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classSolution{//Write your code hereprivatevarstack:[Character]=[]privatevarqueue:[Character]=[]funcpushCharacter(ch:Character){stack.append(ch)}funcpopCharacter()->Character{stack.removeLast()}funcenqueueCharacter(ch:Character){queue.append(ch)}funcdequeueCharacter()->Character{queue.removeFirst()}}
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Day 18: Queues and Stacks
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swift solution