372. Super Pow

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Your task is to calculate ab mod 1337 where a is a positive integer and b is an extremely large positive integer given in the form of an array.

Example1:

a = 2
b = [3]

Result: 8


Example2:

a = 2
b = [1,0]

Result: 1024


Credits:
Special thanks to @Stomach_ache for adding this problem and creating all test cases.

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