32 lines
823 B
D
32 lines
823 B
D
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import std;
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void main()
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{
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auto passwords = slurp!(ulong, ulong, char, string)("input", "%s-%s %s: %s");
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passwords.findNumberOfValidPasswords.writeln;
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}
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alias PasswordWithPolicy = Tuple!(ulong, ulong, char, string);
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ulong findNumberOfValidPasswords(PasswordWithPolicy[] passwords)
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{
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return passwords.filter!(password => password.isPasswordValid).count;
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}
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bool isPasswordValid(PasswordWithPolicy password)
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{
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immutable numberOfRequiredLetter = password[3].byChar.filter!(c => c == password[2]).count;
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return numberOfRequiredLetter >= password[0] && numberOfRequiredLetter <= password[1];
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}
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unittest
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{
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auto input = [
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tuple(1UL, 3UL, 'a', "abcde"),
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tuple(1UL, 3UL, 'b', "cdefg"),
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tuple(2UL, 9UL, 'c', "ccccccccc")
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];
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assert(input.findNumberOfValidPasswords == 2);
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}
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