1.Given two int arrays a and b, find if all elements in array b appeared in array a with the same order. A[1, 2, 3]
B[5, -1, 1, 4, 2, 3]
Return true
2.Given a string which contains only “A”, “B” and “”. Replace the “” with “A” or “B”, return all combinations.
Input: “A*B”
Return: [“AAB”, “ABB”].