C++ 实现分块查找(链式存储结构)(完整代码)
作者:互联网
#include <iostream>
using namespace std;
const int INFMIN = -999999;
class Node
{
friend class IdxTab;
public:
Node() :next(nullptr) {};
private:
int w;
Node *next;
};
class IdxNode
{
friend class IdxTab;
private:
int maxk;
Node *fidx;
};
class IdxTab
{
public:
void CreateList();
void Prient_Elem_maxk();//输出查找表的元素
void Print_Elem_w();//输出元素
bool Find_Elem(int k);//查找值为k的元素
bool Insert(int k);//插入元素k
bool Delete(int k);//删除元素k
~IdxTab();
private:
IdxNode *elem;
int len;
};
IdxTab::~IdxTab()
{
Node *p,*q;
for (int i = 0; i <= len; i++)
{
p = elem[i].fidx;
if (p == nullptr) continue;
q = p->next;
delete p;
if (q == nullptr) continue;
else
p = q;
}
for (int i = 0; i <= len; i++) elem[i].fidx = nullptr;
}
void IdxTab::CreateList()
{
Node *p;
int n;
int N;
cout << "请输入要存储的数的个数" << endl;
cin >> n;
cout << "请输入每大块中每小块的数目是多少" << endl;
cin >> N;
int m = (n / N) + 1;
len = m;
elem = new IdxNode[m + 1];
for (int i = 0; i < m + 1; i++) elem[i].fidx = nullptr;
int cnt = 0;//计数器
cout << "请依次输入要存储的数" << endl;
for (int i = 1; i <= len; i++)
{
elem[i].maxk = INFMIN;
for (int j = 1; j <= N && cnt < n; j++)//因为可能输入的n不够整除,查找表最后一个节点可能连的节点比较少,用
//cnt<n,来处理这种情况
{
cnt++;
p = new Node;
int tmp;
cin >>tmp;
p->w = tmp;
p->next = elem[i].fidx;
elem[i].fidx = p;
if (tmp > elem[i].maxk) elem[i].maxk = tmp;//更新maxk
}
}
for (int i = 1; i <= len-1; i++)//选择排序给查找表排序
{
int minv = i;
for (int j = i + 1; j <= len; j++)
if (elem[minv].maxk > elem[j].maxk)
minv = j;
if (i != minv)
{
int tmp = elem[i].maxk;
elem[i].maxk = elem[minv].maxk;
elem[minv].maxk = tmp;
Node *s;
s = elem[i].fidx;
elem[i].fidx = elem[minv].fidx;
elem[minv].fidx = s;
}
}
}
bool IdxTab::Find_Elem(int k)
{
if (k > elem[len].maxk) return false;//如果输入的k直接大于最大的元素,直接return false;
int j = 1;
while (elem[j].maxk < k) j++;
Node *p;
for (p = elem[j].fidx;p;p = p->next)
{
if ((p->w) == k) return true;
}
return false;
}
bool IdxTab::Insert(int k)
{
Node *s;
int j = 1;
if (k > elem[len].maxk)//如果k大于最大元素,直接处理查找表最后一个节点
{
s = new Node;
s->w = k;
s->next = elem[len].fidx;
elem[len].fidx = s;
elem[len].maxk = k;
return true;
}
else
while (elem[j].maxk < k) j++;
s = new Node;
s->w = k;
s->next = elem[j].fidx;
elem[j].fidx = s;
return true;
}
bool IdxTab::Delete(int k)
{
if (k > elem[len].maxk) return false;
int j = 1;
while (elem[j].maxk < k) j++;
Node *p, *q;
p = elem[j].fidx;
bool flag = false;//用flag表示有没有值为k这个元素
if ((p->w) == k)//因为没有空白头节点,所以要特别判断一下要删除的是fidx
{
flag = true;
elem[j].fidx = p->next;
delete p;
}
else
for (q = elem[j].fidx; q->next; q = q->next)
{
if ((q->next->w) == k)
{
flag = true;
p = q->next;
q->next = p->next;
delete p;
break;
}
}
if (k == elem[j].maxk)//判断删除的是不是更好是值为最大关键字
{
elem[j].maxk = INFMIN;
for (p = elem[j].fidx; p; p = p->next)
{
if ((p->w) > elem[j].maxk) elem[j].maxk = p->w;
}
if (j == len) return true;
for (int i = 1; i <= len - 1; i++)//选择排序给查找表排序
{
int minv = i;
for (int j = i + 1; j <= len; j++)
if (elem[minv].maxk > elem[j].maxk)
minv = j;
if (i != minv)
{
int tmp = elem[i].maxk;
elem[i].maxk = elem[minv].maxk;
elem[minv].maxk = tmp;
Node *s;
s = elem[i].fidx;
elem[i].fidx = elem[minv].fidx;
elem[minv].fidx = s;
}
}
if (flag) return true;
return false;
}
}
void IdxTab::Print_Elem_w()
{
Node *p;
for (int i = 1; i <= len; i++)
{
for (p = elem[i].fidx; p; p = p->next) cout << p->w << " ";
}
cout << endl;
}
void IdxTab::Prient_Elem_maxk()
{
for (int i = 1; i <= len; i++) cout << elem[i].maxk << " ";
cout << endl;
}
int main()
{
IdxTab l;
l.CreateList();
l.Prient_Elem_maxk();
l.Print_Elem_w();
int k;
cin >> k;
l.Insert(k);
l.Prient_Elem_maxk();
l.Print_Elem_w();
cin >> k;
l.Insert(k);
l.Prient_Elem_maxk();
l.Print_Elem_w();
cin >> k;
l.Delete(k);
l.Prient_Elem_maxk();
l.Print_Elem_w();
cin >> k;
l.Delete(k);
l.Prient_Elem_maxk();
l.Print_Elem_w();
return 0;
}
测试结果:
标签:fidx,分块,int,elem,C++,next,maxk,链式,Elem 来源: https://blog.csdn.net/m0_51955470/article/details/116542844