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[Swift]Character extension for competitive programming
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| extension Character { | |
| var ord: UInt32 { | |
| let u = String(self).unicodeScalars | |
| return u[u.startIndex].value | |
| } | |
| var isDigit: Bool { return "0"..."9" ~= self } | |
| var isAlpha: Bool { return "a"..."z" ~= self || "A"..."Z" ~= self } | |
| } |
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