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原创岛屿建桥问题

舟山岛屿众多，现要在 n 个岛屿之间修建桥梁，使得这 n 个岛屿之间任何两个岛屿都能够互相来往（但不一定是直接建桥，可以是 A->B->C，即为 A 能够到 C）。现已知如下信息：a. 岛屿个数；（这部分数据可以自己构造）b. 岛屿之间已有的桥梁；（这部分数据可以自己构造）问最少还需要修建多少条桥梁？比如：有 5 个岛屿 2 座桥，桥为：1->2; 3->5; 则至少建 2 座桥能使这 5 个岛屿互通。请设计合理的逻辑结构和存储结构，以及操作算法完成上述工作。...

2022-06-18 23:25:56 923

原创 open()的O_APPEND flag和用open()和lseek()将一个文件追加到另一个文件

目录 open() 所需头文件原型描述 O_APPEND 用途 Macro Expansion 用法 lseek() 所需头文件原型描述实现代码 open() 所需头文件 #include <fcntl.h> 原型 int open (const char *filename, int flags[, mode_t mode]) 描述 The open function creates and returns a new file ..

2022-03-26 15:24:28 1965 1

Keil.MDK-Middleware.7.13.0.pack

Required packs: ARM.CMSIS.[5.6.0-0] Keil.ARM Compiler.[1.6.0-0] Version: 7.13.0(2021-05-25) Release Notes: Network Component Version 7.15.0(see revision history for detalls) -added functions netARp ClearCache and netDp ClearCache to clear the ARP or NDP cache at runtime -improved dynamic memory debuaging.added more memory allocation and memory free debug events -improved DNS response validation to improve robustness and resilience against DNS cyber attacks updated for use with the FuSa C Library

2022-01-27

Keil.ARM_Compiler.1.6.0.pack

Version:1.6.0(2018-09-06) Release Notes: Added Cortex-M35P device support Event Recorder -extended SCVD file format with state information changed protocol version to 1.1 -added example projects for Cortex-MO and state information

2022-01-27

Keil.STM32NUCLEO_BSP.1.8.0.pack

Version: 1.80(2021-07-13) Release Notes: Board Examples: -Changed Assembler option to armclang(Auto Select) Updated RTX5 config files to CMSIS 5.8.0. -Terminating app main thread with osThreadExito to avoid endless loop Added board support: -NUCLEO-F429ZI board -NUCLEO-F746ZG board Added debugProbe attribute to board description.

2022-01-23

Keil.STM32F4xx_DFP.2.16.0.pack

Required packs: ARM.CMSIS.[5.6.0] Version:2.160(2022-01-19) Release Notes: UpdatedPack to STM32CubeFW F4 Firmware Package version V1.7.13. STM32CubeMX integration: -Synchronized versions of generated component::Device:STM32Cube FrameworicSTM32CubeMX (in gpdsc) and its bootstrap (in pdsc) Package Description (pdsc: -Added global define USE HAL DRIVER to thecomponent:Device:STM32Cube HAL:Common. -Added global define USE FULL LL DRIVER to the component::Device:STM32Cube LL:Common. Restructured boar

2022-01-23

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原创 岛屿建桥问题