Initial commit for question 25

zhedahht · Nov 24, 2016 · b2f2034 · b2f2034
1 parent bd572a8
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diff --git a/25_MergeSortedLists/25_MergeSortedLists.vcxproj b/25_MergeSortedLists/25_MergeSortedLists.vcxproj
@@ -0,0 +1,155 @@
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diff --git a/25_MergeSortedLists/25_MergeSortedLists.vcxproj.filters b/25_MergeSortedLists/25_MergeSortedLists.vcxproj.filters
@@ -0,0 +1,22 @@
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diff --git a/25_MergeSortedLists/MergeSortedLists.cpp b/25_MergeSortedLists/MergeSortedLists.cpp
@@ -0,0 +1,153 @@
+//==================================================================
+// 《剑指Offer——名企面试官精讲典型编程题》代码
+// 著作权所有者：何海涛
+//==================================================================
+
+// 面试题24：合并两个排序的链表
+// 题目：输入两个递增排序的链表，合并这两个链表并使新链表中的结点仍然是按
+// 照递增排序的。例如输入图3.11中的链表1和链表2，则合并之后的升序链表如链
+// 表3所示。
+
+#include "cstdio"
+#include "..\Utilities\List.h"
+
+ListNode* Merge(ListNode* pHead1, ListNode* pHead2)
+{
+    if(pHead1 == nullptr)
+        return pHead2;
+    else if(pHead2 == nullptr)
+        return pHead1;
+
+    ListNode* pMergedHead = nullptr;
+
+    if(pHead1->m_nValue < pHead2->m_nValue)
+    {
+        pMergedHead = pHead1;
+        pMergedHead->m_pNext = Merge(pHead1->m_pNext, pHead2);
+    }
+    else
+    {
+        pMergedHead = pHead2;
+        pMergedHead->m_pNext = Merge(pHead1, pHead2->m_pNext);
+    }
+
+    return pMergedHead;
+}
+
+// ====================测试代码====================
+ListNode* Test(char* testName, ListNode* pHead1, ListNode* pHead2)
+{
+    if(testName != nullptr)
+        printf("%s begins:\n", testName);
+
+    printf("The first list is:\n");
+    PrintList(pHead1);
+
+    printf("The second list is:\n");
+    PrintList(pHead2);
+
+    printf("The merged list is:\n");
+    ListNode* pMergedHead = Merge(pHead1, pHead2);
+    PrintList(pMergedHead);
+
+    printf("\n\n");
+
+    return pMergedHead;
+}
+
+// list1: 1->3->5
+// list2: 2->4->6
+void Test1()
+{
+    ListNode* pNode1 = CreateListNode(1);
+    ListNode* pNode3 = CreateListNode(3);
+    ListNode* pNode5 = CreateListNode(5);
+
+    ConnectListNodes(pNode1, pNode3);
+    ConnectListNodes(pNode3, pNode5);
+
+    ListNode* pNode2 = CreateListNode(2);
+    ListNode* pNode4 = CreateListNode(4);
+    ListNode* pNode6 = CreateListNode(6);
+
+    ConnectListNodes(pNode2, pNode4);
+    ConnectListNodes(pNode4, pNode6);
+
+    ListNode* pMergedHead = Test("Test1", pNode1, pNode2);
+
+    DestroyList(pMergedHead);
+}
+
+// 两个链表中有重复的数字
+// list1: 1->3->5
+// list2: 1->3->5
+void Test2()
+{
+    ListNode* pNode1 = CreateListNode(1);
+    ListNode* pNode3 = CreateListNode(3);
+    ListNode* pNode5 = CreateListNode(5);
+
+    ConnectListNodes(pNode1, pNode3);
+    ConnectListNodes(pNode3, pNode5);
+
+    ListNode* pNode2 = CreateListNode(1);
+    ListNode* pNode4 = CreateListNode(3);
+    ListNode* pNode6 = CreateListNode(5);
+
+    ConnectListNodes(pNode2, pNode4);
+    ConnectListNodes(pNode4, pNode6);
+
+    ListNode* pMergedHead = Test("Test2", pNode1, pNode2);
+
+    DestroyList(pMergedHead);
+}
+
+// 两个链表都只有一个数字
+// list1: 1
+// list2: 2
+void Test3()
+{
+    ListNode* pNode1 = CreateListNode(1);
+    ListNode* pNode2 = CreateListNode(2);
+
+    ListNode* pMergedHead = Test("Test3", pNode1, pNode2);
+
+    DestroyList(pMergedHead);
+}
+
+// 一个链表为空链表
+// list1: 1->3->5
+// list2: 空链表
+void Test4()
+{
+    ListNode* pNode1 = CreateListNode(1);
+    ListNode* pNode3 = CreateListNode(3);
+    ListNode* pNode5 = CreateListNode(5);
+
+    ConnectListNodes(pNode1, pNode3);
+    ConnectListNodes(pNode3, pNode5);
+
+    ListNode* pMergedHead = Test("Test4", pNode1, nullptr);
+
+    DestroyList(pMergedHead);
+}
+
+// 两个链表都为空链表
+// list1: 空链表
+// list2: 空链表
+void Test5()
+{
+    ListNode* pMergedHead = Test("Test5", nullptr, nullptr);
+}
+
+int main(int argc, char* argv[])
+{
+    Test1();
+    Test2();
+    Test3();
+    Test4();
+    Test5();
+
+    return 0;
+}
+
diff --git a/CodingInterviewChinese2.sln b/CodingInterviewChinese2.sln
@@ -60,6 +60,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "23_EntryNodeInListLoop", "2
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "24_ReverseList", "24_ReverseList\24_ReverseList.vcxproj", "{58FC36C7-E34D-402A-B028-6AD0D0D11FC3}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "25_MergeSortedLists", "25_MergeSortedLists\25_MergeSortedLists.vcxproj", "{55D7F9A4-14A2-40EE-9EAB-2A2D03D19EBE}"
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