摘要： 题目描述： Implement strStr(). Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 比对字符串haystack和needl 阅读全文

摘要： 题目描述： Given an array and a value, remove all instances of that value in-place and return the new length. Do not allocate extra space for another array 阅读全文