haffmantree

#include <cstdio>
#include <iostream>
#include <malloc.h>
#include <cstring>
using namespace std;
#define INF 0xffffff
typedef struct
{
    unsigned int weight;
    unsigned int parent,lchild,rchild;
}HTNode ,*HuffmanTree;
typedef char * * HuffmanCode;
void HuffmanCoding(HuffmanTree &HT,HuffmanCode &HC, int *w,int n)
{
    int i,j,m,s1,s2,start;
    char *cd;
    unsigned int c,f;
    if(n<=1)return ;
    m=2*n-1;
    HT=(HuffmanTree)malloc((m+1)*sizeof(HTNode));
    for(i=1;i<=n;++i)
    {
        HT[i].weight=w[i-1];
        HT[i].parent=0;
        HT[i].lchild=0;
        HT[i].rchild=0;
    }
    for(i=n+1;i<=m;i++)
    {
        HT[i].weight=0;
        HT[i].parent=0;
        HT[i].lchild=0;
        HT[i].rchild=0;
    }
    int min1=INF,min2=INF;
    for(i=n+1;i<=m;++i)
    {
       for(j=1;j<=i-1;j++)
       {
           if(HT[j].parent==0&&HT[j].weight<min1)
           {
               min1=HT[j].weight;
               s1=j;
           }
       }
       for(j=1;j<=i-1;j++)
       {
           if(HT[j].parent==0&&HT[j].weight<min2&&s1!=j)
           {
               min2=HT[j].weight;
               s2=j;
           }
       }
       HT[s1].parent=i;
       HT[s2].parent=i;
       HT[i].lchild=s1;
       HT[i].rchild=s2;
       HT[i].weight=HT[s1].weight+HT[s2].weight;
       min1=INF;
       min2=INF;
    }
    for(i=1;i<=m;i++)
    {
        printf("%5d %5d %5d %5d\n",HT[i].weight,HT[i].lchild,HT[i].rchild,HT[i].parent);
    }
    HC=(HuffmanCode)malloc((n+1)*sizeof(char *));
    cd=(char*)malloc(n*sizeof(char));
    cd[n-1]='\0';
    for(i=1;i<=n;i++)
    {
        start=n-1;
        for(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';
        }
        HC[i]=(char*)malloc((n-start)*sizeof(char));
        strcpy(HC[i],&cd[start]);
        printf("%d 's haffmancode is :%s\n",w[i-1],HC[i]);
    }
    free(cd);
}
int main()
{
    HuffmanTree HT;
    HuffmanCode HC;
    int w[100]={0},n,i;
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
        scanf("%d",&w[i]);
    }
    HuffmanCoding(HT,HC,w,n);
}