// Radix.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"

#include<iostream>
#include<string>
#include<malloc.h>
using namespace std;

#define maxr 10
#define maxd 8

//定义到外面，方便DispLink使用，或者把DispLink作为Radix的内置函数
typedef struct link
{
    char data[maxd];
    link *next;
}RecType;

class Radix
{
    RecType *p;
public:
    Radix(){ p = NULL; }
    Radix(char *a[], int n);
    ~Radix(){}
    friend void DispLink(Radix r);
    void RadixSort(int r, int d);
};

void DispLink(Radix r)
{
    //而直接使用r.p，破坏了原有数据，应该使用临时变量指针保留r的现场
    RecType *t = r.p;
    while (t != NULL)
    {
        cout << t->data << " ";
        t = t->next;
    }
    cout << endl;
}
void Radix::RadixSort(int r, int d)
{
    RecType *head[maxr], *tail[maxr], *t;
    int i, j, k;
    for (i = d - 1; i >= 0; i--)
    {
        for (j = 0; j < r; j++)
            head[j] = tail[j] = NULL;
        while (p != NULL)
        {
            k = p->data[i] - '0';
            if (head[k] == NULL)
            {
                head[k] = p;
                tail[k] = p;
            }
            else
            {
                tail[k]->next = p;
                tail[k] = p;
            }
            p = p->next;
        }
        p = NULL;
        for (j = 0; j < r; j++)
        {
            if (head[j] != NULL)
            {
                if (p == NULL)
                {
                    p = head[j];
                    t = tail[j];
                }
                else
                {
                    t->next = head[j];
                    t = tail[j];
                }
            }
        }
        t->next = NULL;//缺少该语句，导致死循环
        cout << "order by " << d - i - 1 << " bit ";
        DispLink(*this);
    }
}

Radix::Radix(char *a[], int n)
{
    int i;
    RecType *s, *t = NULL;
    for (i = 0; i < n; i++)
    {
        s = (RecType*)malloc(sizeof(RecType));
        strcpy_s(s->data, a[i]);
        if (i == 0)
        {
            p = s;
            t = s;
        }
        else
        {
            t->next = s;
            t = s;
        }
    }
    t->next = NULL;
}

void main()
{
    char *a[10] = { "23", "24", "32", "56", "67", "45", "87", "98", "48", "65" };
    Radix r(a,10);
    DispLink(r);
    r.RadixSort(10,2);
    DispLink(r);
}