous
intervals `[1, 4]` and `[3, 5]`, so skip it.
- The 4th interval `[12, 13]` again does not conflict with any previous
intervals `[1, 4]`, `[3, 5]`, or `[6, 8]` so skip it.
- The 5th interval `[3, 20]` conflicts with the first interval `[1, 4]`.
**Input:**
```javascript
const intervals = [[3, 4], [5, 7], [6, 9], [10, 12], [13, 15]];
```
**Output:**
```javascript
[[6, 9]];
```
### SOLUTION
```javascript
function findConflictIntervals(intervals = [[]]) {
if (!Array.isArray(intervals)) return 'Input must be an 2-dimensional array';
const [conflicts, ] = intervals.reduce(([conflicts, passed], [ a1, a2 ]) => {
const start = a1 < a2 ? a1: a2;
const end = start === a1 ? a2: a1;
if (passed.length === 0) {
passed.push([start, end]);
return [conflicts, passed];
}
const conflict = passed.reduce((isConflict, [ b1, b2 ]) => {
if (
(start >= b1 && start <= b2) ||
(end >= b1 && end <= b2) ||
(start <= b1 && end >= b2)
) {
return true;
};
return isConflict;
}, false);
if (conflict) {
conflicts.push([start, end]);
} else {
passed.push([start, end]);
}
return [conflicts, passed]
}, [[], []]);
return conflicts;
}
```
### ch-2.js
Running `./ch-2.js` tests our solution against the folowing test cases,
printing `Passed` or `Failed` to the console:
#### Case 1:
```javascript
{
input: [[1, 4], [3, 5], [6, 8], [12, 13], [3, 20]],
output: [[3, 5], [3, 20]]
}
```
#### Case 2:
```javascript
{
input: [[3, 4], [5, 7], [6, 9], [10, 12], [13, 15]],
output: [[6, 9]]
}
```
#### Case 3:
```javascript
{
input: [[1.14, 1.56], [2.32, 3], [1.5, 1.72]],
output: [[1.5, 1.72]]
}
```
#### Case 4:
```javascript
{
input: [[-234, 10], [-1.12, 11], [11, 111111]],
output: [[-1.12, 11]]
}
```
#### Case 5:
```javascript
{
input: [[-1, -1], [1, 3], [3.1, 4], [4, 5]],
output: [[4, 5]]
}
```
### Custom Tests
`./ch-2.js` will optionally accept a path to a test file or directory of test
files (ie: `$ ./ch-2.js ./local_test.json`). Test files must be properly
formatted JSON with both an `"input"` and an `"output"` key.
#### Example Test
```json
{
"input": [
[
1,
3
],
[
2,
4
],
[
6,
7
]
],
"output": [
[
2,
4
]
]
}
```
|
