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  1. import java.io.BufferedReader;
  2. import java.io.IOException;
  3. import java.io.InputStreamReader;
  4. import java.util.Stack;
  5. import java.util.StringTokenizer;
  6.  
  7. 	public class Main{
  8.  
  9. 		public static void main(String argv[]) throws IOException
  10. 		{
  11.  
  12. 			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  13.  
  14. 			Stack<String> stack1 = new Stack<String>();
  15. 			Stack<String> stack2 = new Stack<String>();
  16. 			int num;
  17. 			String str = br.readLine();
  18.  
  19. 			StringTokenizer c = new StringTokenizer(str);
  20.  
  21. 			while(c.hasMoreTokens())	
  22. 				stack1.push(c.nextToken());
  23.  
  24. 			num = Integer.parseInt(br.readLine());
  25.  
  26. 			for(int i=0; i<num; i++)
  27. 			{
  28. 				String res = br.readLine();
  29. 				StringTokenizer ne = new StringTokenizer(res, " ");
  30.  
  31. 				String cmd = ne.nextToken();
  32.  
  33. 				if(cmd.equals("P"))
  34. 				{
  35. 					stack1.push(ne.nextToken());					
  36. 				}
  37. 				else if(cmd.equals("L"))
  38. 				{
  39. 						if(!stack1.empty())
  40. 							stack2.push(stack1.pop());
  41. 				}
  42. 				else if(cmd.equals("D"))
  43. 				{
  44. 					if(!stack2.empty())
  45. 					{
  46. 						stack1.push(stack2.pop());
  47. 					}
  48. 				}
  49. 				else if(cmd.equals("B"))
  50. 				{
  51.  
  52. 					if(!stack1.empty())
  53. 					{	
  54. 						stack1.pop();
  55. 					}
  56. 				}
  57.  
  58. 			}
  59. 			while(!stack1.empty()) {//stack1이 비어있지 않을 때 까지 반복
  60. 				stack2.push(stack1.pop());
  61. 			}
  62. 			StringBuilder sb = new StringBuilder();
  63. 			while(!stack2.empty())
  64. 			{
  65. 				sb.append(stack2.pop());
  66. 			}
  67. 			System.out.println(sb);
  68. 			stack1.clear();
  69. 			stack2.clear();
  70.  
  71. 			}
  72.  
  73. 	}
  74.  
  75.  
Success #stdin #stdout 0.09s 27496KB
comments (?)
stdin
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abc
3
L
B
B
stdout
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abc
https://ideone.com/MxaFEW
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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