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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class MyQueue {
  6.     int[] storage = new int[100000];
  7.     int start;
  8.     int finish;
  9.     MyQueue() {
  10.         start = 0;
  11.         finish = 0;
  12.     }
  13.     void push(int n) {
  14.         storage[finish] = n;
  15.         finish++;
  16.     }
  17.     int pop() {
  18.         int a = storage[start];
  19.         start++;
  20.         return a;
  21.     }
  22.     int front() {
  23.         return storage[start];
  24.     }
  25.     int size() {
  26.         return finish - start;
  27.     }
  28.  
  29.     String clear() {
  30.         finish = 0;
  31.         start = 0;
  32.         return "ok";
  33.     }
  34.  
  35.     String exit() {
  36.         return "bye";
  37.     }
  38. }
  39.  
  40. public class Main {
  41. 	public static void main(String[] args) throws java.lang.Exception {
  42. 		String a;
  43. 		MyQueue x = new MyQueue();
  44. 		try (Scanner sc = new Scanner(System.in)) {
  45. 			while (sc.hasNextLine()){
  46. 				a = sc.next();
  47. 				if (a.equals("push")) {
  48. 					int n;
  49. 					n = sc.nextInt();
  50. 					x.push(n);
  51. 					System.out.println("ok");
  52. 				}
  53. 				if (a.equals("pop")) {
  54. 					System.out.println(x.pop());
  55. 				}
  56. 				if (a.equals("front")) {
  57. 					System.out.println(x.front());
  58. 				}
  59. 				if (a.equals("size")) {
  60. 					System.out.println(x.size());
  61. 				}
  62. 				if (a.equals("clear")) {
  63. 					System.out.println(x.clear());
  64. 				}
  65. 				if (a.equals("exit")) {
  66. 					System.out.println(x.exit());
  67. 					break;
  68. 				}
  69. 			}
  70. 		}
  71. 	}
  72. }
Success #stdin #stdout 0.16s 321344KB
comments (?)
stdin
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push 123
size
push -5
pop
exit
stdout
copy 
ok
1
ok
123
bye
https://ideone.com/xUhCGu
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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