| Remove Duplicate Letters | Open ↗ |
| Remove Duplicates From an Unsorted Linked List | Open ↗ |
| Remove Duplicates from Sorted Array | Open ↗ |
| Remove Duplicates from Sorted Array II | Open ↗ |
| Remove Duplicates from Sorted List | Open ↗ |
| Remove Duplicates from Sorted List II | Open ↗ |
| Remove Element | Open ↗ |
| Remove Interval | Open ↗ |
| Remove Invalid Parentheses | Open ↗ |
| Remove K-Balanced Substrings | Open ↗ |
| Remove K Digits | Open ↗ |
| Remove Letter To Equalize Frequency | Open ↗ |
| Remove Linked List Elements | Open ↗ |
| Remove Max Number of Edges to Keep Graph Fully Traversable | Open ↗ |
| Remove Methods From Project | Open ↗ |
| Remove Nodes From Linked List | Open ↗ |
| Remove Nth Node From End of List | Open ↗ |
| Remove One Element to Make the Array Strictly Increasing | Open ↗ |
| Remove Outermost Parentheses | Open ↗ |
| Remove Palindromic Subsequences | Open ↗ |
| Remove Stones to Minimize the Total | Open ↗ |
| Remove Sub-Folders from the Filesystem | Open ↗ |
| Remove Vowels from a String | Open ↗ |
| Remove Zero Sum Consecutive Nodes from Linked List | Open ↗ |
| Removing Minimum Number of Magic Beans | Open ↗ |
| Removing Stars From a String | Open ↗ |
| Reorder Data in Log Files | Open ↗ |
| Reordered Power of 2 | Open ↗ |
| Reorder List | Open ↗ |
| Reorder Routes to Make All Paths Lead to the City Zero | Open ↗ |
| Reorganize String | Open ↗ |
| Repeated DNA Sequences | Open ↗ |
| Repeated String Match | Open ↗ |
| Repeated Substring Pattern | Open ↗ |
| Replace All Digits with Characters | Open ↗ |
| Replace All ?'s to Avoid Consecutive Repeating Characters | Open ↗ |
| Replace Elements in an Array | Open ↗ |
| Replace Elements with Greatest Element on Right Side | Open ↗ |
| Replace Employee ID With The Unique Identifier | Open ↗ |
| Replace Non-Coprime Numbers in Array | Open ↗ |
| Replace Question Marks in String to Minimize Its Value | Open ↗ |
| Replace the Substring for Balanced String | Open ↗ |
| Replace Words | Open ↗ |
| Report Contiguous Dates | Open ↗ |
| Reported Posts | Open ↗ |
| Reported Posts II | Open ↗ |
| Report Spam Message | Open ↗ |
| Reschedule Meetings for Maximum Free Time I | Open ↗ |
| Reschedule Meetings for Maximum Free Time II | Open ↗ |
| Reshape Data: Concatenate | Open ↗ |
| Reshape Data: Melt | Open ↗ |
| Reshape Data: Pivot | Open ↗ |
| Reshape the Matrix | Open ↗ |
| Restaurant Growth | Open ↗ |
| Restore Finishing Order | Open ↗ |
| Restore IP Addresses | Open ↗ |
| Restore The Array | Open ↗ |
| Restore the Array From Adjacent Pairs | Open ↗ |
| Resulting String After Adjacent Removals | Open ↗ |
| Return Length of Arguments Passed | Open ↗ |
| Reveal Cards In Increasing Order | Open ↗ |
| Reverse Bits | Open ↗ |
| Reverse Degree of a String | Open ↗ |
| Reverse Integer | Open ↗ |
| Reverse Linked List | Open ↗ |
| Reverse Linked List II | Open ↗ |
| Reverse Nodes in Even Length Groups | Open ↗ |
| Reverse Nodes in k-Group | Open ↗ |
| Reverse Odd Levels of Binary Tree | Open ↗ |
| Reverse Only Letters | Open ↗ |
| Reverse Pairs | Open ↗ |
| Reverse Prefix of Word | Open ↗ |
| Reverse String | Open ↗ |
| Reverse String II | Open ↗ |
| Reverse String Prefix | Open ↗ |
| Reverse Substrings Between Each Pair of Parentheses | Open ↗ |
| Reverse Vowels of a String | Open ↗ |
| Reverse Words in a String | Open ↗ |
| Reverse Words in a String II | Open ↗ |
| Reverse Words in a String III | Open ↗ |
| Reward Top K Students | Open ↗ |
| Richest Customer Wealth | Open ↗ |
| Right Triangles | Open ↗ |
| Rings and Rods | Open ↗ |
| Rising Temperature | Open ↗ |
| RLE Iterator | Open ↗ |
| Robot Bounded In Circle | Open ↗ |
| Robot Collisions | Open ↗ |
| Robot Return to Origin | Open ↗ |
| Robot Room Cleaner | Open ↗ |
| Roman to Integer | Open ↗ |
| Root Equals Sum of Children | Open ↗ |
| Rotate Array | Open ↗ |
| Rotated Digits | Open ↗ |
| Rotate Function | Open ↗ |
| Rotate Image | Open ↗ |
| Rotate List | Open ↗ |
| Rotate Non Negative Elements | Open ↗ |
| Rotate String | Open ↗ |
| Rotating the Box | Open ↗ |