Make your practice count.Sign in to track completed questions across devices. Everything is free to browse.

Interview question tracker

X SDE 2

The 50 highest-frequency questions from all time. Finish the strongest signals first.

One question at a time.

Top questions 50

Done	Question	LeetCode
Mark Minimum Genetic Mutation completed	Minimum Genetic Mutation	Solve
Mark Design Twitter completed	Design Twitter	Solve
Mark Flatten Nested List Iterator completed	Flatten Nested List Iterator	Solve
Mark Invalid Tweets completed	Invalid Tweets	Solve
Mark LRU Cache completed	LRU Cache	Solve
Mark Merge Intervals completed	Merge Intervals	Solve
Mark Trapping Rain Water completed	Trapping Rain Water	Solve
Mark Tweet Counts Per Frequency completed	Tweet Counts Per Frequency	Solve
Mark Alien Dictionary completed	Alien Dictionary	Solve
Mark Best Meeting Point completed	Best Meeting Point	Solve
Mark Binary Gap completed	Binary Gap	Solve
Mark Count Student Number in Departments completed	Count Student Number in Departments	Solve
Mark Count Sub Islands completed	Count Sub Islands	Solve
Mark Customer Placing the Largest Number of Orders completed	Customer Placing the Largest Number of Orders	Solve
Mark Design Authentication Manager completed	Design Authentication Manager	Solve
Mark Design Skiplist completed	Design Skiplist	Solve
Mark Finding the Users Active Minutes completed	Finding the Users Active Minutes	Solve
Mark Flatten 2D Vector completed	Flatten 2D Vector	Solve
Mark Happy Number completed	Happy Number	Solve
Mark Implement Trie (Prefix Tree) completed	Implement Trie (Prefix Tree)	Solve
Mark Insert Delete GetRandom O(1) completed	Insert Delete GetRandom O(1)	Solve
Mark Integer to Roman completed	Integer to Roman	Solve
Mark Investments in 2016 completed	Investments in 2016	Solve
Mark Kth Smallest Element in a Sorted Matrix completed	Kth Smallest Element in a Sorted Matrix	Solve
Mark Lowest Common Ancestor of a Binary Search Tree completed	Lowest Common Ancestor of a Binary Search Tree	Solve
Mark Masking Personal Information completed	Masking Personal Information	Solve
Mark Max Points on a Line completed	Max Points on a Line	Solve
Mark Merge k Sorted Lists completed	Merge k Sorted Lists	Solve
Mark Minimum Elements to Add to Form a Given Sum completed	Minimum Elements to Add to Form a Given Sum	Solve
Mark Minimum Number of Steps to Make Two Strings Anagram completed	Minimum Number of Steps to Make Two Strings Anagram	Solve
Mark Multiply Strings completed	Multiply Strings	Solve
Mark Number of Black Blocks completed	Number of Black Blocks	Solve
Mark Number of Connected Components in an Undirected Graph completed	Number of Connected Components in an Undirected Graph	Solve
Mark One Edit Distance completed	One Edit Distance	Solve
Mark Pascal's Triangle completed	Pascal's Triangle	Solve
Mark Permutation Sequence completed	Permutation Sequence	Solve
Mark Process Tasks Using Servers completed	Process Tasks Using Servers	Solve
Mark Rectangles Area completed	Rectangles Area	Solve
Mark Regular Expression Matching completed	Regular Expression Matching	Solve
Mark Remove All Occurrences of a Substring completed	Remove All Occurrences of a Substring	Solve
Mark Reverse Linked List completed	Reverse Linked List	Solve
Mark The Skyline Problem completed	The Skyline Problem	Solve
Mark Time Needed to Buy Tickets completed	Time Needed to Buy Tickets	Solve
Mark Trapping Rain Water II completed	Trapping Rain Water II	Solve
Mark Tree Node completed	Tree Node	Solve
Mark Validate IP Address completed	Validate IP Address	Solve
Mark Valid Parentheses completed	Valid Parentheses	Solve
Mark Wildcard Matching completed	Wildcard Matching	Solve
Mark Word Break II completed	Word Break II	Solve
Mark Largest Plus Sign completed	Largest Plus Sign	Solve

Showing the 50 highest-frequency questions from 51 reported in this period.