Design your implementation of the circular double-ended queue (deque).
Your implementation should support following operations:
MyCircularDeque(k): Constructor, set the size of the deque to be k.insertFront(): Adds an item at the front of Deque. Return true if the operation is successful.insertLast(): Adds an item at the rear of Deque. Return true if the operation is successful.deleteFront(): Deletes an item from the front of Deque. Return true if the operation is successful.deleteLast(): Deletes an item from the rear of Deque. Return true if the operation is successful.getFront(): Gets the front item from the Deque. If the deque is empty, return -1.getRear(): Gets the last item from Deque. If the deque is empty, return -1.isEmpty(): Checks whether Deque is empty or not.isFull(): Checks whether Deque is full or not.
Example:
MyCircularDeque circularDeque = new MycircularDeque(3); // set the size to be 3 circularDeque.insertLast(1); // return true circularDeque.insertLast(2); // return true circularDeque.insertFront(3); // return true circularDeque.insertFront(4); // return false, the queue is full circularDeque.getRear(); // return 2 circularDeque.isFull(); // return true circularDeque.deleteLast(); // return true circularDeque.insertFront(4); // return true circularDeque.getFront(); // return 4
Note:
- All values will be in the range of [0, 1000].
- The number of operations will be in the range of [1, 1000].
- Please do not use the built-in Deque library.
class MyCircularDeque:
def __init__(self, k: int):
"""
Initialize your data structure here. Set the size of the deque to be k.
"""
self.q = [0] * k
self.front = 0
self.size = 0
self.capacity = k
def insertFront(self, value: int) -> bool:
"""
Adds an item at the front of Deque. Return true if the operation is successful.
"""
if self.isFull():
return False
if not self.isEmpty():
self.front = (self.front - 1 + self.capacity) % self.capacity
self.q[self.front] = value
self.size += 1
return True
def insertLast(self, value: int) -> bool:
"""
Adds an item at the rear of Deque. Return true if the operation is successful.
"""
if self.isFull():
return False
idx = (self.front + self.size) % self.capacity
self.q[idx] = value
self.size += 1
return True
def deleteFront(self) -> bool:
"""
Deletes an item from the front of Deque. Return true if the operation is successful.
"""
if self.isEmpty():
return False
self.front = (self.front + 1) % self.capacity
self.size -= 1
return True
def deleteLast(self) -> bool:
"""
Deletes an item from the rear of Deque. Return true if the operation is successful.
"""
if self.isEmpty():
return False
self.size -= 1
return True
def getFront(self) -> int:
"""
Get the front item from the deque.
"""
if self.isEmpty():
return -1
return self.q[self.front]
def getRear(self) -> int:
"""
Get the last item from the deque.
"""
if self.isEmpty():
return -1
idx = (self.front + self.size - 1) % self.capacity
return self.q[idx]
def isEmpty(self) -> bool:
"""
Checks whether the circular deque is empty or not.
"""
return self.size == 0
def isFull(self) -> bool:
"""
Checks whether the circular deque is full or not.
"""
return self.size == self.capacity
# Your MyCircularDeque object will be instantiated and called as such:
# obj = MyCircularDeque(k)
# param_1 = obj.insertFront(value)
# param_2 = obj.insertLast(value)
# param_3 = obj.deleteFront()
# param_4 = obj.deleteLast()
# param_5 = obj.getFront()
# param_6 = obj.getRear()
# param_7 = obj.isEmpty()
# param_8 = obj.isFull()class MyCircularDeque {
private int[] q;
private int front;
private int size;
private int capacity;
/** Initialize your data structure here. Set the size of the deque to be k. */
public MyCircularDeque(int k) {
q = new int[k];
capacity = k;
}
/** Adds an item at the front of Deque. Return true if the operation is successful. */
public boolean insertFront(int value) {
if (isFull()) {
return false;
}
if (!isEmpty()) {
front = (front - 1 + capacity) % capacity;
}
q[front] = value;
++size;
return true;
}
/** Adds an item at the rear of Deque. Return true if the operation is successful. */
public boolean insertLast(int value) {
if (isFull()) {
return false;
}
int idx = (front + size) % capacity;
q[idx] = value;
++size;
return true;
}
/** Deletes an item from the front of Deque. Return true if the operation is successful. */
public boolean deleteFront() {
if (isEmpty()) {
return false;
}
front = (front + 1) % capacity;
--size;
return true;
}
/** Deletes an item from the rear of Deque. Return true if the operation is successful. */
public boolean deleteLast() {
if (isEmpty()) {
return false;
}
--size;
return true;
}
/** Get the front item from the deque. */
public int getFront() {
if (isEmpty()) {
return -1;
}
return q[front];
}
/** Get the last item from the deque. */
public int getRear() {
if (isEmpty()) {
return -1;
}
int idx = (front + size - 1) % capacity;
return q[idx];
}
/** Checks whether the circular deque is empty or not. */
public boolean isEmpty() {
return size == 0;
}
/** Checks whether the circular deque is full or not. */
public boolean isFull() {
return size == capacity;
}
}
/**
* Your MyCircularDeque object will be instantiated and called as such:
* MyCircularDeque obj = new MyCircularDeque(k);
* boolean param_1 = obj.insertFront(value);
* boolean param_2 = obj.insertLast(value);
* boolean param_3 = obj.deleteFront();
* boolean param_4 = obj.deleteLast();
* int param_5 = obj.getFront();
* int param_6 = obj.getRear();
* boolean param_7 = obj.isEmpty();
* boolean param_8 = obj.isFull();
*/