A

Basics / Iterator

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346Moving Average from Data StreamQueue sliding-window design359Logger Rate LimiterHashMap design380Insert Delete GetRandom O(1)Array + HashMap284Peeking IteratorIterator pattern341Flatten Nested List IteratorStack (lazy iterator)900RLE IteratorIterator1352Product of the Last K NumbersPrefix product design1381Design a Stack With Increment OperationStack + lazy update

A

Stream / Sliding Window Design

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362Design Hit CounterQueue (timestamps)1396Design Underground SystemHashMap design1825Finding MK AverageThree multisets + sliding window

A

TreeMap / Timeline Design

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729My Calendar ITreeMap (floor/ceiling)731My Calendar IITreeMap sweep (delta count)1146Snapshot ArrayBinary Search + design2034Stock Price FluctuationTreeMap + HashMap2349Design a Number Container SystemHashMap + TreeMap635Design Log Storage SystemString truncation + sorted scan

A

File System / Trie Design

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1166Design File SystemHashMap + path parsing588Design In-Memory File SystemHashMap + Trie design642Design Search Autocomplete SystemTrie + Heap + Design

A

Multi-DS

0 / 1

895Maximum Frequency StackHashMap + Stack

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