Please update the rust version.

You have to look for harshad numbers, where the product of "sum of digits" and "sum of digits"[::-1] is the number again. Now lets have a look at the sum of digits.

9: you need at least 1 digit to get this. And 9 * 9 = 81 (2 digits). No problem.

99: you need at least 11 digits to get this. And 99 * 99 is < 10.000 (4 digits). For bigger numbers this is getting worse, so the matching harshad numbers are below 10.000. And there we have just these four numbers...

Since Option implements IntoIterator you could use "Some('_')" instead of "std::iter::once('_')"

Approved

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Thank you

Thank you, I changed this

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Please update the rust version

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Very impressive!

I get this warning: unused imports: 'Rng', 'thread_rng'

@PG1: rust version updated

Absolutely stunning! This is why I like codewars. After committing my solution I nearly always see other solutions much smaller and/or much cleaner and/or much better. Thank you!

Thank you, updated to Rust 1.62