摘要：2. Add Two Numbers You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse orderand each of 阅读全文

摘要：28、Implement strStr() Implement strStr(). Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Exa 阅读全文

摘要：27、 Remove Element Given an array nums and a value val, remove all instances of that value in-place and return the new length. Do not allocate extra s 阅读全文