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  1. import java.util.*;
  2.  
  3. public class Main {
  4.  
  5. 	public static void main(String[] args) {
  6.  
  7. 		Scanner sc = new Scanner(System.in);
  8. 		String st = sc.nextLine();
  9. 		String t = st;
  10.  
  11. 		HashMap<String, Integer> map = new HashMap<>();
  12. 		StringBuilder sb = new StringBuilder();
  13. 		for(int i=0;i<st.length();i++) {
  14. 			String s = String.valueOf(st.charAt(i));
  15. 			if ( map.containsKey(s)) {
  16. 				map.put(s,map.get(s)+1);
  17. 			} else
  18. 			{
  19. 				map.put(s, 1);
  20. 			}
  21. 		}
  22. 		st = "";
  23. 		int cnt = 0;
  24. 		 for (Map.Entry<String, Integer> entry : map.entrySet()) {	// HashMap Values와 Key를 순차적으로 참조 entrySet()
  25. 			String Key = entry.getKey();
  26. 		 	int Value = entry.getValue();
  27.  
  28. 		 	if(Value % 2 ==1) {
  29. 		 		st = st.concat(Key);
  30. 		 		for(int i=0;i< Value/2;i++) {
  31. 			 		sb.append(Key);}
  32. 		 			cnt +=1 ;
  33. 		 			}
  34. 		 	else {
  35. 			 	for(int i=0;i< Value/2;i++) {  
  36. 			 		sb.append(Key);}}
  37. 		}
  38.  
  39.  
  40. 		 String st2 = sb.toString();
  41.  
  42. 		 char[] ca = st2.toCharArray();
  43. 		 Arrays.sort(ca);
  44.  
  45. 		 StringBuilder sb2 = new StringBuilder();
  46. 		 sb2.append(ca);
  47.  
  48. 		//sb_Right = sb.reverse();  이렇게 쓰면 sb도 뒤집어져버림
  49. 		 if( map.size() == 1) {
  50. 			 System.out.println(t);
  51. 		 }
  52. 		 else {
  53. 			 if (cnt > 1) {
  54. 				 System.out.println("I'm Sorry Hansoo");
  55. 			 }else {
  56. 				if(cnt == 1) 
  57. 					System.out.println(sb2 + st +sb2.reverse());						
  58. 				else 
  59. 					System.out.println(sb2.toString() +sb2.reverse().toString());
  60. 				}
  61. 		 }
  62.  
  63. 	}
  64. }
  65.  
Success #stdin #stdout 0.14s 61088KB
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https://ideone.com/IXsUeR
language:
Java (HotSpot 12)
created:
3 days ago
visibility:
public

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