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Done PreCourse-1 #1991

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Abhinav-Sriharsha
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@Erlybird
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Please check the peek method of 1st problem.

@Erlybird
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Please check the peek method of 1st and 2nd problem. Firstly , you have to check if the stack is empty and then you have return the value of the element, not it's index

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@Erlybird
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Please check the peek method of 1st and 2nd problem. Firstly , you have to check if the stack is empty and then you have return the value of the element, not it's index

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