Leetcode 160. 相交链表

69岁的老干部

于 2022-11-13 16:28:33 发布

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分类专栏：刷题 leetcode 文章标签：链表 leetcode 数据结构

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题目叙述

题解代码

提交结果

题目叙述

题解代码

class Solution {
public:
    ListNode *getIntersectionNode(ListNode *headA, ListNode *headB) {
        ListNode* curA = headA;
        ListNode* curB = headB;
        int lenA = 0, lenB = 0;
        while(curA != NULL)
        {
            lenA++;
            curA = curA->next;
        }
        while(curB != NULL)
        {
            lenB++;
            curB = curB->next;
        }
        curA = headA;
        curB = headB;
        if(lenB > lenA)
        {
            swap(lenA,lenB);
            swap(curA,curB);
        }
        int gap = lenA - lenB;
        while(gap--)
        {
            curA = curA->next;
        }
        while(curA != NULL)
        {
            if(curA == curB)
            {
                return curA;
            }
            curA = curA->next;
            curB = curB->next;
        }
    return NULL;
    }
};