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- Pumping Lemma3000Codeforceshashingstrings
- Pumping Stations2900Codeforcesbrute forcedfs and similardivide and conquerflows
- Puppy and Triangles3481CodeChef
- Purify It3198CodeChef
- Push the Flow!3012CodeChef
- Pushing Robots3500Codeforces
- Puzzle Lover3200Codeforcesdphashingstrings
- Qingshan and Daniel3200Codeforcesbrute forcedata structuresgreedyimplementation
- Quadratic Set2900Codeforcesconstructive algorithmshashingmathnumber theory
- Quantifier3300Codeforcescombinatoricsdpimplementation
- Quasi-Polynomial Sum3276CodeChef
- Queen of Hearts2992CodeChef
- Queries With Points3021CodeChef
- Query Jungle2900Codeforcesdata structuresimplementationmathmatrices
- Querying on a Grid3049CodeChef
- Quest for Dragon Balls3255CodeChef
- Quick Exit (Counting)3299CodeChef
- Quick Tortoise3000Codeforcesbitmasksdivide and conquerdp
- RC Kaboom Show2900Codeforcesbinary searchbrute forcedata structuresgeometry
- RGB Grid (Hard)3028CodeChef
- RGB Walking3500Codeforcesbitmaskschinese remainder theoremdfs and similargraphs
- Racing Dead2943CodeChef
- Radix sum3400Codeforcesfftmathnumber theory
- Raffles3100Codeforcesdata structuresdpgreedymath
- Raging Thunder2800Codeforcesdata structuresdivide and conquerimplementation
- Railway Construction3300Codeforces
- Railway Construction3400Codeforcesbrute forceconstructive algorithmsdata structuresgraphs
- Rain Protection3500Codeforcesbinary searchgeometry
- Rain of Fire2800Codeforcesbinary searchdata structuresdfs and similardsu
- Rainbow Balls2800Codeforcesmath
- Rainbow Branch3200Codeforcesconstructive algorithmsdpgreedytrees
- Rainbow Coins3000Codeforcesinteractive
- Rainbow Rectangles3300Codeforcesdata structuressortingstwo pointers
- Rainbow Triples3300Codeforcesbinary searchdata structuresflowsgreedy
- Raining season3200Codeforcesdata structuresdivide and conquertrees
- Random Coloring3550CodeChef
- Random Convex Hull3281CodeChef
- Random Elections2800Codeforcesbitmasksbrute forcedivide and conquerfft
- Random Forest Rank2800Codeforcesdpgraph matchingsmathtrees
- Random Input Problem3248CodeChef
- Random Knapsack2998CodeChef
- Random Number Generator2908CodeChef
- Random Permutation3432CodeChef
- Random Ranking3000Codeforcesdpmathprobabilities
- Random Walk Queries2938CodeChef
- Randomizer2800Codeforcescombinatoricsgeometryprobabilities
- Range Diameter Sum3500Codeforcesdata structurestrees
- Range Maximum Deconstruction (Hard)2927CodeChef
- Rap God3400Codeforcesdata structuresdfs and similarhashingstrings
- Rational Bubble Sort2900Codeforcesconstructive algorithmsgeometrygreedy
- Ratist Behaviour3244CodeChef
- Rayan vs. Rayaneh3300Codeforcesbrute forcedfs and similardpnumber theory
- Reality Show2800Codeforcesbitmasksdp
- Reaper Reaps3201CodeChef
- Rearrange2800Codeforcesbrute forceconstructive algorithmsgraphsgreedy
- Rearrangement3310CodeChef
- Rebel rescue3154CodeChef
- Recipe for Philosopher Stone3044CodeChef
- Reclamation2900Codeforcesdsu
- Recover The Array3145CodeChef