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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Plop
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("AZERTYABUIOP");
Console.WriteLine("AZ ER TY AB UI OP");
Console.WriteLine(QuickReplaceAB("AZERTYABUIOP"));
Console.WriteLine("AZERTYUABIOP");
Console.WriteLine("AZ ER TY UA BI OP");
Console.WriteLine(QuickReplaceAB("AZERTYUABIOP"));
Console.ReadKey(true);
}
private static string QuickReplaceAB(string str)
{
StringBuilder sb = new StringBuilder();
int oldpos = 0;
int newpos = 0;
while (str.IndexOf("AB", oldpos) > 0)
{
newpos = str.IndexOf("AB", oldpos);
if (newpos % 2 == 0)
{
sb.Append(str.Substring(oldpos, newpos));
sb.Append("ABAC");
oldpos = newpos + 2;
}
else
{
sb.Append(str.Substring(oldpos, newpos + 1));
oldpos = newpos + 1;
}
}
sb.Append(str.Substring(oldpos));
return sb.ToString();
}
}
} |
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