/*     * 187. Repeated DNA Sequences     * 2016-6-4 by Mingyang     * 简单的hashmap，注意修改一个hashmap的方法，直接map.put(temp,false)就好了     */     public static List
     
       findRepeatedDnaSequences(String s) {            List
      
        res=new ArrayList
       
        ();            int len=s.length();            if(len<10)              return res;            HashMap
        
          map=new HashMap
         
          ();            int start=0;            for(int i=10;i<=len;i++){                String temp=s.substring(start,i);                if(map.containsKey(temp)&&(map.get(temp)==true)){                    res.add(temp);                    map.put(temp,false);                }else if(!map.containsKey(temp)){                    map.put(temp,true);                }               start++;            }            return res;        }