CC_1.1

CC_1_1.java

/**
 * Created by bitcpf on 6/16/14.
 * Assume all character is ASCII
 * Create a boolen matrix with all False
 * Change the value if there is a character match the ASCII
 */
 
 

public class uniquestring{
	
	  public static boolean unique(String s){
	      // Default is False
	    boolean assic[] = new boolean[256];
	    // If s is empty, return Ture
	    if(s.isEmpty()==true){
	      return true;
	    }
	    for(int i=0;i<s.length();i++){
	      if(assic[s.charAt(i)])
	        return false;
	      else
	        assic[s.charAt(i)]=true;
	        
	    }
	    return true;
	    
	    
	    
	  }
  
  public static void main(String[] args){
    String my_str="aaaa";
    System.out.println(unique(my_str));
    
  }

}