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Leetcode 3260. Find the Largest Palindrome Divisible by K
Find the largest n-digit palindrome (no leading zeros) divisible by k and return it as a string; with n up to 1e5 and k ≤ 9, the core challenge is to construct the lexicographically largest palindrome by selecting the first half and using modular arithmetic to adjust digits so the full palindrome is divisible by k while operating on very long strings.
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