include<assert.h> //设定插入点、n
include <ctype.h> //字符处理
include <errno.h> //定义错误码
include <float.h> //浮点数处理
include <fstream.h> //文件输入/输出
include <iomanip.h> //参数化输入/输出
include<iostream.h> //数据流输入/输出
include<limits.h> //定义各种数据类型最值常量
include<locale.h> //定义本地化函数
include <math.h> //定义数学函数
include <stdio.h> //定义输入/输出函数
include<stdlib.h> //定义杂项函数及内存分配函数
include <string.h> //字符串处理
include<strstrea.h> //基于数组的输入/输出
include<time.h> //定义关于时间的函数
include <wchar.h> //宽字符处理及输入/输出
include <wctype.h> //宽字符分类
include <algorithm> //STL通用算法
include <bitset> //STL位集容器
include <cctype>
include <cerrno>
include <clocale>
include <cmath>
include <complex> //复数类
include <cstdio>
include <cstdlib>
include <cstring>
include <ctime>
include <deque> //STL双端队列容器
include <exception> //异常处理类
include <fstream>
include <functional> //STL定义运算函数(代替运算符)
include <limits>
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;
include <complex.h> //复数处理
include <fenv.h> //浮点环境
include <inttypes.h> //整数格式转换
include <stdint.h> //整型环境
include <tgmath.h> //通用类型数学宏