2020年1月14日
Lc22-Generate Parentheses
摘要： Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is: [ 阅读全文
posted @ 2020-01-14 16:44 小傻孩丶儿 阅读(142) 评论(0) 推荐(0)
Lc20-Valid Parentheses
摘要： import java.util.Stack; /* * Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An 阅读全文
posted @ 2020-01-14 11:22 小傻孩丶儿 阅读(111) 评论(0) 推荐(0)
Lc262-行程和用户
摘要： select t.request_at Day, ( round(count(if(status != 'completed', status, null)) / count(status), 2) ) as 'Cancellation Rate' from Users u inner join T 阅读全文
posted @ 2020-01-14 09:33 小傻孩丶儿 阅读(209) 评论(0) 推荐(0)