Triangle

traingle.cs

using System;
using System.IO;

//  NOTE: Incorrect solution
//  Triangle
//  By starting at the top of the triangle and moving to adjacent numbers on the row below, the maximum total from top to bottom is 27.

//          5
//        9  6
//      4   6  8
//    0   7  1   5

//  I.e. 5 + 9 + 6 + 7 = 27.

//  Write a program in a language of your choice to find the maximum total from top to bottom in triangle.txt, a text file containing a triangle with 100 rows.

namespace Triangle
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string currentLine;
            int sum = 0;
            
            try 
            {
                using(StreamReader reader = new StreamReader("input.txt")) 
                {
                    currentLine = reader.ReadLine();
                                       
                    sum += Int32.Parse(currentLine);
                    int currentLineNumber = 1;
                    
                    while ((currentLine = reader.ReadLine()) != null)
                    {                        
                        currentLine = currentLine.Trim();
                        
                        currentLineNumber++;
                        
                        var numbersInStringForm = currentLine.Split(' ');
                        var numbers = new int[numbersInStringForm.Length];
                        
                        for(int i = 0; i < numbers.Length; i++) 
                        {
                            numbers[i] = Int32.Parse(numbersInStringForm[i]);
                        }
                        
                        int mid = numbers.Length / 2;
                        if (currentLineNumber % 2 == 0) 
                        {
                            sum += numbers[mid - 1]; 
                        } else 
                        {
                            sum += numbers[mid];
                        }
                    }
                }
                
                Console.WriteLine("Sum is {0}", sum);
            }
            catch(Exception e)
            {
                Console.WriteLine("The file could not be read: ");
                Console.WriteLine(e.Message);
            }
        }
    }
}