Jane_yuhui的专栏

【问题描述】 Implement strStr().Returns a pointer to the first occurrence of needle in haystack, or null if needle is not part of haystack. 实现strstr(). 返回needle(关键字)在haystack(字符串)中第一次出现的位置，如果needle不在haysta

【问题描述】Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.For example, “A man, a plan, a canal: Panama” is a palindrome. “race a car” is not a