Find the length of longest contiguous substring of a string, such that the length of the substring is `2 * N`

digits and the sum of the leftmost `N`

digits is equal to the sum of the rightmost `N`

digits. If there is no such substring, return `0`

.

Imagine the solution function is given the number sequence `13267224`

. For this sequence, the longest palindromic substring which satisfies the constraints is `326722`

. The length of `326722`

is 6.

`(3 + 2 + 6)`

= `(7 + 2 + 2)`

= `11`

The solution function should return `6`

as the correct answer.

Contributed by Murat Sütunç

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