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UnSortedArrayPQ.java
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UnSortedArrayPQ.java
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package PriorityQueues;
public class UnSortedArrayPQ implements PriorityQueue {
Array arr[];
int index = 0;
UnSortedArrayPQ()
{
arr = new Array[1];
for(int i=0; i<arr.length;i++)
{
arr[i] = new Array();
}
}
UnSortedArrayPQ(int size)
{
this.arr = new Array[size];
}
class Array{
String V;
int K;
String getVal() {return V;}
int getKey() {return K;}
}
@Override
public int size() {
return arr.length;
}
@Override
public boolean isEmpty() {
if(this.arr[0]==null)
return true;
else
return false;
}
@Override
public double findMin() {
return this.arr[0].K;
}
@Override
public void insert(String V, int K) {
try {
this.arr[index] = new Array();
this.arr[index].V=V;
this.arr[index].K=K;
index++;
if(index==this.arr.length)
{
int newsize = this.arr.length+this.arr.length;
Array[] newArr = new Array[newsize];
Array[] temp = this.arr;
this.arr = newArr;
for(int i=0; i<temp.length;i++)
{
this.arr[i] = new Array();
this.arr[i] = temp[i];
}
}
}
catch(Exception e)
{
System.out.println("This is: "+e.getMessage());
}
}
@Override
public boolean removeMin() {
for(int i=1;i<index;i++)
{
this.arr[i-1] = this.arr[i];
}
this.arr[index-1] = null;
float percentfill = ((float)index/(float)this.arr.length)*100;
if(percentfill<=25.0)
{
int newsize = arr.length - arr.length/2;
Array[] newArr = new Array[newsize];
Array[] temp = this.arr;
this.arr = newArr;
for(int i=0; i<index;i++)
{
this.arr[i] = new Array();
this.arr[i] = temp[i];
}
}
// for(int i=0;i<index-1;i++)
// {
// System.out.println(this.arr[i].V);
// }
if(this.arr[index-1] == null)
{
index--;
return true;
}
return false;
}
}