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My solution gives wrong answer to test case #3 but succeeds on others. Either I treat an invalid character as valid or vice versa. I only accept alphanumeric characters, spaces (not other whitespaces), brackets (no square brackets, not braces), and the punctuation characters specified in the description: (;:,.'?-!). What could be the problem?
Project Euler #59: XOR decryption
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My solution gives wrong answer to test case #3 but succeeds on others. Either I treat an invalid character as valid or vice versa. I only accept alphanumeric characters, spaces (not other whitespaces), brackets (no square brackets, not braces), and the punctuation characters specified in the description: (;:,.'?-!). What could be the problem?