DSA Sheet

Master DSA, one problem at a time

Hand-picked LeetCode problems that cover 90% of coding interviews — browse by topic or follow the 12-week plan. Check them off as you solve; your progress is shared across both views.

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Array traversalTwo pointersSliding windowPrefix sumsKadane's AlgorithmIn-place modificationMatrix traversalIntervals

Character frequency countingTwo pointersSliding windowString parsingPalindromesAnagramsSubstrings

TraversalSlow and fast pointersCycle detectionReversing a linked listMerging linked listsFinding the middleDummy node techniquePointer manipulation

DFSBFS / level-order traversalPreorderInorderPostorderBinary Search TreesTree height & depthLowest Common AncestorTree constructionTrie insertionPrefix searchWord search

Stack operationsQueue operationsMonotonic stackParentheses matchingExpression evaluationBFS queuesMin/max tracking

Graph representationAdjacency listsBFSDFSConnected componentsCycle detectionTopological sortShortest pathMulti-source BFSUnion FindDijkstra's Algorithm

Base casesRecursive callsBacktrackingSubsetsPermutationsCombinationsMemoizationTabulation1D DP2D DPKnapsackSubsequencesState transitions

Min heapMax heapTop K elementsKth largest / smallestRunning medianMerging sorted dataTwo-heap pattern

HashMapsHashSetsFrequency countingDuplicate detectionValue-to-index mappingGroupingPrefix sum + hashmapCaching seen values

ANDORXORNOTLeft shiftRight shiftChecking bitsSetting bitsClearing bitsXOR cancellationCounting set bits

Bubble SortSelection SortInsertion SortMerge SortQuick SortCounting SortBucket SortCustom comparatorsInterval sorting

Linear searchBinary searchBinary search on sorted arraysBinary search on answerRotated arraysLower boundUpper boundMatrix search

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