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- RCB vs CSK 282CodeChef
- Race800Codeforcesimplementationmath
- Rain in Chefland328CodeChef
- Rainbow Dash, Fluttershy and Chess Coloring800Codeforcesgreedymath
- Random Pair1174CodeChef
- Range Minimize949CodeChef
- Rating Improvement400CodeChef
- Rating Increase800Codeforcesimplementation
- Ratio By 21035CodeChef
- Reach 5 Star313CodeChef
- Reach Codetown1022CodeChef
- Reach Home395CodeChef
- Reach fast777CodeChef
- Reach on Time279CodeChef
- Reach the Target281CodeChef
- Read Pages343CodeChef
- Rearranging digits to get a multiple of 5949CodeChef
- Rebellion800Codeforcesconstructive algorithmsgreedytwo pointers
- Recent Actions800Codeforcesdata structuresgreedyimplementationmath
- Recent contest problems793CodeChef
- Reconnaissance800Codeforcesbrute force
- Reconnaissance 2800Codeforcesimplementation
- Recover Palindrome825CodeChef
- Recovering a Small String800Codeforcesbrute forcestrings
- Rectangle1146CodeChef
- Rectangle Arrangement800Codeforcesgeometryimplementationmath
- Rectangle Cutting800Codeforcesgeometrymath
- Rectangle and Square144CodeChef
- Rectangled751CodeChef
- Rectangular Tiling1182CodeChef
- Recycling Center800Codeforcesgreedysortings
- Red Light, Green Light984CodeChef
- Red and Blue Beans800Codeforcesmath
- Red and Blue Gems185CodeChef
- Red-Blue Shuffle800Codeforcesmathprobabilities
- Redstone?800Codeforcesbrute forcedata structuresimplementationmath
- Reduce to Single Element Array1150CodeChef
- Regular Bracket Sequences800Codeforcesconstructive algorithms
- Relativity872CodeChef
- Remaining Money167CodeChef
- Remaining Neighborhoods319CodeChef
- Remove Bad elements1100CodeChef
- Remove Duplicates800Codeforcesimplementation
- Remove Prefix800Codeforcesdata structuresgreedyimplementation
- Remove Smallest800Codeforcesgreedysortings
- Remove a Progression800Codeforcesmath
- Reorder800Codeforcesmath
- Repeating Cipher800Codeforcesimplementation
- Replacing Elements800Codeforcesgreedyimplementationmathsortings
- Required Remainder800Codeforcesmath
- Reselling Items903CodeChef
- Restore the Permutation by Merger800Codeforcesgreedy
- Restoring Three Numbers800Codeforcesmath
- Restoring the Duration of Tasks800Codeforcesdata structuresgreedyimplementation
- Restrict Palindromes1133CodeChef
- Retrieve the Array1193CodeChef
- Return the Change763CodeChef
- Reverse800Codeforcesconstructive algorithmsgreedymath
- Reverse The Number588CodeChef
- Reverse a Permutation800Codeforcesgreedy