摘要：
LeetCode 779. K-th Symbol in Grammar 一道找规律的题。 题目描述 On the first row, we write a 0. Now in every subsequent row, we look at the previous row and replac 阅读全文
摘要：
LeetCode 28. Implement strStr() 题目描述 Implement strStr(). Return the index of the first occurrence of needle in haystack, or -1 if needle is not part o 阅读全文