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  1. //e-olymp 6122. Простой стек
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. class Stack {
  8.  
  9. 	Vector<Integer> storage;
  10.  
  11. 	public Stack()
  12. 	{
  13. 		storage = new Vector<Integer>();
  14. 	}
  15.  
  16. 	void push(int number)
  17. 	{
  18. 		this.storage.add(number);
  19. 	}
  20.  
  21. 	int pop()
  22. 	{
  23. 		int lastNumber = storage.lastElement();
  24. 		storage.remove(storage.size() - 1);
  25. 		return lastNumber;
  26. 	}
  27.  
  28. 	int back()
  29. 	{
  30. 		int lastNumber = storage.lastElement();
  31. 		return lastNumber;
  32. 	}
  33.  
  34. 	int size()
  35. 	{
  36. 		return storage.size();
  37. 	}
  38.  
  39. 	void clear()
  40. 	{
  41. 		storage.clear();
  42. 	}
  43.  
  44. 	String exit()
  45. 	{
  46. 		return "bye";
  47. 	}
  48.  
  49. }
  50.  
  51.  
  52. public class Main {
  53.  
  54. 	public static void main(String[] args) {
  55. 		Stack stack = new Stack();
  56. 		Scanner input = new Scanner(System.in);
  57. 		int number;
  58. 		String request;
  59. 		while(input.hasNextLine())
  60. 		{	
  61. 			request = input.next();
  62. 			if(request.equals("push"))
  63. 			{
  64. 				number = input.nextInt();
  65. 				stack.push(number);
  66. 				System.out.println("ok");
  67. 			}
  68. 			else if(request.equals("pop")) System.out.println(stack.pop());
  69. 			else if(request.equals("back")) System.out.println(stack.back());
  70. 			else if(request.equals("size")) System.out.println(stack.size());
  71. 			else if(request.equals("clear")) 
  72. 			{
  73. 				stack.clear();
  74. 				System.out.println("ok");
  75. 			}
  76. 			else if(request.equals("exit"))
  77. 			{
  78. 				System.out.println(stack.exit());
  79. 				break;
  80. 			}
  81. 		}
  82. 	}
  83. }
  84.  
Success #stdin #stdout 0.06s 4386816KB
comments (?)
stdin
copy 
push 2
push 3
push 5
back
size
pop
size 
push 7 
pop 
clear 
size 
exit
stdout
copy 
ok
ok
ok
5
3
5
2
ok
7
ok
0
bye
https://ideone.com/o5byqF
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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