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DSA & SQL Practice Problems

285 problems across 30+ patterns. Filter by type, difficulty, or pattern — then solve with instant judging and spaced-repetition tracking.

Showing 25 of 285 problems

TitlePatternDifficultySolved by
#1Duplicate Submission DetectordsaArrays & Hashingeasy0
#2Pair Programming MatchdsaArrays & Hashingeasy0
#3Anagram VerifierdsaArrays & Hashingeasy0
#4Note from NewspaperdsaArrays & Hashingeasy0
#5First Non-Repeating LetterdsaArrays & Hashingeasy0
#6Election MajoritydsaArrays & Hashingeasy0
#7Missing Roll NumbersdsaArrays & Hashingeasy0
#8Common Items in Two ListsdsaArrays & Hashingeasy0
#9Treasures in the SanddsaArrays & Hashingeasy0
#10Distinct Tally MarksdsaArrays & Hashingeasy0
#11Equal-Value PairsdsaArrays & Hashingeasy0
#12Running TallydsaArrays & Hashingeasy0
#13Subarray with Target SumdsaArrays & Hashingmedium0
#14Product of All OthersdsaArrays & Hashingmedium0
#15Longest Consecutive RundsaArrays & Hashingmedium0
#16Palindrome After CleanupdsaTwo Pointerseasy0
#17Reverse the String In PlacedsaTwo Pointerseasy0
#18Push Empty Slots to the EnddsaTwo Pointerseasy0
#19Merge Two Sorted LogsdsaTwo Pointerseasy0
#20Compact Sorted DuplicatesdsaTwo Pointerseasy0
#21Filter Out a ValuedsaTwo Pointerseasy0
#22Pair Sum in Sorted RosterdsaTwo Pointerseasy0
#23Subsequence CheckdsaTwo Pointerseasy0
#24Sorted Squared DistancesdsaTwo Pointerseasy0
#25Evens Then OddsdsaTwo Pointerseasy0