Question 1

Insert Delete GetRandom O(1) — X Interview Question

Accepted Answer

"Insert Delete GetRandom O(1)" is a medium difficulty problem asked at X interviews. It covers the following topics: Array, Hash Table, Math, Design, Randomized. You can practice it on LeetCode: https://leetcode.com/problems/insert-delete-getrandom-o1

Question 2

Flatten Nested List Iterator — X Interview Question

Accepted Answer

"Flatten Nested List Iterator" is a medium difficulty problem asked at X interviews. It covers the following topics: Stack, Tree, Depth-First Search, Design, Queue, Iterator. You can practice it on LeetCode: https://leetcode.com/problems/flatten-nested-list-iterator

Question 3

Trapping Rain Water — X Interview Question

Accepted Answer

"Trapping Rain Water" is a hard difficulty problem asked at X interviews. It covers the following topics: Array, Two Pointers, Dynamic Programming, Stack, Monotonic Stack. You can practice it on LeetCode: https://leetcode.com/problems/trapping-rain-water

Question 4

Design Twitter — X Interview Question

Accepted Answer

"Design Twitter" is a medium difficulty problem asked at X interviews. It covers the following topics: Hash Table, Linked List, Design, Heap (Priority Queue). You can practice it on LeetCode: https://leetcode.com/problems/design-twitter

Question 5

Tweet Counts Per Frequency — X Interview Question

Accepted Answer

"Tweet Counts Per Frequency" is a medium difficulty problem asked at X interviews. It covers the following topics: Hash Table, Binary Search, Design, Sorting, Ordered Set. You can practice it on LeetCode: https://leetcode.com/problems/tweet-counts-per-frequency

Question 6

Merge Intervals — X Interview Question

Accepted Answer

"Merge Intervals" is a medium difficulty problem asked at X interviews. It covers the following topics: Array, Sorting. You can practice it on LeetCode: https://leetcode.com/problems/merge-intervals

#	Question Title	Difficulty	Frequency	Topics
1	Insert Delete GetRandom O(1)	MEDIUM	100.0	ArrayHash TableMath+2
2	Flatten Nested List Iterator	MEDIUM	96.3	StackTreeDepth-First Search+3
3	Trapping Rain Water	HARD	96.3	ArrayTwo PointersDynamic Programming+2
4	Design Twitter	MEDIUM	94.2	Hash TableLinked ListDesign+1
5	Tweet Counts Per Frequency	MEDIUM	94.2	Hash TableBinary SearchDesign+2
6	Merge Intervals	MEDIUM	94.2	ArraySorting
7	Implement Trie (Prefix Tree)	MEDIUM	94.2	Hash TableStringDesign+1
8	Best Meeting Point	HARD	91.9	ArrayMathSorting+1
9	LRU Cache	MEDIUM	91.9	Hash TableLinked ListDesign+1
10	Investments in 2016	MEDIUM	91.9	Database

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