题目描述：
LeetCode 742. Closest Leaf in a Binary Tree
Given a binary tree where every node has a unique value, and a target key k, find the closest leaf node to target k in the tree.
A node is called ...
[LeetCode]Closest Leaf in a Binary Tree
[LeetCode]Network Delay Time
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LeetCode.
题目描述：
LeetCode 743. Network Delay Time
There are N network nodes, labelled 1 to N.
Given times, a list of travel times as directed edges times[i] = (u, v, w), where u is the source node, v is the target ...
[LeetCode]Find Smallest Letter Greater Than Target
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LeetCode.
题目描述：
LeetCode 744. Find Smallest Letter Greater Than Target
Given a list of sorted characters letters containing only lowercase letters, and given a target letter target, find the smallest element in the list that is larger than the given target ...
[LeetCode]Delete and Earn
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LeetCode.
题目描述：
Given an array nums of integers, you can perform operations on the array.
In each operation, you pick any nums[i] and delete it to earn nums[i] points. After, you must delete every ...
[LeetCode]Monotone Increasing Digits
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LeetCode.
题目描述：
LeetCode 738. Monotone Increasing Digits
Given a non-negative integer N, find the largest number that is less than or equal to N with monotone increasing digits.
(Recall that an integer has monotone increasing digits if and only if each ...