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My notes on leetcode
Monday, June 3, 2019 Leetcode 752 Open the Lock 题目原文 You have a lock in front of you with 4 circular wheels. Each wheel has 10 slots: '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'. The wheels can rotate freely and wrap around: for example we can turn...
解开的都是套路
Thursday, December 21, 2017 Facebook脸家 - Lexicographical path Lexicographical path 5 / \ 3 2 / \ \ 2 4 4 \ 1 FB 面经,自底向上的 path 有【1,4,2,5】,【4,3,5】,【2,3,5】,要求按自底向上的 lexicographical order 返回排序的 path,比如在这里是 【1,4,2,5】, 【2,3,5】,【4,3,5】 Analysis: Post order, for each node keep left & right paths, merge 2 into one single path....