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NewPasswordPolicy.cs
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NewPasswordPolicy.cs
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using System;
using System.Linq;
namespace AdventOfCode.Year2020.Day02;
public struct NewPasswordPolicy : IPasswordPolicy
{
public char Letter { get; }
public int FirstPos { get; }
public int SecondPos { get; }
public NewPasswordPolicy(char letter, int firstPos, int secondPos)
{
Letter = letter;
FirstPos = firstPos;
SecondPos = secondPos;
}
public bool DoesMatch(string password)
{
if (password.Length < FirstPos) return false;
int count = 0;
if (password[FirstPos - 1] == Letter) count++;
if (SecondPos <= password.Length)
{
if (password[SecondPos - 1] == Letter) count++;
}
return count == 1;
}
public static NewPasswordPolicy Parse(string s)
{
string[] parts = s.Split(' ', StringSplitOptions.RemoveEmptyEntries);
if (parts.Length != 2)
{
throw new FormatException($"{nameof(s)} was not in a valid format.");
}
if (parts[1].Length != 1)
{
throw new FormatException($"{nameof(s)} was not in a valid format.");
}
int[] numbers = parts[0].Split('-', StringSplitOptions.TrimEntries).Select(int.Parse).ToArray();
if (numbers.Length != 2)
{
throw new FormatException($"{nameof(s)} was not in a valid format.");
}
return new NewPasswordPolicy(parts[1].Single(), numbers[0], numbers[1]);
}
}