var MyCircularQueue = function (k) {
    this.arr = new Array(k);
    this.head = 0;
    this.tail = -1;
    this.cnt = 0;
};

/** 
 * @param {number} value
 * @return {boolean}
 */
MyCircularQueue.prototype.enQueue = function (value) {
    if (this.isFull()) return false;
    this.tail += 1;
    this.tail %= this.arr.length;
    this.arr[this.tail] = value;
    this.cnt++;
    return true;
};

/**
 * @return {boolean}
 */
MyCircularQueue.prototype.deQueue = function () {
    if (this.isEmpty()) return false;
    this.head += 1;
    this.head %= this.arr.length;
    this.cnt--;
    return true;
};

/**
 * @return {number}
 */
MyCircularQueue.prototype.Front = function () {
    if (this.isEmpty()) return -1;
    return this.arr[this.head];
};

/**
 * @return {number}
 */
MyCircularQueue.prototype.Rear = function () {
    if (this.isEmpty()) return -1;
    return this.arr[this.tail];
};

/**
 * @return {boolean}
 */
MyCircularQueue.prototype.isEmpty = function () {
    return this.cnt === 0
};

/**
 * @return {boolean}
 */
MyCircularQueue.prototype.isFull = function () {
    return this.cnt === this.arr.length;
};