每天一道LeetCode——设计循环队列

typedef struct {
    int front;
    int rear;
    int k;
    int* a;
} MyCircularQueue;


MyCircularQueue* myCircularQueueCreate(int k) {
    MyCircularQueue* obj = (MyCircularQueue*)malloc(sizeof(MyCircularQueue));
    if(obj == NULL)
    {
        perror("malloc fail:");
        return;
    }
    obj->a = (int*)malloc(sizeof(int)*(k+1));
    obj->front = obj->rear = 0;
    obj->k = k;
    return obj;
}

bool myCircularQueueIsEmpty(MyCircularQueue* obj) {
    return obj->front == obj->rear;
}

bool myCircularQueueIsFull(MyCircularQueue* obj) {
    return (obj->rear+1)%(obj->k+1) == obj->front;
}

bool myCircularQueueEnQueue(MyCircularQueue* obj, int value) {
    //判断队列是否满
    if(myCircularQueueIsFull(obj))
    {
        return false;
    }
    obj->a[obj->rear] = value;
    obj->rear++;
    obj->rear%=(obj->k+1);
    return true;

}

bool myCircularQueueDeQueue(MyCircularQueue* obj) {
    //判断队列是否满
    if(myCircularQueueIsEmpty(obj))
    {
        return false;
    }
    obj->front++;
    obj->front%= (obj->k+1);
    return true;
}

int myCircularQueueFront(MyCircularQueue* obj) {
    if(myCircularQueueIsEmpty(obj))
        return -1;
    return obj->a[obj->front];
}

int myCircularQueueRear(MyCircularQueue* obj) {
    if(myCircularQueueIsEmpty(obj))
        return -1;
    return obj->a[(obj->rear+obj->k)%(obj->k+1)];
}

void myCircularQueueFree(MyCircularQueue* obj) {
    free(obj->a);
    free(obj);
}