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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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