题目描述：
LeetCode 380. Insert Delete GetRandom O(1)
Design a data structure that supports all following operations in O(1) time.
insert(val): Inserts an item val to the set if not already present.remove(val): Removes an item val ...
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[LeetCode]Insert Delete GetRandom O(1)
[LeetCode]Kth Smallest Element in a Sorted Matrix
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LeetCode 378. Kth Smallest Element in a Sorted Matrix
Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix.
Note that it is ...
[LeetCode]Combination Sum IV
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LeetCode 377. Combination Sum IV
Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target.
Example:
nums = [1, 2, 3] target = 4 The possible ...
[LeetCode]Wiggle Subsequence
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LeetCode 376. Wiggle Subsequence
A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alternate between positive and negative. The first difference (if one exists) may be either positive or negative. A sequence ...
[LeetCode]Trips and Users
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The Trips table holds all taxi trips. Each trip has a unique Id, while Client_Id and Driver_Id are both foreign keys to the Users_Id at the Users table. Status is an ENUM type of ...