题目描述：

LeetCode 409. Longest Palindrome

Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those letters.

This is case sensitive, for example "Aa" is not considered a ...

题目描述：

LeetCode 408. Valid Word Abbreviation

Given a non-empty string s and an abbreviation abbr, return whether the string matches with the given abbreviation.

A string such as "word" contains only the following valid abbreviations:

["word", "1ord", "w1rd", "wo1d", "wor1" ...

LeetCode Weekly Contest 6是LeetCode举办的第五场正式周赛，共4道题目，比赛时长2.5小时。

比赛链接：https://leetcode.com/contest/leetcode-weekly-contest-6/

题解列表：

LeetCode 404. Sum of Left Leaves

LeetCode 405. Convert a Number to Hexadecimal

LeetCode 406. Queue Reconstruction by Height

LeetCode 407. Trapping Rain Water II

题目描述：

LeetCode 407. Trapping Rain Water II

Given an m x n matrix of positive integers representing the height of each unit cell in a 2D elevation map, compute the volume of water it is able to trap after raining ...

题目描述：

LeetCode 406. Queue Reconstruction by Height

Suppose you have a random list of people standing in a queue. Each person is described by a pair of integers (h, k), where h is the height of the person and k ...