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@ -0,0 +1,26 @@ |
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class Program { |
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string num2alpha(int $n) { |
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string $r = ''; |
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for(int $i = 1; $n >= 0 && $i < 10; $i++) { |
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$r = chr(0x41 + ($n % pow(26, $i) / pow(26, $i - 1))) + $r; |
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$n -= pow(26, $i); |
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} |
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return $r; |
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} |
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int alpha2num(string $a) { |
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int $r = 0; |
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int $l = strlen($a); |
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for(int $i = 0; $i < $l; $i++) { |
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$r += pow(26, $i) * (ord($a[$l - $i - 1]) - 0x40); |
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} |
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return (int) $r - 1; |
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} |
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void main() { |
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import('math'); |
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var_dump($this->alpha2num("Salut"), $this->num2alpha(1723), $this->num2alpha(9854), $this->alpha2num("Base64")); |
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} |
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} |