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//算法8.2 折半插入排序
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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
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void BInsertSort(SqList &L){
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//对顺序表L做折半插入排序
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int i,j,low,high,m;
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for(i=2;i<=L.length;++i)
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{
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L.r[0]=L.r[i]; //将待插入的记录暂存到监视哨中
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low=1; high=i-1; //置查找区间初值
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while(low<=high)
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{ //在r[low..high]中折半查找插入的位置
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m=(low+high)/2; //折半
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if(L.r[0].key<L.r[m].key) high=m-1; //插入点在前一子表
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else low=m+1; //插入点在后一子表
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}//while
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for(j=i-1;j>=high+1;--j) L.r[j+1]=L.r[j]; //记录后移
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L.r[high+1]=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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} //BInsertSort
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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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BInsertSort(L);
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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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