mirror of
https://github.com/Didnelpsun/CS408.git
synced 2026-02-04 03:14:30 +08:00
297 lines
7.8 KiB
C++
297 lines
7.8 KiB
C++
#include "link_list.h"
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class LinkListWithoutHead : public LinkList
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{
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private:
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// 数据
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element_type _data{};
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public:
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// 设置数据
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bool SetData(element_type elem);
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// 获取数据
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element_type GetData() const;
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element_type GetData(int index);
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// 构造函数
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LinkListWithoutHead();
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// 打印
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bool Print() override;
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// 插入
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bool Insert(int index, element_type elem) override;
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// 删除
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element_type *Delete(int index, int length) override;
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// 按位查找
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element_type GetElem(int index) override;
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// 按值查找
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int Locate(element_type elem) override;
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// 销毁
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bool Destroy() override;
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// 获取最大值
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int Max();
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// 获取最小值
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int Min();
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};
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bool LinkListWithoutHead::SetData(element_type elem)
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{
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this->_data = elem;
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return true;
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}
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element_type LinkListWithoutHead::GetData() const
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{
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return this->_data;
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}
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element_type LinkListWithoutHead::GetData(int index)
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{
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if (index < 0 || index >= this->GetLength() || this->GetLength() == 0)
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{
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cout << "GetData:Can't get the element by index of " << index << " !" << endl;
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return DEFAULTELEM;
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}
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if (index == 0)
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return this->GetData();
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LinkListNode *node = this->GetNext();
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for (int i = 1; i < index; i++)
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{
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node = node->GetNext();
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}
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return node->GetData();
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}
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LinkListWithoutHead::LinkListWithoutHead()
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{
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this->SetType(false);
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this->SetData(DEFAULTELEM);
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}
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bool LinkListWithoutHead::Print()
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{
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int i = 0;
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if (this->GetLength() == 0)
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{
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return true;
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}
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// cout << "第" << i << "个元素值为" << this->GetData() << endl;
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cout << "index: " << i << " -> value: " << this->GetData() << endl;
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// 当前遍历指针
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LinkListNode *node = this->GetNext();
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while (node != nullptr)
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{
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i++;
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// cout << "第" << i << "个元素值为" << node->GetData() << endl;
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cout << "index: " << i << " -> value: " << node->GetData() << endl;
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node = node->GetNext();
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}
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return true;
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}
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bool LinkListWithoutHead::Insert(int index, element_type elem)
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{
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if (index < 0)
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{
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// cout << "Insert:插入索引值" << index << "过小！" << endl;
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cout << "Insert:Insert index value " << index << " is too small!" << endl;
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return false;
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}
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if (index == 0)
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{
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if (this->GetLength() == 0)
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{
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this->SetData(elem);
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this->SetLength();
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}
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else
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{
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auto *node = new LinkListNode(this->GetData());
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node->SetNext(this->GetNext());
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this->SetData(elem);
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this->SetNext(node);
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this->SetLength();
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}
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return true;
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}
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// 定义一个结点指针node指向当前扫描到的结点
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LinkListNode *node;
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// 定义一个变量i表示当前扫描到的结点的索引号
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int i = 1;
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// 将链表头结点的next指向p，为第1个结点
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node = this->GetNext();
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// 设置一个新结点进行插入
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auto *new_node = new LinkListNode(elem);
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// 如果该链表为空链表
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if (node == nullptr)
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{
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this->SetLength();
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this->SetNext(new_node);
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return true;
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}
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// 循环遍历到达指定索引号的单链表的结点
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// 条件是当前结点的下一个不为空且索引号到达，所到达的结点一定不是空结点
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while (node->GetNext() != nullptr && i < index - 1)
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{
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node = node->GetNext();
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i++;
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}
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// 如果此时i小于index-1，表示遍历完还没有到达对应的索引
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if (i < index - 1)
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{
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// cout << "Insert:插入索引值" << index << "过大！" << endl;
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cout << "Insert:Insert index value" << index << " is too large!";
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return false;
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}
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// 此时i==index-1
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// 将p原来的后继给新的结点
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new_node->SetNext(node->GetNext());
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node->SetNext(new_node);
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this->SetLength();
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return true;
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}
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element_type *LinkListWithoutHead::Delete(int index, int length)
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{
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auto *data = new element_type[length];
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if (index < 0)
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{
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// cout << "Delete:删除索引值" << index << "过小！" << endl;
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cout << "Delete:Delete index value " << index << " is too small!";
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return data;
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}
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if (length < 1)
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{
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// cout << "Delete:删除长度" << length << "过小！" << endl;
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cout << "Delete:Delete length value " << length << " is too small!";
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return data;
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}
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// 定义一个结点指针start指向当前扫描到的结点，即要删除第一的元素的前一个
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LinkListNode *start;
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// 定义一个结点指针start指向当前扫描到的结点，要删除最后的元素
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LinkListNode *end;
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// 定义一个变量i表示当前扫描到的结点的索引号
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int i = 1;
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// 将链表头结点的next指向start，为第1个结点
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start = this->GetNext();
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// 如果链表没有任何数据
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if (this->GetData() == DEFAULTELEM)
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{
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// cout << "Delete:链表为空！" << endl;
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cout << "Delete:Link list is empty!" << endl;
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return data;
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}
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data[0] = this->GetData();
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// 循环遍历到达指定索引号的单链表的结点
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// 条件是当前结点的下一个不为空且索引号到达，所到达的结点一定不是空结点
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while (start->GetNext() != nullptr && i < index - 1)
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{
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start = start->GetNext();
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i++;
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}
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// 如果此时i小于index-1，表示遍历完还没有到达对应的索引
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if (i < index - 1)
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{
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// cout << "Delete:删除索引值" << index << "过大！" << endl;
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cout << "Delete:Delete index value " << index << " is too large!";
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return data;
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}
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// 从1开始遍历
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end = this->GetNext();
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for (int i = 1; i < index + length - 1; i++)
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{
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if (i >= index)
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{
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data[i - index] = end->GetData();
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}
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end = end->GetNext();
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if (end == nullptr)
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{
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// cout << "Delete:删除索引最大值" << index + length - 1 << "大于链表最大索引" << length - 1 << "！" << endl;
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cout << "Delete:Delete index value" << index + length - 1 << "is larger than link list's biggest index " << length - 1 << "!" << endl;
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return data;
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}
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}
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data[length - 1] = end->GetData();
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if (index == 0)
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{
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this->SetData(end->GetNext()->GetData());
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this->SetNext(end->GetNext()->GetNext());
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}
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if (index == 1)
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{
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this->SetNext(end->GetNext());
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}
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else
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{
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start->SetNext(end->GetNext());
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}
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this->SetLength(this->GetLength() - length);
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return data;
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}
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element_type LinkListWithoutHead::GetElem(int index)
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{
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return index == 0 ? this->GetData() : LinkList::GetElem(index);
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}
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int LinkListWithoutHead::Locate(element_type elem)
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{
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return this->GetData() == elem ? 0 : LinkList::Locate(elem);
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}
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bool LinkListWithoutHead::Destroy()
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{
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this->SetData(DEFAULTELEM);
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return LinkList::Destroy();
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}
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int LinkListWithoutHead::Max()
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{
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if (this->GetLength() == 0)
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{
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cout << "Max:The list is empty!" << endl;
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return -1;
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}
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element_type temp = this->GetData(0);
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int index = 0;
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for (int i = 1; i < this->GetLength(); i++)
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{
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if (this->GetData(i) > temp)
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{
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temp = this->GetData(i);
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index = i;
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}
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}
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return index;
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}
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int LinkListWithoutHead::Min()
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{
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if (this->GetLength() == 0)
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{
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cout << "Min:The list is empty!" << endl;
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return -1;
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}
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element_type temp = this->GetData(0);
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int index = 0;
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for (int i = 1; i < this->GetLength(); i++)
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{
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if (this->GetData(i) < temp)
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{
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temp = this->GetData(i);
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index = i;
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}
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}
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return index;
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}
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