/*
struct ListNode {
int val;
struct ListNode *next;
ListNode(int x) :
val(x), next(NULL) {
}
};*/
class Solution {
public:
ListNode* FindFirstCommonNode( ListNode* pHead1, ListNode* pHead2)
{
ListNode*p=pHead1;
unordered_set<ListNode*>hash;
while(p)
{
hash.insert(p);
p=p->next;
}
p=pHead2;
while(p)
{
if(hash.count(p))
{
return p;
}
p=p->next;
}
return NULL;
}
};



京公网安备 11010502036488号