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35_CopyComplexList.cpp
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198 lines (163 loc) · 4.96 KB
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/*******************************************************************
Copyright(c) 2016, Harry He
All rights reserved.
Distributed under the BSD license.
(See accompanying file LICENSE.txt at
https://github.com/zhedahht/CodingInterviewChinese2/blob/master/LICENSE.txt)
*******************************************************************/
//==================================================================
// 《剑指Offer——名企面试官精讲典型编程题》代码
// 作者：何海涛
//==================================================================
// 面试题35：复杂链表的复制
// 题目：请实现函数ComplexListNode* Clone(ComplexListNode* pHead)，复
// 制一个复杂链表。在复杂链表中，每个结点除了有一个m_pNext指针指向下一个
// 结点外，还有一个m_pSibling 指向链表中的任意结点或者nullptr。
#include <cstdio>
#include "ComplexList.h"
void CloneNodes(ComplexListNode* pHead);
void ConnectSiblingNodes(ComplexListNode* pHead);
ComplexListNode* ReconnectNodes(ComplexListNode* pHead);
ComplexListNode* Clone(ComplexListNode* pHead)
{
CloneNodes(pHead);
ConnectSiblingNodes(pHead);
return ReconnectNodes(pHead);
}
void CloneNodes(ComplexListNode* pHead)
{
ComplexListNode* pNode = pHead;
while(pNode != nullptr)
{
ComplexListNode* pCloned = new ComplexListNode();
pCloned->m_nValue = pNode->m_nValue;
pCloned->m_pNext = pNode->m_pNext;
pCloned->m_pSibling = nullptr;
pNode->m_pNext = pCloned;
pNode = pCloned->m_pNext;
}
}
void ConnectSiblingNodes(ComplexListNode* pHead)
{
ComplexListNode* pNode = pHead;
while(pNode != nullptr)
{
ComplexListNode* pCloned = pNode->m_pNext;
if(pNode->m_pSibling != nullptr)
{
pCloned->m_pSibling = pNode->m_pSibling->m_pNext;
}
pNode = pCloned->m_pNext;
}
}
ComplexListNode* ReconnectNodes(ComplexListNode* pHead)
{
ComplexListNode* pNode = pHead;
ComplexListNode* pClonedHead = nullptr;
ComplexListNode* pClonedNode = nullptr;
if(pNode != nullptr)
{
pClonedHead = pClonedNode = pNode->m_pNext;
pNode->m_pNext = pClonedNode->m_pNext;
pNode = pNode->m_pNext;
}
while(pNode != nullptr)
{
pClonedNode->m_pNext = pNode->m_pNext;
pClonedNode = pClonedNode->m_pNext;
pNode->m_pNext = pClonedNode->m_pNext;
pNode = pNode->m_pNext;
}
return pClonedHead;
}
// ====================测试代码====================
void Test(const char* testName, ComplexListNode* pHead)
{
if(testName != nullptr)
printf("%s begins:\n", testName);
printf("The original list is:\n");
PrintList(pHead);
ComplexListNode* pClonedHead = Clone(pHead);
printf("The cloned list is:\n");
PrintList(pClonedHead);
}
// -----------------
// \|/ |
// 1-------2-------3-------4-------5
// | | /|\ /|\
// --------+-------- |
// -------------------------
void Test1()
{
ComplexListNode* pNode1 = CreateNode(1);
ComplexListNode* pNode2 = CreateNode(2);
ComplexListNode* pNode3 = CreateNode(3);
ComplexListNode* pNode4 = CreateNode(4);
ComplexListNode* pNode5 = CreateNode(5);
BuildNodes(pNode1, pNode2, pNode3);
BuildNodes(pNode2, pNode3, pNode5);
BuildNodes(pNode3, pNode4, nullptr);
BuildNodes(pNode4, pNode5, pNode2);
Test("Test1", pNode1);
}
// m_pSibling指向结点自身
// -----------------
// \|/ |
// 1-------2-------3-------4-------5
// | | /|\ /|\
// | | -- |
// |------------------------|
void Test2()
{
ComplexListNode* pNode1 = CreateNode(1);
ComplexListNode* pNode2 = CreateNode(2);
ComplexListNode* pNode3 = CreateNode(3);
ComplexListNode* pNode4 = CreateNode(4);
ComplexListNode* pNode5 = CreateNode(5);
BuildNodes(pNode1, pNode2, nullptr);
BuildNodes(pNode2, pNode3, pNode5);
BuildNodes(pNode3, pNode4, pNode3);
BuildNodes(pNode4, pNode5, pNode2);
Test("Test2", pNode1);
}
// m_pSibling形成环
// -----------------
// \|/ |
// 1-------2-------3-------4-------5
// | /|\
// | |
// |---------------|
void Test3()
{
ComplexListNode* pNode1 = CreateNode(1);
ComplexListNode* pNode2 = CreateNode(2);
ComplexListNode* pNode3 = CreateNode(3);
ComplexListNode* pNode4 = CreateNode(4);
ComplexListNode* pNode5 = CreateNode(5);
BuildNodes(pNode1, pNode2, nullptr);
BuildNodes(pNode2, pNode3, pNode4);
BuildNodes(pNode3, pNode4, nullptr);
BuildNodes(pNode4, pNode5, pNode2);
Test("Test3", pNode1);
}
// 只有一个结点
void Test4()
{
ComplexListNode* pNode1 = CreateNode(1);
BuildNodes(pNode1, nullptr, pNode1);
Test("Test4", pNode1);
}
// 鲁棒性测试
void Test5()
{
Test("Test5", nullptr);
}
int main(int argc, char* argv[])
{
Test1();
Test2();
Test3();
Test4();
Test5();
return 0;
}