Determine whether a number is colorful or not. 263 is a colorful number because (2,6,3,2x6,6x3,2x3x6) are all different whereas 236 is not because (2,3,6,2x3,3x6,2x3x6) have 6 twice. So take all consecutive subsets of digits, take their product and ensure all the products are different . Any other approach then O(n^2)
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