Stacks & queues
Use LIFO and FIFO order to match brackets, evaluate expressions, and design small data structures.
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1Valid Parenthesesstack · matchingEasy2Implement Queue using Stacksdesign · stack · queueEasy3Number of Recent CallsqueueEasy4Min Stackdesign · stackMedium5Evaluate Reverse Polish Notationstack · expression evaluationMedium6Decode Stringstack · parsingMedium7Asteroid Collisionstack · simulationMedium8Basic Calculatorstack · expression evaluationHard