| Find the Closest Marked Node | Medium | | |
| Find the Count of Numbers Which Are Not Special | Medium | | |
| Find the Derangement of An Array | Medium | amazon
ixl | |
| Find the Grid of Region Average | Medium | | |
| Find the Index of the Large Integer | Medium | amazon | |
| Find the Integer Added to Array II | Medium | | |
| Find The K-th Lucky Number | Medium | | |
| Find the Lexicographically Smallest Valid Sequence | Medium | | |
| Find the Longest Equal Subarray | Medium | | |
| Find the Longest Semi-Repetitive Substring | Medium | | |
| Find the Maximum Length of Valid Subsequence I | Medium | | |
| Find the Maximum Length of Valid Subsequence II | Medium | | |
| Find the Maximum Number of Elements in Subset | Medium | | |
| Find the Missing IDs | Medium | | |
| Find the Number of Ways to Place People I | Medium | | |
| Find the Sequence of Strings Appeared on the Screen | Medium | | |
| Finding the Number of Visible Mountains | Medium | | |
| First Unique Number | Medium | amazon | |
| Fizz Buzz Multithreaded | Medium | | |
| Flatten Deeply Nested Array | Medium | | |
| Flip Binary Tree To Match Preorder Traversal | Medium | bloomberg | |
| Flower Planting With No Adjacent | Medium | linkedin | |
| Four Divisors | Medium | capital-one | |
| Frequency Tracker | Medium | | |
| Friends With No Mutual Friends | Medium | | |
| Game of Nim | Medium | google | |
| Game Play Analysis III | Medium | gsn-games | |
| Generate Circular Array Values | Medium | | |
| Global and Local Inversions | Medium | amazon | |
| Group By | Medium | | |
| Group the People Given the Group Size They Belong To | Medium | roblox | |
| Happy Students | Medium | | |
| High-Access Employees | Medium | | |
| Highest Grade For Each Student | Medium | coursera | |
| House Robber 4 | Medium | | |
| Implement Magic Dictionary | Medium | facebook
google
microsoft | |
| Implement Trie II (Prefix Tree) | Medium | | |
| Increment Submatrices by One | Medium | | |
| Insert into a Sorted Circular Linked List | Medium | amazon
bloomberg
facebook
google
microsoft
quip | |
| Insufficient Nodes in Root to Leaf Paths | Medium | amazon | |
| Intervals Between Identical Elements | Medium | | |
| Investments in 2016 | Medium | twitter | |
| Jump Game 3 | Medium | microsoft | |
| K Highest Ranked Items Within a Price Range | Medium | | |
| K-diff Pairs in an Array | Medium | amazon
bloomberg
goldman-sachs
microsoft
oracle
paypal
salesforce
twilio
twitter | |
| K-th Nearest Obstacle Queries | Medium | | |
| Largest Element in an Array after Merge Operations | Medium | | |
| Largest Magic Square | Medium | | |
| Largest Number After Mutating Substring | Medium | | |
| Largest Submatrix With Rearrangements | Medium | | |