摘要: 17. Letter Combinations of a Phone Number Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number 阅读全文
posted @ 2019-09-18 03:07 Schwifty 阅读(151) 评论(0) 推荐(0)
摘要: Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. Example: backtracking的变种 阅读全文
posted @ 2019-09-18 02:33 Schwifty 阅读(145) 评论(0) 推荐(0)