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Main1.java
59 lines (58 loc) · 1.88 KB
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Main1.java
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import java.util.*;
public class Main1 {
public static void main(String[] args) {
// Scanner
Scanner scan = new Scanner(System.in);
// Inisialisasi
Deque<Integer> q = new ArrayDeque<Integer>();
int Q = scan.nextInt();
boolean reversed = false;
// loop
for (int i = 0; i < Q; i++) {
String inputStr = scan.next();
int x;
switch (inputStr) {
case "addFirst":
x = scan.nextInt();
if (reversed) {
q.addLast(x);
} else {
q.addFirst(x);
}
break;
case "addLast":
x = scan.nextInt();
if (reversed) {
q.addFirst(x);
} else {
q.addLast(x);
}
break;
case "pollFirst":
if (q.size() == 0) {
System.out.println("EMPTY");
} else {
if (reversed) {
System.out.println(q.pollLast());
} else {
System.out.println(q.pollFirst());
}
}
break;
case "pollLast":
if (q.size() == 0) {
System.out.println("EMPTY");
} else {
if (reversed) {
System.out.println(q.pollFirst());
} else {
System.out.println(q.pollLast());
}
}
break;
default:
reversed = !reversed;
}
}
}
}