initial add to repository

2018_02/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace _2018_02
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            int twos = 0, threes = 0;
+
+            Dictionary<string, int> resCheck = new Dictionary<string, int>();
+            string indata = File.ReadAllText(@"I:\Adventofcode_181201\data181202.txt");
+            //string indata = "abcdef\r\nbababc\r\nabbcde\r\nabcccd\r\naabcdd\r\nabcdee\r\nababab\r\n";
+
+            string[] resTab = indata.Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
+
+            foreach (var boxId in resTab)
+            {
+                char[] characters = boxId.ToArray();
+                Array.Sort(characters);
+                analyseString(characters, ref twos, ref threes);
+
+
+            }
+
+            System.Console.WriteLine($"twos: {twos} threes: {threes}  checksum: {twos * threes} ");
+
+            SecondAnalyse(resTab);
+
+
+        }
+
+
+        private static void analyseString(char[] characters, ref int twos, ref int threes)
+        {
+            int locTwos = 0, locthrees = 0;
+            char lastChar = ' ';
+            byte cnt = 0;
+            foreach (var tkn in characters)
+            {
+                if (tkn == lastChar)
+                {
+                    cnt++;
+                }
+                else
+                {
+                    if (cnt == 2)
+                    {
+                        if (locTwos == 0)
+                            locTwos++;
+                    }
+                    if (cnt == 3)
+                    {
+                        if (locthrees == 0)
+                        {
+                            locthrees++;
+                        }
+                    }
+                    lastChar = tkn;
+                    cnt = 1;
+                }
+            }
+            if (cnt == 2)
+            {
+                if (locTwos == 0)
+                    locTwos++;
+            }
+            if (cnt == 3)
+            {
+                if (locthrees == 0)
+                {
+                    locthrees++;
+                }
+            }
+
+            twos += locTwos;
+            threes += locthrees;
+        }
+
+        private static void SecondAnalyse(string[] restab)
+        {
+            bool ready = false;
+            var xlen = restab[0].Length;
+
+            foreach (var str in restab)
+            {
+                for (int i = 0; i < xlen; i++)
+                {
+                    foreach (var str2 in restab)
+                    {
+                        if (str2 == str) { }
+                        else
+                        {
+                            string stx = "", sty = "";
+                            var st0 = stringUtanPos(str, i, out stx);
+                            var st1 = stringUtanPos(str2, i, out sty);
+                            if (st0 == st1)
+                            {
+                                System.Console.WriteLine($"box 1: {str},\r\nbox 2: {str2} diff chars {stx} , {sty}\r\n{st0}\r\n{st1}");
+                                ready = true;
+                                break;
+                            }
+
+
+                        }
+                        if (ready) break;
+                    }
+                    if (ready) break;
+                }
+                if (ready) break;
+            }
+
+
+
+        }
+
+        private static string stringUtanPos(string str, int i, out string stx)
+        {
+            string tmp = str;
+            stx = str.Substring(i, 1);
+            if (i > 0)
+            {
+                tmp = str.Substring(0, i) + str.Substring(i + 1);
+            }
+            else
+            {
+                tmp = str.Substring(i+1);
+            }
+
+            return tmp;
+        }
+    }
+}