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It is recommended to copy the code and run it again to see the idea!!! Easy to understand, please read it carefully. It is worth noting that the code I give does not add walls. If necessary, add it yourself. No difficulty design, ibid. Map size (the wall is designed here, which is not implemented in the code) Set an intege ...

Advanced use of embedded C language (the most detailed in the whole network) 1, Macro Macro, in my opinion, is a major feature of C language. On this basis, some special functions can be used. 1.1 variable type parameter macro In some application scenarios, we often need to find the maximum and minimum values similar to the two. We often ...

1. Establish the chain storage structure of binary tree (bracket representation) Algorithm idea: ① If ch = '(': it means that the node p just created has child nodes, and it needs to be stacked as the top node of the stack in order to establish the relationship between it and its child nodes (if a node has just been created, and the subsequ ...

1601. Online map Original question transmission: AcWing 1601. Online map Enter our current location and destination, and the online map can recommend some routes. Now your job is to recommend two routes to users: one is the shortest route and the other is the fastest route. Ensure that there is at least one route between the two places for ...

Architecture diagram preface Due to the regional translation relationship, some books translate macro into "macro" and some into "macro". In order to avoid confusion (myself), the English name macro will replace the Chinese name What is conditional compilation Conditional compilation is a statement that makes selective ...

1. Introduction to linked list structure We have learned the use of arrays in the previous chapters. The space of arrays is continuous and the size of arrays is constant. In many application scenarios of dynamic data storage, it is inconvenient to use; The linked list structure introduced in this article supports the dynamic addition and relea ...

Array pointer   before unveiling the magic of array pointers, let's explore whether arrays have their own specific types? 1. Array type   we know that an array is an ordered collection of variables of the same type. For example, int a[5] = {0};, The meaning is that five int variables are collected together and managed by arr ...

We have already touched the topic of pointer in the chapter of pointer at the primary stage. We know the concept of pointer: A pointer is a variable used to store an address, which uniquely identifies a piece of memory space.The size of the pointer is fixed at 4 / 8 bytes (32-bit platform / 64 bit platform).Pointers are typed. The pointer typ ...

How to use the process? What is the difference between and thread usage? When doing network IO programming, a very ideal situation is to allocate a thread to the new client every time accept returns. Such a client corresponds to a thread. There will be no multiple threads sharing a sockfd. Per request per thread, and the code logic is very rea ...

Entry parameter: struct vdIn * vd. 1. Turn on a usb camera if((vd->fd = OPEN_VIDEO(vd->videodevice, O_RDWR)) == -1) { perror("ERROR opening V4L interface"); DBG("errno: %d", errno); return -1; } #define OPEN_VIDEO(fd, flags) open(fd, flags) The main function is the open function, where VD - > videodevice ...