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package correct_java_programs;
import java.util.*;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author derricklin
*/
public class HANOI {
// default start=1, end=3
public static List<Pair<Integer,Integer>> hanoi(int height, int start, int end) {
ArrayList<Pair<Integer,Integer>> steps = new ArrayList<Pair<Integer,Integer>>();
if (height > 0) {
PriorityQueue<Integer> crap_set = new PriorityQueue<Integer>();
crap_set.add(1);
crap_set.add(2);
crap_set.add(3);
crap_set.remove(start);
crap_set.remove(end);
int helper = crap_set.poll();
steps.addAll(hanoi(height-1, start, helper));
steps.add(new Pair<Integer,Integer>(start, end));
steps.addAll(hanoi(height-1, helper, end));
}
return steps;
}
public static class Pair<F, S> {
private F first; //first member of pair
private S second; //second member of pair
public Pair(F first, S second) {
this.first = first;
this.second = second;
}
public void setFirst(F first) {
this.first = first;
}
public void setSecond(S second) {
this.second = second;
}
public F getFirst() {
return first;
}
public S getSecond() {
return second;
}
@Override
public String toString() {
return "(" + String.valueOf(first) + ", " + String.valueOf(second) + ")";
}
}
}
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