Problem library
45 problems, all original
Every problem here shows up in battles too. Warm up on one now, or battle a friend on it later.
Solved 0 Quick warm-up
- EasyBadge Maskbit manipulation Warm up
- EasyCombo Damagearrays · simulation Warm up
- EasyEmote Countstrings Warm up
- EasyFastest Laparrays Warm up
- EasyHealth Barsimulation Warm up
- EasyIsland Countmatrix · flood fill Warm up
- EasyLatency Spikesarrays Warm up
- EasyLeaderboard Ranksorting · arrays Warm up
- EasyMirror Tagstrings · two pointers Warm up
- EasyMVP Votehash map · counting Warm up
- EasyPeak Lobbysweep line · sorting Warm up
- EasyRating Tierconditionals Warm up
- EasyReplay Compressstrings · run length Warm up
- EasyRoster Ordersorting Warm up
- EasyRound Totalsprefix sums Warm up
- EasyUnpaired Playerbit manipulation · hash map Warm up
- EasyWin Streakstrings · counting Warm up
- MediumBracket Orderrecursion · arrays Warm up
- MediumChat Slow Modequeue · sliding window Warm up
- MediumEnergy Budgetsliding window Warm up
- MediumFair Pairsgreedy · sorting · two pointers Warm up
- MediumFastest Lapsheap · k-way merge Warm up
- MediumFriend Groupsgraphs · union find Warm up
- MediumHandle Prefixestrie · strings Warm up
- MediumLoot Ledgerhash map · sorting Warm up
- MediumMatch Refereesimulation · state machine Warm up
- MediumMerge Sessionsintervals · sorting Warm up
- MediumRating Waitmonotonic stack Warm up
- MediumRound Robin Tablehash map · sorting Warm up
- MediumSafest Routegraphs · shortest path Warm up
- MediumShop Changedynamic programming Warm up
- MediumSpiral Scanmatrix · simulation Warm up
- MediumTop Playerssorting Warm up
- MediumUnlock Ordergraphs · topological sort Warm up
- MediumUpload Ratebinary search Warm up
- MediumZone Boostsdifference array · prefix sums Warm up
- HardBreach Rungraphs · bfs Warm up
- HardClimb Streakdynamic programming · binary search Warm up
- HardEcho Detectorstrings · hashing · binary search Warm up
- HardPrize Scheduledynamic programming · binary search Warm up
- HardQuest Deadlinesgreedy · heap Warm up
- HardShielded Rundynamic programming · matrix Warm up
- HardSquad Rolesbit masks · dynamic programming Warm up
- HardTag Distancedynamic programming · strings Warm up
- HardTeam Splitdynamic programming · subset sum Warm up
Want to add a problem? The library is open source and every problem comes with tests in two languages.
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