Solution Idea!

#include <bits/stdc++.h>
using namespace std;
class HeapNode_Min { // Tree node of Huffman
public:
//Add data members here.
char d;
unsigned f;
HeapNode_Min *l, *r;
HeapNode_Min(char d, unsigned f = -1)
{
//Complete the body of HeapNode_Min function
this->d = d;
this->f = f ;
this->l = NULL;
this->r = NULL;
}
};
class Analyze { // two heap nodes comparison
public:
bool operator()(HeapNode_Min* l, HeapNode_Min* r)
{
//add return before statement and statement is completed.
return (l->f > r->f); //Complete this statement
}
};
void display_Codes(HeapNode_Min* root, string s) // To print codes of huffman tree from the root.
{
if (!root)
return;
if (root->d != '$')
cout root->d "\t: " s "\n";
display_Codes(root->l, s + "0");
display_Codes(root->r, s + "1"); //Complete this statement by passing arguments
}
void HCodes(char data[], int freq[], int s) // builds a Huffman Tree
{
HeapNode_Min *t,*r, *l ; // top, right, left
priority_queue<HeapNode_Min*, vector<HeapNode_Min*>, Analyze> H_min;
int a=0;
while (a<s){H_min.push(new HeapNode_Min(data[a], freq[a])); ++a;}
while (H_min.size() != 1) {
l = H_min.top(); H_min.pop();
r = H_min.top(); H_min.pop();
t = new HeapNode_Min('$', r->f + l->f);
t->r = r; t->l = l;
H_min.push(t);
}
display_Codes(H_min.top(), "");
}
int main()
{
int frequency[] = { 3, 6, 11, 14, 18, 25 }; char alphabet[] = { 'A', 'L', 'O', 'R', 'T', 'Y' };
//Complete this statement by passing data type to both sizeof operators
int size_of = sizeof(alphabet) / sizeof(*alphabet);
cout"Alphabet"":""Huffman Code\n";
cout"--------------------------------\n";
//Call Huffman_Codes function.
HCodes(alphabet, frequency, size_of);
return 0;
}