## 题目描述：

LeetCode 814. Binary Tree Pruning

We are given the head node `root` of a binary tree, where additionally every node's value is either a 0 or a 1.

Return the same tree where every subtree (of the given tree ...

## 题目描述：

LeetCode 812. Largest Triangle Area

You have a list of points in the plane. Return the area of the largest triangle that can be formed by any 3 of the points.

```Example:
Input: points = [[0,0],[0,1],[1 ...```

## 题目描述：

LeetCode 808. Soup Servings

There are two types of soup: type A and type B. Initially we have `N` ml of each type of soup. There are four kinds of operations:

1. Serve 100 ml of soup A and 0 ml ...

## 题目描述：

LeetCode 809. Expressive Words

Sometimes people repeat letters to represent extra feeling, such as "hello" -> "heeellooo", "hi" -> "hiiii".  Here, we have groups, of adjacent letters that are all the same character, and adjacent characters to the group are ...

## 题目描述：

LeetCode 811. Subdomain Visit Count

A website domain like "discuss.leetcode.com" consists of various subdomains. At the top level, we have "com", at the next level, we have "leetcode.com", and at the lowest level, "discuss.leetcode.com" ...