/
014_SortLists.cpp
197 lines (167 loc) · 4.76 KB
/
014_SortLists.cpp
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// Coding Interviews: Questions, Analysis & Solutions
// Harry He
#include <stdlib.h>
#include <stdio.h>
#include "../Utility/list.h"
void Sort(ListNode** pHead)
{
if(pHead == NULL || *pHead == NULL)
return;
ListNode* pLastSorted = *pHead;
ListNode* pToBeSorted = pLastSorted->m_pNext;
while(pToBeSorted != NULL)
{
if(pToBeSorted->m_nValue < (*pHead)->m_nValue)
{
pLastSorted->m_pNext = pToBeSorted->m_pNext;
pToBeSorted->m_pNext = *pHead;
*pHead = pToBeSorted;
}
else
{
ListNode* pNode = *pHead;
while(pNode != pLastSorted
&& pNode->m_pNext->m_nValue < pToBeSorted->m_nValue)
{
pNode = pNode->m_pNext;
}
if(pNode != pLastSorted)
{
pLastSorted->m_pNext = pToBeSorted->m_pNext;
pToBeSorted->m_pNext = pNode->m_pNext;
pNode->m_pNext = pToBeSorted;
}
else
pLastSorted = pLastSorted->m_pNext;
}
pToBeSorted = pLastSorted->m_pNext;
}
}
// ==================== Test Code ====================
void Test(char* testName, ListNode** pHead)
{
if(testName != NULL)
printf("%s begins: \n", testName);
if(pHead != NULL)
PrintList(*pHead);
Sort(pHead);
if(pHead != NULL)
PrintList(*pHead);
}
void Test1()
{
ListNode* pNode1 = CreateListNode(1);
ListNode* pNode2 = CreateListNode(3);
ListNode* pNode3 = CreateListNode(5);
ListNode* pNode4 = CreateListNode(7);
ListNode* pNode5 = CreateListNode(2);
ListNode* pNode6 = CreateListNode(4);
ListNode* pNode7 = CreateListNode(6);
ListNode* pNode8 = CreateListNode(8);
ConnectListNodes(pNode1, pNode2);
ConnectListNodes(pNode2, pNode3);
ConnectListNodes(pNode3, pNode4);
ConnectListNodes(pNode4, pNode5);
ConnectListNodes(pNode5, pNode6);
ConnectListNodes(pNode6, pNode7);
ConnectListNodes(pNode7, pNode8);
ListNode* pHead = pNode1;
Test("Test1", &pHead);
DestroyList(pHead);
}
// nodes in a list are already sorted
void Test2()
{
ListNode* pNode1 = CreateListNode(1);
ListNode* pNode2 = CreateListNode(2);
ListNode* pNode3 = CreateListNode(3);
ListNode* pNode4 = CreateListNode(4);
ListNode* pNode5 = CreateListNode(5);
ListNode* pNode6 = CreateListNode(6);
ListNode* pNode7 = CreateListNode(7);
ListNode* pNode8 = CreateListNode(8);
ConnectListNodes(pNode1, pNode2);
ConnectListNodes(pNode2, pNode3);
ConnectListNodes(pNode3, pNode4);
ConnectListNodes(pNode4, pNode5);
ConnectListNodes(pNode5, pNode6);
ConnectListNodes(pNode6, pNode7);
ConnectListNodes(pNode7, pNode8);
ListNode* pHead = pNode1;
Test("Test2", &pHead);
DestroyList(pHead);
}
// nodes in a list are decreasingly sorted
void Test3()
{
ListNode* pNode1 = CreateListNode(8);
ListNode* pNode2 = CreateListNode(7);
ListNode* pNode3 = CreateListNode(6);
ListNode* pNode4 = CreateListNode(5);
ListNode* pNode5 = CreateListNode(4);
ListNode* pNode6 = CreateListNode(3);
ListNode* pNode7 = CreateListNode(2);
ListNode* pNode8 = CreateListNode(1);
ConnectListNodes(pNode1, pNode2);
ConnectListNodes(pNode2, pNode3);
ConnectListNodes(pNode3, pNode4);
ConnectListNodes(pNode4, pNode5);
ConnectListNodes(pNode5, pNode6);
ConnectListNodes(pNode6, pNode7);
ConnectListNodes(pNode7, pNode8);
ListNode* pHead = pNode1;
Test("Test3", &pHead);
DestroyList(pHead);
}
// A list has only one node
void Test4()
{
ListNode* pNode1 = CreateListNode(1);
ListNode* pHead = pNode1;
Test("Test4", &pHead);
DestroyList(pHead);
}
// A list has duplicated nodes
void Test5()
{
ListNode* pNode1 = CreateListNode(1);
ListNode* pNode2 = CreateListNode(2);
ListNode* pNode3 = CreateListNode(2);
ListNode* pNode4 = CreateListNode(1);
ListNode* pNode5 = CreateListNode(4);
ListNode* pNode6 = CreateListNode(3);
ListNode* pNode7 = CreateListNode(4);
ListNode* pNode8 = CreateListNode(2);
ConnectListNodes(pNode1, pNode2);
ConnectListNodes(pNode2, pNode3);
ConnectListNodes(pNode3, pNode4);
ConnectListNodes(pNode4, pNode5);
ConnectListNodes(pNode5, pNode6);
ConnectListNodes(pNode6, pNode7);
ConnectListNodes(pNode7, pNode8);
ListNode* pHead = pNode1;
Test("Test5", &pHead);
DestroyList(pHead);
}
// Empty List
void Test6()
{
Test("Test6", NULL);
}
// Empty List
void Test7()
{
ListNode* pHead = NULL;
Test("Test7", &pHead);
}
int main(int argc, char* argv[])
{
Test1();
Test2();
Test3();
Test4();
Test5();
Test6();
Test7();
return 0;
}