Check If Digits Are Equal in String After Operations I: coding question

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Repeatedly replace the string with the sequence of sums (mod 10) of each adjacent digit until only two digits remain, and return whether those final two digits are equal.

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Leetcode 3461. Check If Digits Are Equal in String After Operations I
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Check If Digits Are Equal in String After Operations I

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Check If Digits Are Equal in String After Operations I

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