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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
namespace Day04
{
class Program
{
private const int lowerBound = 108457;
private const int upperBound = 562041;
static void Main(string[] args)
{
Console.WriteLine("Day 4 - Secure Container");
Console.WriteLine("Star 1");
Console.WriteLine();
int countA = 0;
int countB = 0;
for (int i = lowerBound; i <= upperBound; i++)
{
string value = i.ToString();
if (SatisfiesRulesB(value))
{
if (SatisfiesRulesA(value))
{
countA++;
if (SatisfiesRulesC(value))
{
countB++;
}
}
}
}
Console.WriteLine($"The number of matching passwords is: {countA}");
Console.WriteLine();
Console.WriteLine("Star 2");
Console.WriteLine();
Console.WriteLine($"The new number of matching passwords is: {countB}");
Console.WriteLine();
Console.ReadKey();
}
private static bool SatisfiesRulesA(string value)
{
for (int i = 0; i < value.Length - 1; i++)
{
if (value[i] == value[i + 1])
{
return true;
}
}
return false;
}
private static bool SatisfiesRulesB(string value)
{
for (int i = 0; i < value.Length - 1; i++)
{
if (value[i] > value[i + 1])
{
return false;
}
}
return true;
}
private static bool SatisfiesRulesC(string value)
{
int count = 1;
for (int i = 1; i < value.Length; i++)
{
if (value[i] == value[i-1])
{
count++;
}
else
{
if (count == 2)
{
return true;
}
count = 1;
}
}
return count == 2;
}
}
}
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