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stackTail7


Ensure the stack's tail is 7. You may use one auxiliary stack.


stackTail7([1, 4, 9]) → [7, 1, 4, 9]
stackTail7([3, 4, 7, 9]) → [7, 3, 4, 7, 9]
stackTail7([7, 9, 3, 4]) → [7, 9, 3, 4]

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public ArrayList<Integer> stackTail7(ArrayList<Integer> list) { }

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