UVA - 699:The Falling Leaves

这是一道关于二叉树问题的编程题,要求计算当二叉树的每个节点值代表的树叶落下后,形成的不同树叶堆的数量和大小。输入给出多棵树的根节点值和子树描述,输出每棵树的树叶堆积情况。

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The Falling Leaves

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题目

Each year, fall in the North Central region is accompanied by the brilliant colors of the leaves on the trees, followed quickly by the falling leaves accumulating under the trees. If the same thing happened to binary trees, how large would the piles of leaves become?
We assume each node in a binary tree ”drops”a number of leaves equal to the integer value stored in that node. We also assume that these leaves drop vertically to the ground (thankfully, there’s no wind to blow them around). Finally, we assume that the nodes are positioned horizontally in such a manner that the left and right childr

修复操作流程1 Welcome to AidLux! Work with AidLux packages using tool ‘aid-pkg’: Update list of available packages: aid-pkg update List packages: aid-pkg list Install packages: aid-pkg install <package-name> Remove packages: aid-pkg remove <package-name> Search packages: aid-pkg search <pattern> Install AidLux Web Desktop using command: aid-pkg install aid-desktop aidlux@localhost:~$ sudo dpkg --configure -a # 强制完成未完成的安装配置 Setting up docbook-xml (4.5-9) … Setting up libfprint-2-2:arm64 (1:1.90.2+tod1-0ubuntu1~20.04.10) … Failed to scan devices: Permission denied dpkg: error processing package libfprint-2-2:arm64 (–configure): installed libfprint-2-2:arm64 package post-installation script subprocess returned error exit status 1 dpkg: dependency problems prevent configuration of fprintd: fprintd depends on libfprint-2-2 (>= 1:1.90.1); however: Package libfprint-2-2:arm64 is not configured yet. dpkg: error processing package fprintd (–configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of libpam-fprintd:arm64: libpam-fprintd:arm64 depends on fprintd (= 1.90.9-1~ubuntu20.04.1); however: Package fprintd is not configured yet. dpkg: error processing package libpam-fprintd:arm64 (–configure): dependency problems - leaving unconfigured Processing triggers for rygel (0.38.3-1ubuntu1) … Processing triggers for libgdk-pixbuf2.0-0:arm64 (2.40.0+dfsg-3ubuntu0.5) … Processing triggers for dbus (1.12.16-2ubuntu2.3) … Processing triggers for sgml-base (1.29.1) … Processing triggers for dictionaries-common (1.28.1) … debconf: unable to initialize frontend: Dialog debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.) debconf: falling back to frontend: Readline aspell-autobuildhash: processing: en [en-common]. aspell-autobuildhash: processing: en [en-variant_0]. aspell-autobuildhash: processing: en [en-variant_1]. aspell-autobuildhash: processing: en [en-variant_2]. aspell-autobuildhash: processing: en [en-w_accents-only]. aspell-autobuildhash: processing: en [en-wo_accents-only]. aspell-autobuildhash: processing: en [en_AU-variant_0]. aspell-autobuildhash: processing: en [en_AU-variant_1]. aspell-autobuildhash: processing: en [en_AU-w_accents-only]. aspell-autobuildhash: processing: en [en_AU-wo_accents-only]. aspell-autobuildhash: processing: en [en_CA-variant_0]. aspell-autobuildhash: processing: en [en_CA-variant_1]. aspell-autobuildhash: processing: en [en_CA-w_accents-only]. aspell-autobuildhash: processing: en [en_CA-wo_accents-only]. aspell-autobuildhash: processing: en [en_GB-ise-w_accents-only]. aspell-autobuildhash: processing: en [en_GB-ise-wo_accents-only]. aspell-autobuildhash: processing: en [en_GB-ize-w_accents-only]. aspell-autobuildhash: processing: en [en_GB-ize-wo_accents-only]. aspell-autobuildhash: processing: en [en_GB-variant_0]. aspell-autobuildhash: processing: en [en_GB-variant_1]. aspell-autobuildhash: processing: en [en_US-w_accents-only]. aspell-autobuildhash: processing: en [en_US-wo_accents-only]. Processing triggers for libc-bin (2.31-0ubuntu9.2) … Errors were encountered while processing: libfprint-2-2:arm64 fprintd libpam-fprintd:arm64 aidlux@localhost:~ParseError: KaTeX parse error: Expected 'EOF', got '#' at position 39: …lock-frontend #̲ 清除锁定文件 aidlux@… sudo rm /var/lib/dpkg/lock sudo rm /va
最新发布
04-01
<think>嗯,用户遇到了在安装AidLux Web Desktop时出现的依赖配置错误,特别是与libfprint-2-2:arm64相关的权限问题。首先,我需要理解错误信息。日志显示在配置libfprint-2-2时,扫描设备失败,权限被拒绝。这可能是因为某些服务需要更高的权限或某些文件被锁定。 接下来,用户尝试了强制完成安装配置的命令sudo dpkg --configure -a,但依然失败。然后用户开始手动删除锁文件,但命令被截断了。这说明用户可能没有正确清除所有的锁文件,或者还有其他依赖问题未解决。 我需要考虑可能的解决方案。首先,应该检查是否有未完成的安装进程占用了dpkg,导致锁文件存在。这时候需要确保所有包管理进程都停止,并清除锁文件。用户可能只删除了/var/lib/dpkg/lock,但可能还有/var/lib/apt/lists/lock和/var/cache/apt/archives/lock需要处理。 然后,处理依赖问题。因为错误提到libfprint-2-2配置失败,可能需要手动修复。使用sudo apt install -f来修复依赖,或者尝试重新安装有问题的包。如果这些步骤无效,可能需要完全清除并重新安装相关包,比如fprintd和libfprint。 另外,权限问题也可能导致设备扫描失败。可能需要检查相关服务(如fprintd)的权限,或者暂时禁用指纹识别功能,特别是如果用户不需要它的话。通过卸载相关的包,可以避免依赖冲突,继续安装AidLux。 最后,确保用户正确执行了安装AidLux Web Desktop的步骤,即运行aid-pkg install aid-desktop,并在必要时重启服务或系统。如果所有方法都失败,建议用户查阅AidLux的官方文档或联系支持,因为可能涉及特定于该平台的问题。 需要将这些步骤清晰地传达给用户,确保他们逐步操作,避免遗漏关键步骤,比如清除所有锁文件或正确配置依赖。同时,注意用户可能对Linux系统不太熟悉,所以解释要简明,避免技术术语过多,必要时给出具体的命令示例。</think>在安装AidLux Web Desktop时出现的依赖配置错误,可通过以下步骤排查和修复: --- ### **错误分析** 从日志看出主要问题: 1. `libfprint-2-2:arm64` 包配置失败(指纹识别库权限问题) 2. `fprintd` 和 `libpam-fprintd:arm64` 因依赖关系未配置 3. 系统存在未完成的安装进程(锁定文件残留) --- ### **修复流程** #### **步骤1:清除锁定文件** ```bash sudo rm /var/lib/dpkg/lock # 删除dpkg进程锁 sudo rm /var/lib/apt/lists/lock # 删除apt资源列表锁 sudo rm /var/cache/apt/archives/lock # 删除apt缓存锁 ``` #### **步骤2:强制修复依赖关系** ```bash sudo dpkg --configure -a # 继续未完成的配置 sudo apt install -f # 修复依赖链断裂问题 ``` #### **步骤3:手动处理问题包** - **尝试重新配置包**: ```bash sudo dpkg-reconfigure libfprint-2-2:arm64 ``` - **若仍失败,强制移除问题包**: ```bash sudo dpkg --remove --force-remove-reinstreq libfprint-2-2:arm64 sudo apt autoremove # 清理残留依赖 ``` #### **步骤4:安装必要组件** 若系统无需指纹识别功能,可跳过相关包: ```bash sudo apt-mark hold libfprint-2-2:arm64 # 禁止自动安装该包 sudo apt install aid-desktop # 重新尝试安装AidLux桌面 ``` --- ### **关键问题说明** 1. **权限问题**:`libfprint-2-2` 需要访问硬件设备,确保: ```bash sudo chmod 666 /dev/usb/hiddev* # 临时赋予设备节点读写权限 ``` 2. **依赖冲突**:若步骤3无效,尝试完全卸载指纹相关组件: ```bash sudo apt purge fprintd libpam-fprintd ``` --- ### **最终验证** ```bash sudo apt update && sudo apt upgrade # 更新系统 aid-pkg install aid-desktop # 重新安装AidLux桌面 ``` 若仍报错,建议检查AidLux官方文档或联系支持,因可能与特定硬件/内核模块兼容性相关。
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