mirror of
https://github.com/HenkKalkwater/aoc-2020
synced 2024-11-23 03:25:17 +00:00
28 lines
579 B
D
28 lines
579 B
D
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import std.algorithm;
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import std.format;
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import std.stdio;
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import dayutil;
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bool isPasswordValid(T)(T line) {
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int min, max;
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char c;
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string password;
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line.formattedRead("%d-%d %c: %s", min, max, c, password);
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ulong charCount = password.count(c);
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return min <= charCount && charCount <= max;
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}
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void run(string[] args) {
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ulong count = stdin.byLine
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.count!(l => isPasswordValid(l));
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writeln(count);
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}
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unittest {
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assert(isPasswordValid("1-3 a: abcde") == true);
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assert(isPasswordValid("1-3 b: cdefg") == false);
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assert(isPasswordValid("2-9 c: ccccccccc") == true);
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}
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