Last active
November 13, 2016 19:41
-
-
Save mvalipour/2fae0d841fee88a6eae689e0ea21d44e to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| function solution(input) { | |
| if (input.length === 0) { | |
| return []; | |
| } | |
| // sort by first element of each interval | |
| // O(n log n) | |
| intervals = input.slice(0); | |
| intervals.sort(([a], [b]) => a - b); | |
| // sweep through intervals and chain them together | |
| // if chain broken, flush into results and continue | |
| // O(n) | |
| var result = []; | |
| var [start, end] = intervals.shift(); | |
| intervals.forEach(([s, e]) => { | |
| if (s <= end) { | |
| end = Math.max(e, end); | |
| } else { | |
| result.push([start, end]); | |
| [start, end] = [s, e]; | |
| } | |
| }); | |
| // the last chain would never be broken, so flush it! | |
| result.push([start, end]); | |
| return result; | |
| } | |
| var tests = [ | |
| [[2, 5], [1, 10], [11, 15], [1, 3]], | |
| [], | |
| [[4, 5], [1, 2], [2, 3]], | |
| [[1, 10], [2, 2]] | |
| ]; | |
| tests.forEach(t => console.log(t, '=>', solution(t))); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment