题目描述：

LeetCode 676. Implement Magic Dictionary

Implement a magic directory with buildDict, and search methods.

For the method buildDict, you'll be given a list of non-repetitive words to build a dictionary.

For the method search, you'll be given a word ...

题目描述：

LeetCode 674. Longest Continuous Increasing Subsequence

Given an unsorted array of integers, find the length of longest continuous increasing subsequence.

Example 1:

Input: [1,3,5,4,7]
Output: 3
Explanation: The longest continuous increasing subsequence is [1,3 ...

LeetCode Weekly Contest 48是LeetCode举办的第五十三场正式周赛，共4道题目，比赛时长1.5小时。

比赛链接：https://leetcode.com/contest/leetcode-weekly-contest-48/

题解列表：

LeetCode 671. Second Minimum Node In a Binary Tree

LeetCode 669. Trim a Binary Search Tree

LeetCode 670. Maximum Swap

LeetCode 672. Bulb Switcher II

题目描述：

LeetCode 672. Bulb Switcher II

There is a room with n lights which are turned on initially and 4 buttons on the wall. After performing exactly m unknown operations towards buttons, you need to return how many different kinds ...

题目描述：

LeetCode 670. Maximum Swap

Given a non-negative integer, you could swap two digits at most once to get the maximum valued number. Return the maximum valued number you could get.

Example 1:

Input: 2736
Output: 7236
Explanation: Swap the ...