CI19.1-原地交换两个数

本文详细阐述了在不使用额外空间的情况下,如何实现两个整数的原地交换,并提供了多种解决方案,包括位运算方法和简单赋值方法。讨论了不同情况下选择合适方法的重要性,以及在特定条件下的限制。

实现一个函数原地交换两个数,且不能用辅助空间。

思路:

经典问题。

void swap(int& a, int& b)
{
	a = b - a;
	b = b - a;
	a = b + a;
}

void swap(int& a, int& b)
{
	a = a ^ b;
	b = a ^ b;
	a = a ^ b;
}


如果参数是两个相同的数,则不可以调用以上两个形式的swap函数,因为会有一个数被置0。如果程序中swap可能会作用在相同的数,则只能用一个临时变量的swap函数。

void swap(int& a, int& b)
{
	int temp = a;
	a = b;
	b = temp;
}


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最新发布
07-26
<think>嗯,用户之前问过如何将Gradle依赖转换为直接引用JAR包,现在换了之后遇到了错误,具体是读取JAR包时出错,提示“error in opening zip file”和“cannot read zip file”。我需要先分析可能的原因,然后给出解决方案。 首先,用户可能下载的JAR文件损坏了。下载过程中网络不稳定或中断会导致文件不完整。这时候需要重新下载,并建议用户验证文件的哈希值,比如SHA-1或MD5,确保文件完整。 其次,文件路径或权限问题。检查路径是否正确,是否有拼写错误,尤其是Windows的路径分隔符是否正确使用了反斜杠。另外,用户是否有权限访问该文件?可能需要检查文件权限,或者尝试将JAR文件移动到其他目录,比如项目内的libs文件夹,而不是放在系统目录或其他受限位置。 还有可能是JAR包本身的问题,比如不兼容的JDK版本。用户提到的是aspose-words-19.1-de-jdk16.jar,这个JDK16可能是指需要Java 16环境?如果用户的项目使用的是较低的JDK版本,比如8或11,可能会导致兼容性问题。需要建议用户检查JDK版本是否匹配,并确认JAR包是否适用于当前项目环境。 另外,用户是否在Gradle配置中正确引用了该JAR?比如路径是否正确,是否使用了正确的语法。比如在build.gradle中使用的是绝对路径还是相对路径?如果路径中有空格或特殊字符,可能需要用引号包裹路径。 还有可能是IDE缓存的问题,有时候Gradle或IDE的缓存可能导致文件读取错误,可以尝试清理缓存并重新同步项目。 另外,用户是否在尝试解压该JAR文件?如果JAR文件本身损坏,解压工具可能会报错,可以建议用户用解压软件测试是否能正常解压,从而确认文件是否完好。 总结下来,可能的解决步骤应该是: 1. 重新下载JAR文件,验证完整性。 2. 检查文件路径是否正确,权限是否足够。 3. 确认JDK版本兼容性。 4. 检查Gradle配置中的文件引用是否正确。 5. 清理IDE和Gradle缓存,重新构建项目。 此外,用户提到的是aspose-words的JAR包,可能这个库有特定的依赖或许可证要求,是否需要考虑这些因素?比如是否需要额外的依赖或者许可证文件,但根据错误信息来看,主要问题还是文件读取失败,可能暂时不需要考虑这些。 需要确保用户按照之前的步骤正确地将JAR文件放入项目目录,并且在build.gradle中使用正确的fileTree或files引用。如果用户使用的是绝对路径,可能需要更改为相对路径,或者检查路径中的转义字符是否正确。 最后,如果所有步骤都正确,但问题依旧存在,可能需要进一步的技术支持,比如联系库的提供商或查阅相关文档,确认该JAR包是否适用于当前环境。</think>--- ### **问题分析** 出现 `读取JAR时出错; error in opening zip file` 或 `cannot read zip file` 错误,通常与以下原因相关: 1. **JAR文件损坏**(下载不完整或存储错误) 2. **文件路径错误**(路径拼写错误或权限问题) 3. **JDK版本不兼容**(JAR编译版本与当前JDK不匹配) 4. **IDE/Gradle缓存问题** --- ### **逐步解决方案** #### **1. 检查JAR文件完整性** - **重新下载JAR文件** 从官方来源(如 [Aspose Maven仓库](https://repository.aspose.com/))重新下载 `aspose-words-19.1-de-jdk16.jar`。 - **验证文件哈希值** 使用工具(如 `CertUtil`)检查文件的SHA-1/MD5是否与官方提供的一致: ```bash certutil -hashfile aspose-words-19.1-de-jdk16.jar SHA1 ``` #### **2. 检查文件路径和权限** - **确认路径正确性** 确保 `build.gradle` 中引用的路径与文件实际位置完全匹配: ```groovy dependencies { implementation files('lib/aspose-words-19.1-de-jdk16.jar') // 注意路径分隔符和大小写 } ``` - **检查文件权限** 右键点击JAR文件 → 属性 → 安全 → 确认当前用户有**读取权限**。 #### **3. 确认JDK版本兼容性** - **检查JDK版本** `aspose-words-19.1-de-jdk16.jar` 是为JDK 16编译的。运行以下命令确认项目JDK版本: ```bash java -version ``` 如果项目使用JDK 8或11,需切换至JDK 16,或下载对应低版本JAR(如 `aspose-words-19.1` 的JDK 8版本)。 #### **4. 清理Gradle/IDE缓存** - **清理Gradle缓存** 删除项目中的缓存目录: ```bash rm -rf ~/.gradle/caches/ ./gradlew cleanBuildCache ``` - **刷新IDE缓存** 在Android Studio/IntelliJ中: **File → Invalidate Caches / Restart → Invalidate and Restart** #### **5. 尝试手动解压JAR(验证损坏)** - 使用解压工具(如7-Zip)尝试解压JAR文件: ```bash # 示例命令(需安装7-Zip) 7z x aspose-words-19.1-de-jdk16.jar -oextracted ``` 如果解压失败,说明文件已损坏,需重新下载。 --- ### **附加排查建议** 1. **检查文件编码** 避免路径中包含中文或特殊字符(如空格),建议路径纯英文。 2. **尝试其他依赖方式** 如果直接引用JAR不稳定,改用Maven/Gradle依赖(需确认仓库支持): ```groovy repositories { maven { url "https://repository.aspose.com/repo/" } } dependencies { implementation 'com.aspose:aspose-words:19.1' } ``` 3. **检查磁盘错误** 运行磁盘检查工具(如Windows的 `chkdsk`),排除存储介质问题。 --- ### **总结** - **优先级排查**:文件损坏 → 路径权限 → JDK版本 → 缓存问题 - **临时替代方案**:改用Maven/Gradle依赖(避免手动管理JAR)。 如果问题仍未解决,建议提供以下信息进一步诊断: 1. 完整的Gradle报错日志 2. JDK版本和操作系统类型 3. JAR文件的下载来源和哈希值
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