双指针做法时间,空间 O(n) /* struct ListNode { int val; struct ListNode *next; ListNode(int x) : val(x), next(NULL) { } };*/ class Solution { public: ListNode* FindKthToTail(ListNode* pListHead, unsigned int k) { if(pListHead==NULL) return NULL; ListNode* p = pListHead; ListNode* q = p; for(int i=0;i<k-1;i...