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  | include <algorithm>  //STL 通用算法
include <bitset>     //STL 位集容器
include <cctype>     //定义错误码
#include <cerrno>    //定义错误码
include <clocale>    //定义本地化函数
include <cmath>      //定义数学函数
include <complex>    //复数类
#include <cstdio>    /定义输入/输出函数
#include <cstdlib>   //定义杂项函数及内存分配函数
include <cstring>    //字符串处理
#include <ctime>     //定义关于时间的函数
include <deque>      //STL 双端队列容器
include <exception>  //异常处理类
include <fstream>    //文件输入/输出
include <functional> //STL 定义运算函数(代替运算符)
include <limits>     //定义各种数据类型最值常量
#include <list>      //STL 线性列表容器
#include <map>       //STL 映射容器
include <iomanip>
#include <ios>       //基本输入/输出支持
#include <iosfwd>    //输入/输出系统使用的前置声明
include <iostream>
include <istream>    //基本输入流
include <ostream>    //基本输出流
include <queue>      //STL 队列容器
include <set>        //STL 集合容器
#include <sstream>   //基于字符串的流
include <stack>      //STL 堆栈容器
include <stdexcept>  //标准异常类
include <streambuf>  //底层输入/输出支持
include <string>     //字符串类
include <utility>    //STL 通用模板类
include <vector>     //STL 动态数组容器
include <cwchar>
include <cwctype>
using namespace std;
///C99 增加
include <complex.h>  //复数处理
include <fenv.h>     //浮点环境
include <inttypes.h> //整数格式转换
include <stdbool.h>  //布尔环境
include <stdint.h>   //整型环境
include <tgmath.h>   //通用类型数学宏
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