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160. Intersection of Two Linked Lists
Write a program to find the node at which the intersection of two singly linked lists begins.
For example, the following two linked lists:
A: a1 → a2 ↘ c1 → c2 → c3 ↗ B: b1 → b2 → b3
begin to intersect at node c1.
求两个链表的交集。这里应该注意,如果在一个节点两个链表相交了,那么之后的节点也是相交的,所以我们可以这么做:
扫描到链表A或者链表B的末尾时,将A的尾部指针指向B的头,将B的尾部指针指向A的头,知道找到相同的节点
/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */class Solution {public: ListNode *getIntersectionNode(ListNode *headA, ListNode *headB) { ListNode *p1 = headA; ListNode *p2 = headB; bool mark1 = false; bool mark2 = false; while(p1 != nullptr && p2 != nullptr) { if (p1 == p2) return p1; p1 = p1->next; p2 = p2->next; if (p1 == nullptr && !mark1) p1 = headB,mark1 = true; if (p2 == nullptr && !mark2) p2 = headA,mark2 = true; } return nullptr; }};
160. Intersection of Two Linked Lists
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