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Copy pathHuffmanCoding.java
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113 lines (62 loc) · 1.5 KB
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import java.util.PriorityQueue;
import java.util.Scanner;
import java.util.Comparator;
class HuffmanNode {
int data;
char c;
HuffmanNode left;
HuffmanNode right;
}
class MyComparator implements Comparator<HuffmanNode> {
public int compare(HuffmanNode x, HuffmanNode y)
{
return x.data - y.data;
}
}
public class Huffman {
public static void printCode(HuffmanNode root, String s)
{
if (root.left
== null
&& root.right
== null
&& Character.isLetter(root.c)) {
System.out.println(root.c + ":" + s);
return;
}
printCode(root.left, s + "0");
printCode(root.right, s + "1");
}
public static void main(String[] args)
{
Scanner s = new Scanner(System.in);
int n = 6;
char[] charArray = { 'a', 'b', 'c', 'd', 'e', 'f' };
int[] charfreq = { 5, 9, 12, 13, 16, 45 };
PriorityQueue<HuffmanNode> q
= new PriorityQueue<HuffmanNode>(n, new MyComparator());
for (int i = 0; i < n; i++) {
HuffmanNode hn = new HuffmanNode();
hn.c = charArray[i];
hn.data = charfreq[i];
hn.left = null;
hn.right = null;
q.add(hn);
}
HuffmanNode root = null;
while (q.size() > 1) {
HuffmanNode x = q.peek();
q.poll();
HuffmanNode y = q.peek();
q.poll();
HuffmanNode f = new HuffmanNode();
f.data = x.data + y.data;
f.c = '-';
f.left = x;
f.right = y;
root = f;
q.add(f);
}
printCode(root, "");
}
}