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$ curl repovive.com/roadmaps/greedy-algorithms/activity-selection/implementation

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$ curl repovive.com/roadmaps/greedy-algorithms/activity-selection/implementation

Repovive

Implementation - Activity Selection | Greedy Algorithms | Repovive

Repovive.

Greedy Algorithms8 sections · 317 units14h total

Open in Course

Implementation

The code

function activitySelection(activities)
 sort activities by end time ascending
 count := 1
 lastEnd := activities[0].end
 for i from 1 to length of activities - 1
 if activities[i].start >= lastEnd then
 count := count + 1
 lastEnd := activities[i].end
 return count

Time: $O(n \log n)$ for sorting, $O(n)$ for scanning. Total: $O(n \log n)$ . Space: $O(1)$ extra (assuming in-place sort).