Project Euler 387 Harshad Numbers

This is an easy problem.
when we solve problem there are something to be considered.
I will tell you one tip.


1. from small number to Big number
 - problem give us find big number for example sum of over 10^14. just find the answer of smaller number ex) 10^3, 10^4 and check your logic if it is working fine.

I solve this problem by using dp.

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