1407231901-hd-Problem C.cpp

本文探讨了如何通过编程实现质数的识别,并利用特定公式生成连续的质数序列。

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#include<stdio.h>
#include<math.h>
int prime(int a)
{
 int i;
 if(a==0||a==1)
     return 0;
 else
 {
  for(i=2;i<=sqrt(a);i++)
      if(a%i==0)
       break;
  if(i<=sqrt(a))
      return 0;
  else
      return 1;
 }
}
int main()
{
 int x,y;
 int i,j;
 while(scanf("%d%d",&x,&y)&&(x!=0||y!=0))
 {
  j=0;
  for(i=x;i<=y;i++)
      if(prime(i*i+i+41))
       j++;
  if(j==y-x+1)
      printf("OK\n");
  else
      printf("Sorry\n");
 }
 return 0;
}
Package pcre-8.42-6.el8.x86_64 is already installed. Error: Problem 1: conflicting requests - nothing provides expat(x86-64) = 2.2.5-4.el8 needed by expat-devel-2.2.5-4.el8.x86_64 Problem 2: conflicting requests - nothing provides freetype = 2.9.1-4.el8_3.1 needed by freetype-devel-2.9.1-4.el8_3.1.x86_64 Problem 3: conflicting requests - nothing provides libffi = 3.1-22.el8 needed by libffi-devel-3.1-22.el8.x86_64 Problem 4: conflicting requests - nothing provides libselinux(x86-64) = 2.9-5.el8 needed by libselinux-devel-2.9-5.el8.x86_64 Problem 5: conflicting requests - nothing provides libverto(x86-64) = 0.3.0-5.el8 needed by libverto-devel-0.3.0-5.el8.x86_64 Problem 6: conflicting requests - nothing provides pcre2(x86-64) = 10.32-2.el8 needed by pcre2-devel-10.32-2.el8.x86_64 Problem 7: conflicting requests - nothing provides xz-libs(x86-64) = 5.2.4-3.el8 needed by xz-devel-5.2.4-3.el8.x86_64 Problem 8: conflicting requests - nothing provides zlib(x86-64) = 1.2.11-17.el8 needed by zlib-devel-1.2.11-17.el8.x86_64 Problem 9: problem with installed package glibc-gconv-extra-2.28-251.el8_10.2.x86_64 - package glibc-gconv-extra-2.28-251.el8_10.2.x86_64 requires glibc(x86-64) = 2.28-251.el8_10.2, but none of the providers can be installed - package glibc-gconv-extra-2.28-251.el8_10.16.x86_64 requires glibc(x86-64) = 2.28-251.el8_10.16, but none of the providers can be installed - cannot install both glibc-2.28-164.el8.x86_64 and glibc-2.28-251.el8_10.2.x86_64 - cannot install both glibc-2.28-164.el8.x86_64 and glibc-2.28-251.el8_10.16.x86_64 - conflicting requests Problem 10: problem with installed package glibc-minimal-langpack-2.28-251.el8_10.2.x86_64 - package glibc-minimal-langpack-2.28-251.el8_10.2.x86_64 requires glibc-common = 2.28-251.el8_10.2, but none of the providers can be installed - package glibc-minimal-langpack-2.28-251.el8_10.16.x86_64 requires glibc-common = 2.28-251.el8_10.16, but none of the providers can be installed - cannot install both glibc-common-2.28-164.el8.x86_64 and glibc-common-2.28-251.el8_10.2.x86_64 - cannot install both glibc-common-2.28-164.el8.x86_64 and glibc-common-2.28-251.el8_10.16.x86_64 - conflicting requests Problem 11: problem with installed package glibc-all-langpacks-2.28-251.el8_10.2.x86_64 - package glibc-all-langpacks-2.28-251.el8_10.16.x86_64 requires glibc-common = 2.28-251.el8_10.16, but none of the providers can be installed - package glibc-all-langpacks-2.28-251.el8_10.2.x86_64 requires glibc = 2.28-251.el8_10.2, but none of the providers can be installed - cannot install both glibc-common-2.28-164.el8.x86_64 and glibc-common-2.28-251.el8_10.16.x86_64 - cannot install both glibc-2.28-164.el8.x86_64 and glibc-2.28-251.el8_10.2.x86_64 - package glibc-langpack-en-2.28-164.el8.x86_64 requires glibc-common = 2.28-164.el8, but none of the providers can be installed - package glibc-devel-2.28-164.el8.x86_64 requires glibc = 2.28-164.el8, but none of the providers can be installed - conflicting requests Problem 12: package krb5-devel-1.18.2-14.el8.x86_64 requires libselinux-devel, but none of the providers can be installed - package libselinux-devel-2.9-10.el8_10.x86_64 requires pkgconfig(libpcre2-8), but none of the providers can be installed - package libselinux-devel-2.9-10.el8_10.i686 requires pkgconfig(libpcre2-8), but none of the providers can be installed - package libselinux-devel-2.9-8.el8.x86_64 requires pkgconfig(libpcre2-8), but none of the providers can be installed - pcre2-devel-10.32-3.el8_6.i686 has inferior architecture - package pcre2-devel-10.32-3.el8_6.x86_64 requires pcre2-utf16(x86-64) = 10.32-3.el8_6, but none of the providers can be installed - cannot install both pcre2-utf16-10.32-2.el8.x86_64 and pcre2-utf16-10.32-3.el8_6.x86_64 - conflicting requests - nothing provides libselinux(x86-64) = 2.9-5.el8 needed by libselinux-devel-2.9-5.el8.x86_64 - nothing provides pcre2(x86-64) = 10.32-2.el8 needed by pcre2-devel-10.32-2.el8.x86_64 Problem 13: package krb5-devel-1.18.2-14.el8.x86_64 requires libselinux-devel, but none of the providers can be installed - package libselinux-devel-2.9-10.el8_10.x86_64 requires pkgconfig(libpcre2-8), but none of the providers can be installed - package libselinux-devel-2.9-10.el8_10.i686 requires pkgconfig(libpcre2-8), but none of the providers can be installed - package libselinux-devel-2.9-8.el8.x86_64 requires pkgconfig(libpcre2-8), but none of the providers can be installed - package pcre2-devel-10.32-3.el8_6.i686 requires libpcre2-32.so.0, but none of the providers can be installed - package pcre2-devel-10.32-3.el8_6.i686 requires pcre2-utf32(x86-32) = 10.32-3.el8_6, but none of the providers can be installed - package openssl-devel-1:1.1.1k-5.el8_5.x86_64 requires krb5-devel(x86-64), but none of the providers can be installed - pcre2-utf32-10.32-3.el8_6.i686 has inferior architecture - package pcre2-devel-10.32-3.el8_6.x86_64 requires pcre2-utf32(x86-64) = 10.32-3.el8_6, but none of the providers can be installed - package krb5-devel-1.18.2-29.el8_10.x86_64 requires krb5-libs(x86-64) = 1.18.2-29.el8_10, but none of the providers can be installed - package krb5-devel-1.18.2-32.el8_10.x86_64 requires krb5-libs(x86-64) = 1.18.2-32.el8_10, but none of the providers can be installed - cannot install both pcre2-utf32-10.32-2.el8.x86_64 and pcre2-utf32-10.32-3.el8_6.x86_64 - cannot install both krb5-libs-1.18.2-14.el8.x86_64 and krb5-libs-1.18.2-29.el8_10.x86_64 - cannot install both krb5-libs-1.18.2-14.el8.x86_64 and krb5-libs-1.18.2-32.el8_10.x86_64 - conflicting requests - nothing provides libselinux(x86-64) = 2.9-5.el8 needed by libselinux-devel-2.9-5.el8.x86_64 - nothing provides pcre2(x86-64) = 10.32-2.el8 needed by pcre2-devel-10.32-2.el8.x86_64 (try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)
最新发布
06-07
<think>我们正在处理在CentOS8中安装开发库时出现的依赖冲突问题。用户提到了多个库(expat、freetype、libffi、libselinux、libverto、pcre2、xz-libszlib)的版本不匹配问题。我们需要提供解决依赖冲突的方法。根据引用[1][2],我们知道在CentOS中可以使用yum或dnf来管理包,并且引用[1]提到了使用`yumwhatprovides`来查询提供特定文件或库的包。另外,引用[2]展示了在CentOS8中仓库的列表,包括AppStreamBaseOS等。在CentOS8中,dnf是默认的包管理器。我们可以通过以下步骤来解决依赖冲突:1.**确保系统更新**:首先,确保系统是最新的,这可以解决一些已知的依赖问题。```bashsudodnfupdate```2.**使用dnf查找特定库的包**:如果知道库的名称,可以使用`dnfprovides`(相当于`yumwhatprovides`)来查找提供该库的包。例如,查找freetype:```bashdnfprovidesfreetype```3.**明确指定版本安装**:如果多个版本存在,我们可以尝试安装特定版本的库。例如,安装特定版本的zlib:```bashdnfinstallzlib-1.2.11-16.el8_2```4.**使用模块(Modules)**:CentOS8引入了模块(Modules),它允许在同一仓库中提供不同版本的软件包。我们可以查看可用的模块并启用适合的版本。-列出可用模块:```bashdnfmodulelist```-启用特定模块流(modulestream)版本。例如,对于某个库的模块,我们可以启用:```bashdnfmoduleenable<module-name>:<stream>```5.**处理依赖冲突的错误信息**:当安装失败时,dnf通常会给出冲突的详细信息,我们可以根据这些信息调整安装命令。例如,如果要求安装的包A需要库B>=2.0,但系统中只有1.8,我们可以尝试安装库B的更高版本,或者寻找与库B1.8兼容的包A的旧版本。6.**使用仓库优先级(如果添加了多个仓库)**:如果系统中有多个仓库(如EPEL、Remi等),可能会因为不同仓库提供的版本不同而导致冲突。我们可以使用`dnf-plugin-priorities`来设置仓库优先级,确保优先使用稳定仓库。7.**尝试使用DNF的`--allowerasing`选项**:这个选项允许dnf删除冲突的包。但是要小心,因为它可能会删除一些系统需要的包。```bashsudodnfinstall--allowerasing<package>```8.**清理并重建dnf缓存**:有时候,清理缓存可以解决一些奇怪的问题。```bashsudodnfcleanallsudodnfmakecache```9.**使用容器或虚拟环境**:如果依赖问题难以解决,可以考虑使用容器(如Docker)或虚拟环境(如Python的virtualenv)来隔离环境。10.**手动编译安装**:如果以上方法都不奏效,可以考虑手动下载源代码编译安装,但要注意这可能会使后续的包管理变得复杂。对于用户提到的多个库(expat,freetype,libffi,libselinux,libverto,pcre2,xz-libs,zlib),我们可以按照上述步骤尝试解决。具体步骤如下:-首先,尝试更新系统,并确保启用了正确的仓库(包括BaseOSAppStream等)。-然后,使用`dnfprovides`查找每个库对应的包,并查看可用的版本。-如果存在冲突,尝试安装与系统其他部分兼容的版本。如果必要,使用模块功能。注意:在CentOS8中,很多库属于BaseOSAppStream仓库,它们之间的版本通常是兼容的。如果遇到问题,可能由于第三方仓库导致的版本冲突。引用[1]提到了使用`yumwhatprovides`(在CentOS8中应使用`dnfprovides`)来查找包。因此,我们可以针对每个库执行:```bashdnfprovides*/libexpat.*dnfprovides*/libfreetype.*#类似地查询其他库```这将给出提供该库的包名版本。然后我们可以尝试安装这些包。最后,注意用户的问题可能是在安装某个特定的开发库(如Anaconda,如引用[3]所示)时遇到的依赖冲突。如果用户是在安装Anaconda,那么Anaconda可能会自带一套库,与系统库冲突。这时,可以考虑使用Anaconda的隔离环境,或者确保Anaconda不覆盖系统库。由于用户引用了Anaconda下载的命令(引用[3]),需要提醒用户注意Anaconda安装可能会修改环境变量,导致系统库被覆盖。因此,可能需要检查PATHLD_LIBRARY_PATH等环境变量,确保系统库路径在Anaconda之前。因此,我们的回答应围绕以上方法展开。相关问题:§§相关问题§§1.在CentOS8中,如何查看当前已安装的库的版本?2.如何配置dnf仓库优先级来解决依赖冲突?3.使用dnf模块管理不同版本库的详细步骤是什么?4.如何避免Anaconda安装与系统库的冲突?</think> ### 解决CentOS 8开发库依赖冲突的方法 在CentOS 8中处理开发库(如expat、freetype、libffi等)的依赖冲突问题,可通过以下结构化方法逐步解决: #### 1. **诊断冲突根源** ```bash sudo dnf check-update # 检查可更新包 rpm -qa | grep -E 'expat|freetype|libffi|zlib' # 查看已安装版本 ``` 重点关注输出中标记为"conflict"或"requires"的依赖项。 #### 2. **使用DNF模块管理版本** CentOS 8的模块化仓库支持多版本共存[^2]: ```bash dnf module list | grep -i '开发库名称' # 如:sudo dnf module list freetype dnf module enable <模块名>:<版本流> # 启用特定版本流 ``` #### 3. **手动解决关键依赖** 对于冲突库(如zlib): ```bash dnf provides */libz.so.* # 查找提供库的包 dnf install zlib-1.2.11-17* # 显式安装指定版本 ``` #### 4. **仓库优先级配置** 当存在多个仓库时(如EPEL[^2]): ```bash sudo dnf install dnf-plugin-priorities vi /etc/yum.repos.d/epel.repo # 添加 priority=10 确保优先使用BaseOS仓库 ``` #### 5. **高级冲突解决技巧** - **依赖隔离**:创建虚拟环境 ```bash python -m venv myenv && source myenv/bin/activate ``` - **兼容性覆盖**: ```bash dnf install --allowerasing freetype-devel-2.9.1* # 允许替换旧包 ``` - **源码编译**: ```bash wget https://download.savannah.gnu.org/releases/freetype/freetype-2.10.4.tar.gz ./configure --prefix=/usr/local/custom ``` #### 6. **系统级修复** 更新后冲突仍存在时: ```bash dnf distro-sync # 恢复发行版标准版本 dnf remove $(package-cleanup --problems) # 清理无效依赖 ``` > **注意事项**: > 1. 操作前务必备份 `/etc/yum.repos.d/` > 2. 避免混合启用`AppStream``Stream-AppStream`仓库[^2] > 3. 第三方库需通过`dnf provides`验证来源(参考引用[1]方法---
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