Character interception (a bit difficult)

梦幻流星

How to repeatedly remove such strings "aa, bb, cc, dd, aa, bb, cc, dd" into "aa, bb, cc, dd"
It's very difficult, I hope the experts will help me, thank you

xing_532

In "aa, bb, cc, dd, aa, bb, cc, dd", go to the string before the first "," and loop to find the next one, and replace "aa," or "aa" with "", you will get a new string, repeat the above, find the next

ymooner

protected void Page_Load( object sender, EventArgs e)
  {
    string a = "aa,bb,cc,dd,aa,bb,cc,dd";
    string[] arr = a.Split(',');
    string[] b = RemoveDups(arr, true);
    for (int i = 0; i <b.Length; i++)
    {
      Response.Write("<li>" + b[i]);
    }
  }
  public string[] RemoveDups( string[] items, bool sort)
  {
    ArrayList noDups = new ArrayList();
    for (int i = 0; i <items.Length; i++)
    {
      if (!noDups.Contains(items[i].Trim()))
      {
        noDups.Add(items[i].Trim());
      }
    }
    if (sort) noDups.Sort();
    string[] uniqueItems = new String[noDups.Count];
    noDups.CopyTo(uniqueItems);
    return uniqueItems;
  }

shenmue024

string str = "aa,bb,cc,dd,aa,bb,cc,dd";
The
ArrayList al = new ArrayList(str.Split(','));
al.Sort();
The
for(int i=1;i<al.Count;i++)
{
if(al[i].ToString() == al[i-1].ToString())
{
al.RemoveAt(i);
i--;
}
}


str = "";

for(int i=0;i<al.Count;i++)
{
str += al[i].ToString()+",";
}
The

str =str.Substring(0,str.Length-1);
Response.Write(str);

sulfuresser

Try:

using System.Text;
StringBuilder sb=new StringBuilder();
string str="aa,bb,cc,dd,aa,bb,cc,dd";
string[] tempstr=str.Split(',');
for(int i=0;i<tempstr.Length;i++)
{
  string tmp=tempstr[i];
  int flag=0;
  for(int j=0;j<tempstr.Length;j++)
  {
     if(tmp==tempstr[j])
     {
        flag=1;
        break;
     }
  }
  if(flag==0)
  {
     sb.Append(tmp);
     sb.Append(",");
   }
}
return sb.ToString();

linhanerror

string a="aa,bb,cc,dd,aa,bb,cc,dd";
string[] strs=a.Split(',');
Hashtable ht=new Hashtable();
foreach(string str in strs)
if(!ht.Contains(str))
ht.Add(str,"");
string strRen="";
IDictionaryEnumerator ide=ht.GetEnumerator();
ide.Reset();
while(ide.MoveNext())
{
strRen+=(string)ide.Key+",";
}//Give you a fun way to write

linhanerror

string a="aa,bb,cc,dd,aa,bb,cc,dd";
string[] strs=a.Split(',');
Hashtable ht=new Hashtable();
string strRen="";
foreach(string str in strs)
if(!ht.Contains(str))
{
ht.Add(str,"");
strRen+=str+",";
}
//It turns out that

honghuwang

Use the split function to generate an array... Greatly written in detail..

It doesn't have to be compared one by one.. In the collection framework. Some do not allow duplicate values. Hashtable is a good example.

I don’t remember which of the HashMap HashSet does not allow duplicates...