Calculate the max count of continuous characters : String Util « Data Types « C# / C Sharp






  1. C# / C Sharp
  2. Data Types
  3. String Util

Calculate the max count of continuous characters

    

//GNU General Public License version 2 (GPLv2)
//http://cbasetest.codeplex.com/license
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SDFL.Helper
{
    public class StrHelper
    {
        /// <summary>
        ///  a function to calculate the max count of continuous characters. 
        ///  For example, input abb and it will return 2, input abbbcc and it will return 3, etc..
        /// </summary>
        /// <hirtory>
        ///     [Dylan] 08/17/2009  Fix bug, if max list exist in the end, can't got it. e.g. "affddccccc"
        ///     [Dylan] 08/17/2009  Fix bug, if only one continuous list, and in the end, DupList is null, e.g. "aff"
        ///     [Dylan] 08/17/2009  Fix bug, if only one char. e.g "a"
        /// </hirtory>
        /// <param name="str"></param>
        /// <returns>max count of continuous characters</returns>
        public static Int32 MaxofDupCharacter(string str)
        {
            int length = str.Length;
            bool isDup = false;
            int iPre = 0; 
            int iLatter = 1;
            List<int> DupList = new List<int>();

            // [Dylan] 08/17/2009  Fix bug, if only one char. e.g "a"
            if (str.Length == 1)
                return 1;

            for (int i = 0; i < length -1; i++)
            {
                if (str[iLatter] == str[iPre])
                {
                    isDup = true;
                    // [Dylan] 08/17/2009  Fix bug, if only one continuous list, and in the end, DupList is null, e.g. "aff"
                    if (iLatter == length -1 && DupList.Count == 0)
                    {
                        DupList.Add(iLatter - iPre + 1);
                    }
                    // [Dylan] 08/17/2009  Fix bug, if max list exist in the end, can't got it. e.g. "affddccccc"
                    // if true, it indicate that end region is still a continuous list.
                    if (iPre< iLatter -1)
                    {
                        DupList.Add(iLatter - iPre+1);
                    }
                }
                else
                {
                    if (isDup)
                    {
                        DupList.Add(iLatter - iPre);                        
                    }
                    isDup = false;
                    iPre = iLatter;                 
                }
                iLatter++;
            }
            

            return int.Parse(DupList.Max().ToString());
        }


    }
}








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