JZ-C-16
剑指offer第十六题:反转链表
1 //============================================================================ 2 // Name : JZ-C-16.cpp 3 // Author : Laughing_Lz 4 // Version : 5 // Copyright : All Right Reserved 6 // Description : 反转链表 7 //============================================================================ 8 9 #include <iostream> 10 #include "List.h" 11 #include <stdio.h> 12 using namespace std; 13 14 ListNode* ReverseList(ListNode* pHead) { 15 ListNode* RevNode = pHead; 16 ListNode* Node = pHead; 17 ListNode* preNode = NULL; 18 while (Node != NULL) {//考虑链表为空的情况 19 ListNode* nexNode = Node->m_pNext; 20 if (nexNode == NULL) { 21 RevNode = Node; //在原链表最后一个结点处,将尾结点赋值为新链表的头结点 22 } 23 Node->m_pNext = preNode; //修改Next结点 24 preNode = Node; 25 Node = nexNode; 26 } 27 return RevNode; 28 } 29 30 // ====================测试代码==================== 31 ListNode* Test(ListNode* pHead) { 32 printf("The original list is: \n"); 33 PrintList(pHead); 34 35 ListNode* pReversedHead = ReverseList(pHead); 36 37 printf("The reversed list is: \n"); 38 PrintList(pReversedHead); 39 40 return pReversedHead; 41 } 42 43 // 输入的链表有多个结点 44 void Test1() { 45 ListNode* pNode1 = CreateListNode(1); 46 ListNode* pNode2 = CreateListNode(2); 47 ListNode* pNode3 = CreateListNode(3); 48 ListNode* pNode4 = CreateListNode(4); 49 ListNode* pNode5 = CreateListNode(5); 50 51 ConnectListNodes(pNode1, pNode2); 52 ConnectListNodes(pNode2, pNode3); 53 ConnectListNodes(pNode3, pNode4); 54 ConnectListNodes(pNode4, pNode5); 55 56 ListNode* pReversedHead = Test(pNode1); 57 58 DestroyList(pReversedHead); 59 } 60 61 // 输入的链表只有一个结点 62 void Test2() { 63 ListNode* pNode1 = CreateListNode(1); 64 65 ListNode* pReversedHead = Test(pNode1); 66 67 DestroyList(pReversedHead); 68 } 69 70 // 输入空链表 71 void Test3() { 72 Test(NULL); 73 } 74 75 int main(int argc, char** argv) { 76 Test1(); 77 Test2(); 78 Test3(); 79 80 return 0; 81 }
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