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44 lines (35 loc) · 1 KB
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package leetcode.easy;
import java.util.ArrayDeque;
import java.util.Deque;
@SuppressWarnings({ "InnerClassMayBeStatic", "PublicConstructorInNonPublicClass", "unused" })
public class P_232 {
class MyQueue {
private final Deque<Integer> dq1;
private final Deque<Integer> dq2;
private int front = -1;
public MyQueue() {
dq1 = new ArrayDeque<>();
dq2 = new ArrayDeque<>();
}
public void push(int x) {
if (dq1.isEmpty()) {
front = x;
}
dq1.addFirst(x);
}
public int pop() {
if (dq2.isEmpty()) {
while (!dq1.isEmpty()) {
dq2.addFirst(dq1.removeFirst());
}
}
return dq2.removeFirst();
}
public int peek() {
return dq2.isEmpty() ? front : dq2.getFirst();
}
public boolean empty() {
return dq1.size() + dq2.size() == 0;
}
}
}