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- Recollect Numbers1700Codeforcesconstructive algorithms
- Recommendations1700Codeforcesdata structuresgreedysortings
- Recover Polygon (easy)1700Codeforces
- Recover an RBS1800Codeforcesconstructive algorithmsgreedyimplementationstrings
- Recover it!1800Codeforcesdfs and similargraphsgreedynumber theory
- Rectangle Puzzle II1700Codeforcesimplementationmath
- Rectangles of Love2071CodeChef
- Recycling Bottles1800Codeforcesdpgeometrygreedyimplementation
- Red Light, Green Light (Easy version)1700Codeforcesbrute forcedfs and similardpgraphs
- Reduce to 12050CodeChef
- Reducing Fractions1800Codeforcesimplementationmathnumber theorysortings
- Refined Product Optimality1700Codeforcesbinary searchdata structuresgreedymath
- Reflect Sort1800Codeforcesnumber theory
- Reformat the String1800Codeforces*special
- Relatively Prime Graph1700Codeforcesbrute forceconstructive algorithmsgraphsgreedy
- Remainders Game1800Codeforceschinese remainder theoremmathnumber theory
- Remove Extra One1700Codeforcesbrute forcedata structuresmath
- Remove and Add1800Codeforces*specialgreedy
- Remove the Substring (hard version)1700Codeforcesbinary searchgreedyimplementationtwo pointers
- Rendez-vous de Marian et Robin1800Codeforcesdfs and similargraphsshortest paths
- Renting Bikes1800Codeforcesbinary searchgreedy
- Report1700Codeforcesdata structuressortings
- Representative Sampling1800Codeforces
- Required Length1700Codeforcesbrute forcedfs and similardphashing
- Rescue Nibel!1800Codeforcescombinatoricsdata structuressortings
- Resource Distribution1700Codeforcesbinary searchimplementationsortings
- Restock2088CodeChef
- Restoration of the Permutation1800Codeforcesgreedy
- Restore Graph1800Codeforcesdfs and similargraphssortings
- Restore the Recipe2196CodeChef
- Retrieve back the Array2134CodeChef
- Rhyme1800Codeforces*specialimplementation
- Ripple-Carry Adder2104CodeChef
- Riverside Curio1700Codeforcesdata structuresdpgreedy
- Road Improvement1800Codeforces*specialdfs and similargraphsgreedy
- Road Optimization1700Codeforcesdp
- Road Reform1800Codeforcesdsugraphsgreedy
- Road Widening1800Codeforcesconstructive algorithmsgreedyimplementation
- Road to Cinema1700Codeforcesbinary searchgreedysortings
- Roads in Chefland2136CodeChef
- Robbers' watch1700Codeforcesbrute forcecombinatoricsdpmath
- Robbery1800Codeforcesgreedy
- Robot Rapping Results Report1800Codeforcesbinary searchdpgraphs
- Robot Vacuum Cleaner1800Codeforcesgreedysortings
- Rock Paper Scissors2013CodeChef
- Rock, Paper, Scissors1800Codeforcesbrute forceconstructive algorithmsflowsgreedy
- Rocket1800Codeforcesbinary searchinteractive
- Root was Built by Love, Broken by Destiny1800Codeforcescombinatoricsdfs and similargraphstrees
- Rorororobot1700Codeforcesbinary searchdata structuresgreedymath
- Rotate the String2056CodeChef
- Rudolf and Imbalance1800Codeforcesbinary searchgreedysortingstwo pointers
- Rudolf and Snowflakes (hard version)1800Codeforcesbinary searchbrute forceimplementationmath
- Rudolph and Mimic1800Codeforcesconstructive algorithmsimplementationinteractive
- Ruler (hard version)1700Codeforcesbinary searchinteractiveternary search
- Running Miles1700Codeforcesbrute forcedpgreedy
- Ryouko's Memory Note1800Codeforcesimplementationmathsortings
- SUM OR2152CodeChef
- Sakurako's Task1800Codeforcesbinary searchgreedymathnumber theory
- Same GCDs1800Codeforcesmathnumber theory
- Santa's Bot1700Codeforcescombinatoricsmathprobabilities