• 剑指Offer35 两个链表第一个公共结点


      1 /*************************************************************************
      2     > File Name: 35_FirstCommonNode.cpp
      3     > Author: Juntaran
      4     > Mail: JuntaranMail@gmail.com
      5     > Created Time: 2016年09月02日 星期五 20时52分28秒
      6  ************************************************************************/
      7 
      8 #include <stdio.h>
      9 #include <malloc.h>
     10 
     11 // 链表结构体
     12 struct ListNode
     13 {
     14     int val;
     15     struct ListNode* next;
     16 };
     17 
     18 // 顺序输出链表
     19 void PrintList(ListNode* head)
     20 {
     21     if (head == NULL)
     22         return;
     23     ListNode* temp = head;
     24     printf("PrintList:
    ");
     25     while (temp != NULL)
     26     {
     27         printf("%d ", temp->val);
     28         temp = temp->next;
     29     }
     30     printf("
    ");
     31 }
     32 
     33 // 获取链表长度
     34 int getListLength(ListNode* head)
     35 {
     36     int length = 0;
     37     ListNode* p = head;
     38     while (p)
     39     {
     40         length ++;
     41         p = p->next;
     42     }
     43     return length;
     44 }
     45 
     46 // 寻找第一个公共结点
     47 ListNode* FindFirstCommonNode(ListNode* head1, ListNode* head2)
     48 {
     49     int length1 = getListLength(head1);
     50     int length2 = getListLength(head2);
     51     
     52     ListNode* longList;
     53     ListNode* shortList;
     54     int diff;
     55     
     56     if (length1 >= length2)
     57     {
     58         longList = head1;
     59         shortList = head2;
     60         diff = length1 - length2;
     61     }
     62     else
     63     {
     64         longList = head2;
     65         shortList = head1;
     66         diff = length2 - length1;
     67     }
     68     
     69     for (int i = 0; i < diff; ++i)
     70         longList = longList->next;
     71     
     72     while (longList && shortList && shortList!=longList)
     73     {
     74         longList = longList->next;
     75         shortList = shortList->next;
     76     }
     77     
     78     if (longList == NULL)
     79         printf("Not Find
    ");
     80     else
     81         printf("Find %d
    ", longList->val);
     82     
     83     return longList;
     84 }
     85 
     86 int main()
     87 {
     88     // 测试链表结构
     89     ListNode* head1 = (ListNode*)malloc(sizeof(ListNode));
     90     head1->val = 1;
     91     ListNode* p1 = head1;
     92     for (int i = 0; i < 4; ++i)
     93     {
     94         ListNode* q1 = (ListNode*)malloc(sizeof(ListNode));
     95         q1->val = i + 2;
     96         p1->next = q1;
     97         p1 = q1;
     98     }
     99     p1->next = NULL;
    100     
    101     
    102     ListNode* head2 = (ListNode*)malloc(sizeof(ListNode));
    103     head2->val = 6;
    104     ListNode* p2 = head2;
    105     for (int i = 0; i < 4; ++i)
    106     {
    107         ListNode* q2 = (ListNode*)malloc(sizeof(ListNode));
    108         q2->val = i + 7;
    109         p2->next = q2;
    110         p2 = q2;
    111     }
    112     p2->next = NULL;
    113     
    114     p1->next = head2->next->next;
    115     
    116     PrintList(head1);
    117     PrintList(head2);
    118     
    119     FindFirstCommonNode(head1, head2);
    120 }
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  • 原文地址:https://www.cnblogs.com/Juntaran/p/5835671.html
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