摘要： problem：You are given a string,S, and a list of words,L, that are all of the same length. Find all starting indices of substring(s) in S that is a con... 阅读全文

摘要： Divide two integers without using multiplication, division and mod operator.分析：题目意思很容易理解，就是不用乘除法和模运算求来做除法，很容易想到的一个方法是一直做减法，然后计数，超时。在网上找到一种解法，利用位运算，意思是... 阅读全文

摘要： Implement strStr().Returns a pointer to the first occurrence of needle in haystack, ornullif needle is not part of haystack.就是判断haystack中是否有needle，如果包... 阅读全文