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Commit fde3a2f

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Time: 41 ms (21.59%), Space: 16.6 MB (28.21%) - LeetHub
1 parent fe2d5e7 commit fde3a2f

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class Solution:
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def nearestPalindromic(self, n: str) -> str:
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length = len(n)
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num = int(n)
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# Edge cases for very small numbers
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if num == 0:
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return "1"
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if num == 1:
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return "0"
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# Handle corner cases like "1000", "999"
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candidates = set()
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candidates.add(str(10**(length - 1) - 1)) # largest number with one less digit (e.g., 999 for 1000)
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candidates.add(str(10**length + 1)) # smallest number with one more digit (e.g., 10001 for 9999)
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# Generate the palindrome by mirroring
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prefix = int(n[:(length + 1) // 2])
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for i in [-1, 0, 1]:
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new_prefix = str(prefix + i)
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if length % 2 == 0:
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candidate = new_prefix + new_prefix[::-1]
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else:
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candidate = new_prefix + new_prefix[:-1][::-1]
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candidates.add(candidate)
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# Remove the original number from the candidates
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candidates.discard(n)
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# Find the closest palindrome
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closest = min(candidates, key=lambda x: (abs(int(x) - num), int(x)))
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return closest

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