CodeSearch
pick a problem · learn it with an AI tutor — hints, not spoilers
37,000 problems · all sources
- Recover a functional graph3400Codeforcesgraph matchings
- Recover the Tree3400Codeforcesconstructive algorithmstrees
- Rectangular Polyline2900Codeforcesconstructive algorithmsdpgeometry
- Red Blue Decomposition3253CodeChef
- Red Blue Tree3500Codeforcesdata structuresimplementationtrees
- Red and Black Tree3000Codeforcesdpimplementationmath
- Red-Black Boolean Expression3025CodeChef
- Red-Black Cobweb2800Codeforcesdata structuresdivide and conquerimplementationtrees
- Red-Blue Graph3400Codeforcesdpgraphsmathmatrices
- Red-Blue Graph2900Codeforcesconstructive algorithmsflows
- Redundant Routes3500Codeforcesconstructive algorithmsdptrees
- Reflection Disorder2953CodeChef
- Reindeer Games3000Codeforcesbinary searchconstructive algorithmsdata structuresdivide and conquer
- Remove Bridges2800Codeforcesdata structuresdfs and similardpgreedy
- Remove Stones2968CodeChef
- Remove the Peaks3162CodeChef
- Replace3500Codeforcesbinary searchdata structures
- Replace All3400Codeforcescombinatoricsdpmath
- Replace and Substring Queries3001CodeChef
- Replace with Coefficients3070CodeChef
- Research3500Codeforcesgames
- Research Rover2900Codeforcescombinatoricsdp
- Restaurant Game3100Codeforces
- Restore the Permutation3037CodeChef
- Restore the Tree2900Codeforcesgraphsgreedytrees
- Restoring Map3200Codeforcesbitmasksconstructive algorithmstrees
- Reunion3200Codeforcescombinatoricsdptrees
- Reverses3300Codeforcesdpstring suffix structuresstrings
- Rin and The Unknown Flower3500Codeforcesconstructive algorithmsgreedyinteractivemath
- Rivalries3400Codeforcesconstructive algorithmsdata structuresgreedy
- Road Repair in Treeland3100Codeforces*specialbinary searchdptrees
- Road Repairs2800Codeforcesdfs and similargraphsgreedy
- Roads2900Codeforces*specialgeometrysortings
- Roads Orientation Problem3200Codeforcesgraphs
- Roads and Flights2927CodeChef
- Roads and Ramen2800Codeforcesdata structurestrees
- Roads in E City3200Codeforcesinteractivemathprobabilitiestrees
- Roads in Yusland2900Codeforcesdata structuresdpgreedy
- Roadside Trees3000Codeforcesdata structuresdp
- Roadworks2900Codeforcesbinary searchdata structuresdpgreedy
- Robots protection2800Codeforcesdata structures
- Roman Routing3373CodeChef
- Room Of Requirement3180CodeChef
- Rotary Laser Lock3500Codeforcesbinary searchinteractive
- Rotate it3081CodeChef
- Rotation Puzzle2924CodeChef
- Royal Flush2800Codeforcesdpimplementation
- Ruler Of The Zoo3500Codeforcesbrute forcedata structures
- Ruminations on Ruminants2900Codeforcesgeometrymath
- SPLIT With XOR Not X3435CodeChef
- Saboteur (Challenge)3763CodeChef
- Safe Routes3198CodeChef
- Santa Delivering Problem3694CodeChef
- Santa's Gift3100Codeforcesdata structurestrees
- Sarthak and his Set of Primes3187CodeChef
- Sasha and Algorithm of Silence's Sounds3200Codeforcesdata structurestrees
- Sasha and a Patient Friend2800Codeforcesbinary searchdata structuresimplementation
- Satanic Panic2900Codeforcesdpgeometry
- Satellites3100Codeforces
- Saturated Subarrays3300CodeChef