48 lines
1.5 KiB
C#
48 lines
1.5 KiB
C#
using System;
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using System.IO;
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using System.Security.Cryptography;
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using System.Text;
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namespace AOC2015
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{
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class Day4Solution : Solution
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{
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public override int Day => 4;
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public override string Name => "Day 4: The Ideal Stocking Stuffer";
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public override void Run()
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{
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string input = "yzbqklnj"; // Puzzle Input
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Console.WriteLine($"Part 1 Answer: {Part1(input)}");
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Console.WriteLine($"Part 2 Answer: {Part2(input)}");
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}
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private int Part1(string input)
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{
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MD5CryptoServiceProvider md5CryptoServiceProvider = new MD5CryptoServiceProvider();
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for (int i = 0; i < int.MaxValue; i++)
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{
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byte[] hashBytes = md5CryptoServiceProvider.ComputeHash(Encoding.ASCII.GetBytes(input + i));
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string hash = BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
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if (hash.StartsWith("00000"))
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return i;
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}
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return -1;
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}
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private int Part2(string input)
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{
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MD5CryptoServiceProvider md5CryptoServiceProvider = new MD5CryptoServiceProvider();
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for (int i = 0; i < int.MaxValue; i++)
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{
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byte[] hashBytes = md5CryptoServiceProvider.ComputeHash(Encoding.ASCII.GetBytes(input + i));
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string hash = BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
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if (hash.StartsWith("000000"))
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return i;
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}
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return -1;
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}
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}
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}
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