Day 03 part 1

2018/Day 03/Program.cs

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+using System;
+using System.IO;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.RegularExpressions;
+
+namespace Day_03
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Part1();
+            //Part2();            
+        }
+
+        static void Part1()
+        {
+            // Declare an empty 2D array with 1000x1000 cells, material[x,y] from left and top respectively
+            int[,] material = new int[1000, 1000];
+
+            var lines = File.ReadAllLines("input.txt");
+            // For each line of the input file
+            foreach (var line in lines)
+            {
+                // A claim like #123 @ 3,2: 5x4 means that claim ID 123 specifies a rectangle 3 inches from the left edge, 2 inches from the top edge, 5 inches wide, and 4 inches tall.
+
+                // Remove the id number and everything prior to the left edge measurement 
+                int startIndex = line.IndexOf("@") + 1;
+                int endIndex = line.Length;
+                var lineData = line.Substring(startIndex, endIndex - startIndex);
+
+                // Store all the data 
+                Regex re1 = new Regex(@"(@ [0-9]+,)");
+                var leftPositionList = re1.Matches(line);
+                string leftPosition = leftPositionList[0].Value.Substring(2, leftPositionList[0].Value.Length -1 - 2);
+
+                Regex re2 = new Regex(@"(,[0-9]+:)");
+                var topPositionList = re2.Matches(line);
+                string topPosition = topPositionList[0].Value.Substring(1, topPositionList[0].Value.Length -1 - 1);
+
+                Regex re3 = new Regex(@"(: [0-9]+x)");
+                var widthList = re3.Matches(line);
+                int width = Int32.Parse(widthList[0].Value.Substring(1, widthList[0].Value.Length -1 - 1));
+
+                Regex re4 = new Regex(@"(x[0-9]+)");
+                var lengthList = re4.Matches(line);
+                int length = Int32.Parse(lengthList[0].Value.Substring(1));
+
+                // Store data in all cells horizontally and vertically 
+                for (int i = 0; i < width; i++) {
+                    for (int j = 0; j < length; j++) {
+                        // Store a count of how many times the cell is used at the appropriate co-ordinates
+                        material[(Int32.Parse(leftPosition) + i), (Int32.Parse(topPosition) + j)] += 1; 
+                    }
+                }
+            }
+            
+
+            // Loop through both arrays and count how many cells have a recorded overlap
+            int overlapCounter = 0;
+            for(int i = 0; i < 1000; i++){
+                for(int j = 0; j < 1000; j++){
+                    if(material[i, j] > 1){
+                        overlapCounter += 1; 
+                    }
+                }
+            }
+            Console.WriteLine(material[0, 0]);
+            Console.WriteLine(material.Length);
+            Console.WriteLine("The number of overlapping square inches is " + overlapCounter);
+        }
+
+        static void Part2()
+        {
+           
+        }
+    }
+}