update

src/栈相关/q232_用栈实现队列/含有最大值的队列/MaxQueue.java

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+package 栈相关.q232_用栈实现队列.含有最大值的队列;
+
+import java.util.LinkedList;
+import java.util.Queue;
+
+public class MaxQueue {
+
+    private Queue<Integer> queue;
+    private LinkedList<Integer> max;
+
+    public MaxQueue() {
+        queue = new LinkedList<>();
+        max = new LinkedList<>();
+    }
+
+    public int max_value() {
+        return max.size() == 0 ? -1 : max.getFirst();
+    }
+
+    public void push_back(int value) {
+        queue.add(value);
+        while (max.size() != 0 && max.getLast() < value) {
+            max.removeLast();
+        }
+        max.add(value);
+    }
+
+    public int pop_front() {
+        if (max.size() != 0 && queue.peek().equals(max.getFirst())) {
+            max.removeFirst();
+        }
+        return queue.size() == 0 ? -1 : queue.poll();
+    }
+}