//快慢指针,问题出在最后的return上 如果上述条件都不符合的话,返回空,这道题还可以用哈希表来做 unorderedmap class Solution { public: ListNode* FindFirstCommonNode(ListNode* pHead1, ListNode* pHead2) { ListNode* pTail1=pHead1; ListNode* pTail2=pHead2; ListNode* nFast, *nSlow; int len1=0, len2=0; while (pTail1) { pTail1 = pTail...