题目描述：
LeetCode 382. Linked List Random Node
Given a singly linked list, return a random node's value from the linked list. Each node must have the same probability of being chosen.
Follow up:
What if the linked list is extremely ...
[LeetCode]Linked List Random Node
[LeetCode]Insert Delete GetRandom O(1) - Duplicates allowed
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LeetCode.
题目描述：
LeetCode 381. Insert Delete GetRandom O(1) - Duplicates allowed
Design a data structure that supports all following operations in average O(1) time.
Note: Duplicate elements are allowed.
insert(val): Inserts an item val to the collection.remove(val ...
[LeetCode]Insert Delete GetRandom O(1)
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LeetCode.
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 ...
[LeetCode]Kth Smallest Element in a Sorted Matrix
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题目描述：
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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题目描述：
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 ...