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apcsaListInsertThrice


Given an ArrayList of Integers and an int val, insert three elements at the beginning. The first has the value of the val parameter, the second has the value 2*val, the third has the value 3*val. Return the modified ArrayList.


apcsaListInsertThrice([0], 4) → [4, 8, 12, 0]
apcsaListInsertThrice([15, 17], 1) → [1, 2, 3, 15, 17]
apcsaListInsertThrice([10, 11], 0) → [0, 0, 0, 10, 11]

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public ArrayList<Integer> apcsaListInsertThrice(ArrayList<Integer> lst, int val) { }

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