数据结构哈夫曼树的实现

s1=i;
}
}
for(j=1;j<=n;j++){
if((HT[s2].weight>HT[j].weight)&&(!HT[j].parent)&&(s1!=j))
s2=j;
}
}
void HuffmanCoding(HuffmanCode HC[], int *w, int n) { // w存放n个字符的权值(均>0)，构造哈夫曼树HT，//并求出n个字符的哈夫曼编码HC
HT[i].lchild = s1;
HT[i].rchild = s2;
HT[i].weight = HT[s1].weight + HT[s2].weight;
HT[i].ch=j;
}
//-----从叶子到根逆向求每个字符的哈夫曼编码
cd=(char *)malloc(n*sizeof(char));
int i, j;
char *cd;
int p;
int cdlen;
int start;
if (n<=1) return;
m = 2 * n - 1;
HT = (HuffmanTree)malloc((m+1) * sizeof(HTNode)); // 0号单元未用
for (i=1; i<=n; i++) {//初始化
HT[i].rchild=0;
HT[i].ch=0;
}
for (j=1,i=n+1; i<=m; i++,j++) { //建哈夫曼树//在HT[1..i-1]中选择parent为0且weight最小的两个结点，//其序号分别为s1和s2
Select(i-1);
HT[s1].parent = i;
HT[s2].parent = i;
printf("输入%d个结点的权值\n",n);
for(i=0;i<n;i++){
scanf("%d",&w[i]);
}
HuffmanCoding(HC,w,n);
puts("\n各结点的哈夫曼编码为:");
for(i=1;i<=n;i++){
c=(char)i+64;
cout<<c<<'('<<w[i-1]<<')'<<HC[i]<<endl;
cd[n-1]='\0';
for(i=1;i<=n;++i){
start=n-1;
HT[i].ch=i;
for(unsigned int c=i,f=HT[i].parent;f!=0;c=f,f=HT[f].parent)
if(HT[f].lchild==c) cd[--start]='0';
else cd[--start]='1';
HT[i].weight=w[i-1];
HT[i].parent=0;
HT[i].lchild=0;
HT[i].rchild=0;
HT[i].ch=0;
}
for (i=n+1; i<=m; i++) {//初始化
HT[i].weight=0;
HT[i].parent=0;
HT[i].lchild=0;
cout<<HT[r].lchild<<"<--"<<r<<"-->"<<HT[r].rchild<<endl;
}
}
void trans(){//译码
int i=m;
char a;
printf("输入0/1进行译码，输入'!'进行编码");
cin>>a;
while(a=='0'||a=='1'){
if(a=='0')
if(!HT[i].parent){
s1 = i;break;
}
}
for(j=i+1;j<=n;j++){
if(!HT[j].parent){
s2 = j;break;
}
}
for(i=1;i<=n;i++){
if((HT[s1].weight>HT[i].weight)&&(!HT[i].parent)&&(s2!=i)){
HC[i]=(char *)malloc((n-start)*sizeof(char));
strcpy(HC[i],&cd[start]);
}
free(cd);
}
void PTree(int n){//打印树的结构
int r=2*n-1;
printf("树的结构为（0表示无孩子）：\n");
for(;r>0;r--){
}HTNode,*HuffmanTree; //动态分配数组存储哈夫曼树
typedef char *HuffmanCode; //动态分配数组存储哈夫曼编码表
int m,s1,s2; HuffmanTree HT;
void Select(int n){ //选择两个权值最小的结点
int i,j;
for(i=1;i<=n;i++){
#include<string>
#include<stdlib.h>
#include<stdio.h>
#include<iostream>
uห้องสมุดไป่ตู้ing namespace std;
typedef struct {
unsigned int weight;
unsigned int parent,lchild,rchild,ch;
void main() {
HuffmanTree HT;
HuffmanCode *HC;
int *w,n,i,j;
char b,c;puts("输入结点数:");
scanf("%d",&n);
HC=(HuffmanCode *)malloc(n*sizeof(HuffmanCode));
w=(int *)malloc(n*sizeof(int));
}
PTree(n);
printf("\n各结点的哈夫曼译码为:\n");
trans();
cout<<"请输入源码：";//从trans函数返回进行编码
cin>>b;
j=(int)(b-64);
while(j){
cout<<HC[j];
cin>>b;
j=(int)(b-64);
}
cout<<endl;
system("pause");
}
i=HT[i].lchild;
else if(a=='1')
i=HT[i].rchild;
if(HT[i].lchild==0){
cout<<(char)(HT[i].ch+64);i=m;
}
else if(a=='!')
return;//当接收到的输入为"!"时返回主函数进行编码
cin>>a;
}
}