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Use converging two pointers from both ends. When a mismatch is found, try two options: skip the left character or skip the right character. Check if either remaining substring forms a palindrome. If so, the original string is a palindrome with one deletion.
A mismatch gives exactly two recovery options. Only one character can be removed, so trying both skip-left and skip-right covers all possibilities without backtracking.
Updated Mar 2026