Time: 33 ms, Memory: 16.9 MB -LeetHub

Author: sachin10101998

design-circular-queue/design-circular-queue.cpp

@@ -0,0 +1,79 @@
+class MyCircularQueue {
+private:
+    vector<int> data;
+    int head;
+    int tail;
+    int size;
+public:
+    /** Initialize your data structure here. Set the size of the queue to be k. */
+    MyCircularQueue(int k) {
+        data.resize(k);
+        head = -1;
+        tail = -1;
+        size = k;
+    }
+    
+    /** Insert an element into the circular queue. Return true if the operation is successful. */
+    bool enQueue(int value) {
+        if (isFull()) {
+            return false;
+        }
+        if (isEmpty()) {
+            head = 0;
+        }
+        tail = (tail + 1) % size;
+        data[tail] = value;
+        return true;
+    }
+    
+    /** Delete an element from the circular queue. Return true if the operation is successful. */
+    bool deQueue() {
+        if (isEmpty()) {
+            return false;
+        }
+        if (head == tail) {
+            head = -1;
+            tail = -1;
+            return true;
+        }
+        head = (head + 1) % size;
+        return true;
+    }
+    
+    /** Get the front item from the queue. */
+    int Front() {
+        if (isEmpty()) {
+            return -1;
+        }
+        return data[head];
+    }
+    
+    /** Get the last item from the queue. */
+    int Rear() {
+        if (isEmpty()) {
+            return -1;
+        }
+        return data[tail];
+    }
+    
+    /** Checks whether the circular queue is empty or not. */
+    bool isEmpty() {
+        return head == -1;
+    }
+    
+    /** Checks whether the circular queue is full or not. */
+    bool isFull() {
+        return ((tail + 1) % size) == head;
+    }
+};
+
+/**
+ * Your MyCircularQueue object will be instantiated and called as such:
+ * MyCircularQueue obj = new MyCircularQueue(k);
+ * bool param_1 = obj.enQueue(value);
+ * bool param_2 = obj.deQueue();
+ * int param_3 = obj.Front();
+ * int param_4 = obj.Rear();
+ * bool param_5 = obj.isEmpty();
+ * bool param_6 = obj.isFull();
+ */