Test, C# - rextester

Language: Layout:

// a: [9, 8, 8, 5, 3, 5, 3, 2, 8, 6]
// 4
// a: [4, 4]
// 1
// a: [2, 1, 4, 4, 1, 4, 4, 1, 2, 0, 1, 0, 0, 3, 1, 3, 4, 1, 3, 4]
// 6

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var input = new int[] { 9, 8, 8, 5, 3, 5, 3, 2, 8, 6 };
            //Console.WriteLine("Result: {0}", zigzag(input));
            Console.WriteLine("\nResult: {0}", zigzagNew(input));
        }
        public static int zigzag(int[] a) 
        {
            if (a.Length == 0)
                return 0;
            if (a.Length < 3)
                return 1;
            
            var result = 0;
            var maxresult = 0;
            for (int i = 0; i < a.Length; i++)
            {
                if (i > 0 && i < a.Length-1)
                {
                    var l = a[i-1];
                    var m = a[i];
                    var r = a[i+1];
                    
                    Console.Write("{0})  l: {1}  m: {2}  r: {3}\t\t", i, l, m, r);

if ((m < l) && (m < r))
                        result++;
                    else if ((m > l) && (m > r))
                        result++;
                    else
                    {
                        result = 0;
                    }
                    if (result == 1)
                        result = 3;
                    
                    if (maxresult < result)
                        maxresult = result;

Console.Write("Max: {1}  Res: {2}", i, maxresult, result);
                    
                    if (result == 0)
                        Console.Write("\t\tReset");
                    
                    Console.WriteLine();
                }
            }
            if (maxresult > result)
                result = maxresult;

return result;
        }
        
        public static int zigzagNew(int[] a) 
        {
            var result = 0;
            var maxresult = 0;
            var sign = '=';
            var prev = '=';
            
            for (int i = 0; i < a.Length; i++)
            {
                if (i > 0)
                {
                    if (a[i-1] > a[i])
                        sign = '>';
                    else if (a[i-1] < a[i])
                        sign = '<';
                    else
                        sign = '=';

if (prev == '=')
                        result++;
                    else if (prev != sign)
                        result++;
                    else
                        result = 1;

prev = sign;
                        
                    if (maxresult < result)
                        maxresult = result;
                        
                    Console.WriteLine("{0} {1} {2} : {3}", a[i-1], sign, a[i], result);
                }
                
                
                /*
                if (i > 0 && i < a.Length-1)
                {
                    var l = a[i-1];
                    var m = a[i];
                    var r = a[i+1];
                    
                    Console.Write("{0})  l: {1}  m: {2}  r: {3}\t\t", i, l, m, r);

if ((m < l) && (m < r))
                    {
                        result++;
                        lastpos = i;
                    }
                    else if ((m > l) && (m > r))
                    {
                        result++;
                        lastpos = i;
                    }
                    else
                    {
                        result = 0;
                    }
                    
                    if (result == 1)
                        result = 3;
                    
                    if (maxresult < result)
                        maxresult = result;

Console.Write("Max: {1}  Res: {2}", i, maxresult, result);
                    
                    if (result == 0)
                        Console.Write("\t\tReset");
                    
                    Console.WriteLine();
                }
                */
            }
            /*
            Console.WriteLine("Lastpos: {0}  Length: {1}", lastpos, a.Length);
            if (lastpos == a.Length)
                result++;
            
            if (maxresult > result)
                result = maxresult;
            */
            return result;
        }
        
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,17 sec, cpu time: 0,09 sec, average memory usage: 19 Mb, average nr of threads: 4