哈夫曼树

Posted 2022-12-10 梦西空

#include<bits/stdc++.h>
using namespace std;//哈夫曼树及其编码 
const int MAX=10;
const int MAXF=10000;

//哈夫曼树 
typedef struct
	int weight;
	int lchild,rchild,parent;
HFMtree;

//哈夫曼编码 
typedef struct
	int weight;
	int data[MAX];
	int start;//start为哈夫曼编码初始位置 
HFMcode;


//构建哈夫曼树a,用b储存哈夫曼编码,c为权值,n为结点数 
void HFMansf(HFMtree *(*a),HFMcode *(*b),int *c,int n)

	if(n<=1)
	return;
	int m=2*n-1;//结点总数 
	int xb1,xb2;
	int i,j;
	*a=new HFMtree [m];
	for(i=0;i<n;i++)
		(*a)[i].weight=c[i];
		(*a)[i].lchild=(*a)[i].rchild=(*a)[i].parent=-1;
	//初始化叶子结点

	for(i=n;i<m;i++)
		(*a)[i].lchild=(*a)[i].rchild=(*a)[i].parent=-1;
	
	int min1,min2; 
	for(i=n;i<m;i++)
		min1=min2=MAXF;
		for(j=0;j<i;j++)//找到两个权值最小的结点 
			if((*a+j)->parent==-1&&(*a+j)->weight<min1)
				min2=min1;xb2=xb1;min1=(*a+j)->weight;
				xb1=j;
			
			else if((*a+j)->parent==-1&&(*a+j)->weight<min2)
				min2=(*a+j)->weight;xb2=j;
			
		
		(*a+xb1)->parent=(*a+xb2)->parent=i;
	    (*a+i)->weight=min1+min2; 
		(*a+i)->lchild=xb1;(*a+i)->rchild=xb2;
	
	*b=new HFMcode [n];
	int start;
	int f,d;
	for(i=0;i<n;i++)
		f=(*a+i)->parent;
		(*b+i)->weight=c[i];
		d=i;
		start=n;
		while(f!=-1)
		    if((*a+f)->lchild==d)
			(*b+i)->data[--start]=0;
		    else 
		    (*b+i)->data[--start]=1;
		    d=f;f=(*a+d)->parent;
		
		(*b+i)->start=start;
	

 
 
int main()

	HFMcode *b;HFMtree *a;int n=6;
	int c[]=7,8,4,3,2,6;
	HFMansf(&a,&b,c,n);
	int i,j;
	for(i=0;i<n;i++)
	
		cout<<"权值:"<<(b+i)->weight<<'\\n'<<"编码:";
		for(j=(b+i)->start;j<n;j++)
		cout<<(b+i)->data[j];
		cout<<endl;