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Number theory ~~
18=9+9
19=9+9+1
In test case with number 19 the right answer should be 4, not 3. Because 19 = 16 + 1 + 1 + 1.
And in case with number 18 the right answer should be 3, because 18 = 16 + 1 + 1. Shouldn't it?
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