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/*
struct ListNode {
int val;
struct ListNode *next;
ListNode(int x) :
val(x), next(NULL) {
}
};*/
class Solution {
public:
ListNode* FindFirstCommonNode( ListNode* pHead1, ListNode* pHead2) {
ListNode* p1 = pHead1, * p2 = pHead2;
while(p1 != p2)
{
p1 = (p1 == NULL ? pHead2 : p1->next);
p2 = (p2 == NULL ? pHead1 : p2->next);
}
return p1;
}
};