| Sum of k smallest elements in BST | Medium | | |
| Sum of Two Integers | Medium | amazon
apple
facebook
google
hulu | |
| Sum of two numbers using only bitwise operators | Medium | | |
| Task Scheduler | Medium | amazon
apple
bloomberg
facebook
google
microsoft
nutanix
oracle
pinterest
uber
vmware | |
| Top K Frequent Elements | Medium | amazon
apple
bloomberg
bytedance
ebay
facebook
goldman-sachs
google
hulu
linkedin
microsoft
oracle
pocket-gems
snapchat
spotify
uber
vmware
yahoo
yelp | |
| Total sum excluding adjacent of a given node in BST | Medium | | |
| Verify Preorder Serialization of a Binary Tree | Medium | google | |
| Accepted Candidates From the Interviews | Medium | | |
| Active Businesses | Medium | yelp | |
| Add Bold Tag in String | Medium | facebook
google
wish
gusto | |
| Add Two Polynomials Represented as Linked Lists | Medium | | |
| Adding Spaces to a String | Medium | | |
| Alice and Bob Playing Flower Game | Medium | | |
| All People Report to the Given Manager | Medium | amazon
google | |
| Apples & Oranges | Medium | facebook | |
| Apply Bitwise Operations to Make Strings Equal | Medium | | |
| Apply Discount Every n Orders | Medium | facebook | |
| Apply Discount to Prices | Medium | | |
| Apply Operations to Make All Array Elements Equal to Zero | Medium | | |
| Apply Operations to Make String Empty | Medium | | |
| Arrange Table by Gender | Medium | | |
| Average Height of Buildings in Each Segment | Medium | | |
| Avoid Flood in The City | Medium | google | |
| Beautiful Towers II | Medium | | |
| Before and After Puzzle | Medium | clutter | |
| Biggest Window Between Visits | Medium | | |
| Binary Search Tree Iterator II | Medium | | |
| Bitwise OR of All Subsequence Sums | Medium | | |
| Bitwise User Permissions Analysis | Medium | | |
| Boundary of Binary Tree | Medium | adobe
amazon
apple
audible
ebay
google
microsoft
oracle | |
| Break a Palindrome | Medium | expedia
jpmorgan
roblox
vmware | |
| Brightest Position on Street | Medium | | |
| Broken Calculator | Medium | bloomberg
nutanix | |
| Building H2O | Medium | amazon
linkedin | |
| Buildings With an Ocean View | Medium | | |
| Cache With Time Limit | Medium | | |
| Calculate Salaries | Medium | | |
| Calculate the Influence of Each Salesperson | Medium | | |
| Campus Bikes II | Medium | amazon
google | |
| Can Convert String in K Moves | Medium | infosys | |
| Card Flipping Game | Medium | | |
| Change Null Values in a Table to the Previous Value | Medium | | |
| Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree | Medium | amazon | |
| Check if Strings Can be Made Equal With Operations II | Medium | | |
| Check if There is a Path With Equal Number of 0's And 1's | Medium | | |
| Check If Two Expression Trees are Equivalent | Medium | | |
| Check If Word Is Valid After Substitutions | Medium | facebook
nutanix | |
| Check Knight Tour Configuration | Medium | | |
| Circle and Rectangle Overlapping | Medium | google | |
| Class Performance | Medium | | |