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//算法8.3 希尔排序
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#include <iostream>
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using namespace std;
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#define MAXSIZE 20 //顺序表的最大长度
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typedef struct
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{
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int key;
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char *otherinfo;
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}ElemType;
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//顺序表的存储结构
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typedef struct
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{
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ElemType *r; //存储空间的基地址
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int length; //顺序表长度
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}SqList; //顺序表类型
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void ShellInsert(SqList &L,int dk)
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{
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//对顺序表L做一趟增量是dk的希尔插入排序
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int i,j;
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for(i=dk+1;i<=L.length;++i)
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if(L.r[i].key<L.r[i-dk].key)
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{ //需将L.r[i]插入有序增量子表
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L.r[0]=L.r[i]; //暂存在L.r[0]
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for(j=i-dk;j>0&& L.r[0].key<L.r[j].key;j-=dk)
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L.r[j+dk]=L.r[j]; //记录后移,直到找到插入位置
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L.r[j+dk]=L.r[0]; //将r[0]即原r[i],插入到正确位置
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} //for
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}
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//ShellInsert
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void ShellSort(SqList &L,int dt[ ],int t){
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//按增量序列dt[0..t-1]对顺序表L作t趟希尔排序
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int k;
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for(k=0;k<t;++k)
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ShellInsert(L,dt[k]); //一趟增量为dt[t]的希尔插入排序
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} //ShellSort
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void Create_Sq(SqList &L)
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{
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int i,n;
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cout<<"请输入数据个数,不超过"<<MAXSIZE<<"个。"<<endl;
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cin>>n; //输入个数
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cout<<"请输入待排序的数据:\n";
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while(n>MAXSIZE)
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{
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cout<<"个数超过上限,不能超过"<<MAXSIZE<<",请重新输入"<<endl;
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cin>>n;
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}
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for(i=1;i<=n;i++)
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{
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cin>>L.r[i].key;
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L.length++;
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}
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}
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void show(SqList L)
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{
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int i;
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for(i=1;i<=L.length;i++)
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cout<<L.r[i].key<<endl;
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}
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void main()
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{
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SqList L;
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L.r=new ElemType[MAXSIZE+1];
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L.length=0;
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Create_Sq(L);
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int i,t;//增量数组的长度
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int *dt=new int[MAXSIZE];//增量数组
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cout<<"请输入增量个数:\n";
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cin>>t;
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for(i=0;i<t;i++)
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{
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cout<<"第"<<i+1<<"个增量:\n";
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cin>>dt[i];
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}
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ShellSort(L,dt,t);
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cout<<"排序后的结果为:"<<endl;
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show(L);
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}
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