2024年【LeetCode刷题日记】[641，面试建议

网上学习资料一大堆，但如果学到的知识不成体系，遇到问题时只是浅尝辄止，不再深入研究，那么很难做到真正的技术提升。

需要这份系统化的资料的朋友，可以添加戳这里获取

一个人可以走的很快，但一群人才能走的更远！不论你是正从事IT行业的老鸟或是对IT行业感兴趣的新人，都欢迎加入我们的的圈子（技术交流、学习资源、职场吐槽、大厂内推、面试辅导），让我们一起学习成长！

#include <iostream>
#include <vector>

using namespace std;

class MyCircularDeque {

private:
    vector<int> arr;
    int front;
    int rear;
    int capacity;

public:
    /** Initialize your data structure here. Set the size of the deque to be k. */
    MyCircularDeque(int k) {
        capacity = k + 1;
        arr.assign(capacity, 0);

        front = 0;
        rear = 0;
    }

    /** Adds an item at the front of Deque. Return true if the operation is successful. */
    bool insertFront(int value) {
        if (isFull()) {
            return false;
        }
        front = (front - 1 + capacity) % capacity;
        arr[front] = value;
        return true;
    }

    /** Adds an item at the rear of Deque. Return true if the operation is successful. */
    bool insertLast(int value) {
        if (isFull()) {
            return false;
        }
        arr[rear] = value;
        rear = (rear + 1) % capacity;
        return true;
    }

    /** Deletes an item from the front of Deque. Return true if the operation is successful. */
    bool deleteFront() {
        if (isEmpty()) {
            return false;
        }
        // front 被设计在数组的开头，所以是 +1
        front = (front + 1) % capacity;
        return true;
    }

    /** Deletes an item from the rear of Deque. Return true if the operation is successful. */
    bool deleteLast() {
        if (isEmpty()) {
            return false;
        }
        // rear 被设计在数组的末尾，所以是 -1
        rear = (rear - 1 + capacity) % capacity;
        return true;
    }

    /** Get the front item from the deque. */
    int getFront() {
        if (isEmpty()) {
            return -1;
        }
        return arr[front];
    }

    /** Get the last item from the deque. */
    int getRear() {
        if (isEmpty()) {
            return -1;
        }
        // 当 rear 为 0 时防止数组越界
        return arr[(rear - 1 + capacity) % capacity];
    }

    /** Checks whether the circular deque is empty or not. */
    bool isEmpty() {
        return front == rear;
    }

    /** Checks whether the circular deque is full or not. */
    bool isFull() {
        // 注意：这个设计是非常经典的做法
        return (rear + 1) % capacity == front;
    }
};

/**
 * Your MyCircularDeque object will be instantiated and called as such:
 * MyCircularDeque* obj = new MyCircularDeque(k);
 * bool param_1 = obj->insertFront(value);
 * bool param_2 = obj->insertLast(value);
 * bool param_3 = obj->deleteFront();
 * bool param_4 = obj->deleteLast();
 * int param_5 = obj->getFront();
 * int param_6 = obj->getRear();
 * bool param_7 = obj->isEmpty();
 * bool param_8 = obj->isFull();
 */

C

typedef struct NODE{
    int val;
    struct NODE* pre;
    struct NODE* next;
} MyNode;

typedef struct {
    int size;
    int cursize;
    MyNode* head;
    MyNode* tail;
} MyCircularDeque;


/** Initialize your data structure here. Set the size of the deque to be k. */

MyCircularDeque* myCircularDequeCreate(int k) {
    MyCircularDeque* MyDeque = calloc(k, sizeof(MyCircularDeque));
    MyDeque->head = NULL;
    MyDeque->tail = NULL;
    MyDeque->size = k;
    MyDeque->cursize = 0;
    return MyDeque;
}

/** Adds an item at the front of Deque. Return true if the operation is successful. */
bool myCircularDequeInsertFront(MyCircularDeque* obj, int value) {
    if (obj->size == obj->cursize) {
        return false;
    }
    MyNode* node = calloc(1,sizeof(MyNode));
    node->val = value;
    if (obj->head == NULL) {
        obj->head = node;
        obj->tail = node;
    } else {
        obj->head->pre = node;
        node->next = obj->head;
        node->pre = NULL;
        obj->head = node;
    }
    obj->cursize++;
    return true;
}

/** Adds an item at the rear of Deque. Return true if the operation is successful. */
bool myCircularDequeInsertLast(MyCircularDeque* obj, int value) {
    if (obj->size == obj->cursize) {
        return false;
    }
    MyNode* node = calloc(1,sizeof(MyNode));
    node->val = value;
    if (obj->head == NULL) {
        obj->head = node;
        obj->tail = node;
    } else {
        node->next = NULL;
        obj->tail->next = node;
        node->pre = obj->tail;
        node->next = NULL;
        obj->tail = node;
    }
    obj->cursize++;
    return true;
}

/** Deletes an item from the front of Deque. Return true if the operation is successful. */
bool myCircularDequeDeleteFront(MyCircularDeque* obj) {
    if (obj->cursize == 0) {
        return false;
    }
    if (obj->cursize == 1) {
        free(obj->head);
        obj->head = NULL;
        obj->tail = NULL;
    } else {
        MyNode* temp = obj->head;
        obj->head = temp->next;
        obj->head->pre = NULL;
        free(temp);
    }
    obj->cursize--;
    return true;
}

/** Deletes an item from the rear of Deque. Return true if the operation is successful. */
bool myCircularDequeDeleteLast(MyCircularDeque* obj) {
    if (obj->cursize == 0) {
        return false;
    }
    if (obj->cursize == 1) {
        free(obj->head);
        obj->head = NULL;
        obj->tail = NULL;
    } else {
        MyNode* temp = obj->tail;


![img](https://img-blog.csdnimg.cn/img_convert/01fe3c649d61aeadafbe604d5949d0ac.png)
![img](https://img-blog.csdnimg.cn/img_convert/4463e6211c03cf2c51a274fd32bb55ab.png)
![img](https://img-blog.csdnimg.cn/img_convert/a856a6f8528f8bcb0e56201b83d7f12d.png)

**既有适合小白学习的零基础资料，也有适合3年以上经验的小伙伴深入学习提升的进阶课程，涵盖了95%以上Go语言开发知识点，真正体系化！**

**由于文件比较多，这里只是将部分目录截图出来，全套包含大厂面经、学习笔记、源码讲义、实战项目、大纲路线、讲解视频，并且后续会持续更新**

**[如果你需要这些资料，可以戳这里获取](https://bbs.youkuaiyun.com/topics/618658159)**

tdCMZ-1715660972984)]

**既有适合小白学习的零基础资料，也有适合3年以上经验的小伙伴深入学习提升的进阶课程，涵盖了95%以上Go语言开发知识点，真正体系化！**

**由于文件比较多，这里只是将部分目录截图出来，全套包含大厂面经、学习笔记、源码讲义、实战项目、大纲路线、讲解视频，并且后续会持续更新**

**[如果你需要这些资料，可以戳这里获取](https://bbs.youkuaiyun.com/topics/618658159)**