Given a string, can you remove all duplicate characters in the string.

Question

Anonymous · Accepted Answer

Create result string to append characters if not already in the string.

Amol Rai:- Remove duplicate char from string · Answer

public class RemoveDuplicateString {

public static String removeDuplicateFromString(String str){
        // Convert String into Char Array
        // Create TreeSet object
        // Iterate Char Array and add into TreeSet
        if(!str.isEmpty()){
           char charString[] = str.toCharArray();
            Set st = new TreeSet();
            for(char ch:charString){
                st.add(ch);
            }
            return st.toString();
        }
        return "";
    }

public static void main(String arr[]){
        String uniqueString = RemoveDuplicateString.removeDuplicateFromString("aaaabbccd");
        System.out.println(uniqueString);
    }
}

Karthik · Answer

-------------PHP ------------

$str = "Hellooooo";
        
        $split = str_split($str);
        $char = '';
        foreach($split as $sp){
            if(strrpos($char, $sp) == 0){
                $char .= $sp;
            }
        };
        
        echo $char;

Anonymous · Answer

x='Hello, worldoo'
j=""
for i in list(x):
  if i in j:
    pass
  else: 
    j=j+i
print(j)

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