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ActivitySelection.java
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ActivitySelection.java
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package greedy.activityselection;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
public class ActivitySelection {
public static void main(String[] args){
// create activity instance
Activity a1 = new Activity("a1",1,4);
Activity a2 = new Activity("a2",3,5);
Activity a3 = new Activity("a3",0,6);
Activity a4 = new Activity("a4",5,7);
Activity a5 = new Activity("a5",3,9);
Activity a6 = new Activity("a6",5,9);
Activity a7 = new Activity("a7",6,10);
Activity a8 = new Activity("a8",7,11);
Activity a9 = new Activity("a9",8,12);
Activity a10 = new Activity("a10",2,14);
Activity a11 = new Activity("a11",12,16);
// add activities to the list
List<Activity> activityList = new ArrayList<>();
activityList.add(a1);
activityList.add(a2);
activityList.add(a3);
activityList.add(a4);
activityList.add(a5);
activityList.add(a6);
activityList.add(a7);
activityList.add(a8);
activityList.add(a9);
activityList.add(a10);
activityList.add(a11);
// The total time that we have
int n = 16;
// Representing activities
System.out.println("\n############# List of activities #############\n");
System.out.println("activity\t start \t finish\t");
for(var activity: activityList) {
System.out.println(activity.name +"\t\t\t "+ activity.start +"\t\t "+ activity.finish+"\t");
}
// Representing a result of activity selection algorithm
System.out.println("\n############# Result #############\n");
List<Activity> ac = greedyActivitySelector(activityList);
System.out.println(activityList.size());
System.out.print("Activity\t s\t f\t|");
for (int i = 0; i< n;i++) System.out.print("=");
System.out.println("\n-------------------------------------");
for(var activity: ac) {
System.out.print(activity.name +"\t\t\t "+ activity.start +"\t "+ activity.finish+"\t|");
int duration = activity.finish - activity.start;
for (int j = 0; j < activity.start; j++){
System.out.print(" ");
}
for (int i = 0; i < duration; i++ ){
System.out.print("=");
}
System.out.println();
}
}
public static List<Activity> greedyActivitySelector(List<Activity> activities){
activities.sort(Comparator.comparingInt(i->i.finish));
List<Activity> result = new ArrayList<>();
result.add(activities.get(0));
int k = 0;
for (int m = 1; m < activities.size(); m++) {
int sm = activities.get(m).start;
int fk = activities.get(k).finish;
if( sm >= fk ){
result.add(activities.get(m));
k = m;
}
}
return result;
}
private static class Activity{
private final String name;
private final int start;
private final int finish;
private Activity(String name, int start, int finish) {
this.name = name;
this.start = start;
this.finish = finish;
}
}
}