private static void find(String[] s,int k){ 
        Map<String,Integer> map = new HashMap<>(); 
        for(String s1:s){ 
            if(map.containsKey(s1)){ 
                map.put(s1,map.get(s1)+1); 
            }else{ 
                map.put(s1,1); 
            } 
        } 
        PriorityQueue<String> priorityQueue = new PriorityQueue<>(new Comparator<String>() { 
            @Override public int compare(String o1, String o2) { 
                if(o1.charAt(0)!=o2.charAt(0)){ 
                    return o2.charAt(0)-o1.charAt(0); 
                }else{ 
                    return o1.substring(1).compareTo(o2.substring(1)); 
                } 
            } 
        }); 
        for(String s2:map.keySet()){ 
            String s1 = String.valueOf(map.get(s2))+s2; priorityQueue.add(s1); 
        } 
        get(k,priorityQueue); 
        PriorityQueue<String> priorityQueue1 = new PriorityQueue<>(); 
        for(String s2:map.keySet()){ 
            String s1 = String.valueOf(map.get(s2))+s2; priorityQueue1.add(s1); 
        } 
        get(k,priorityQueue1); 
    } 
    private static void get(int k,PriorityQueue<String> priorityQueue){ 
        for(int i=0;i<k;i++){ 
            String s1 = priorityQueue.poll(); 
            System.out.print(s1.substring(1,s1.length())); 
            System.out.print(" "); 
            System.out.print(s1.substring(0,1)); 
            System.out.println(" "); 
        } 
    }