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I've edited the description to make this clear just in case.
1321 doesn't contain 121. Nowhere in the description does it say to permutate the input.
I don't understand, 1321 also contains palindrome(121) and the test should return False.
In my solution,I have to get all substring until find the palindrome.
So...
It is inefficient.
And that's why I felt amazing.
Your solutions are better~
Thank you!
Crystal translation submitted
because it contains a palindrome :
121! ;)This may be a stupid question - how is 1215 a palindrome? I do not understand this. Is it because 1215 = 5121 is a palindrome?