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#include <bits/stdc++.h> //万能头文件#include <cstdio>#include <iostream>#include <algorithm>#include <cmath>#include <cstring>#include <float.h>#include <ctype.h>#include <map>#include <stdbool

#include <cstdio>#include <iostream>#include <algorithm>#include <cmath>#include <cstring>#include <float.h>#include <ctype.h>#include <map>#include <stdbool.h>using namespace std;

#ifndef MUSIC_H#define MUSIC_H#include<bits/stdc++.h>#include<windows.h>#define qdo 262 #define qre 294#define qmi 330#define qfa 349#define qso 392#define qla 440#define qsi 494#define do 523#define re 578#define mi 659#define fa

#ifndef EQUATION_H#define EQUATION_H#include<bits/stdc++.h>using namespace std;double one_equa(double x,double y){ return -y/x;}double two_equax(double a,double b,double c,double d,double e,double f){ double m=-d/a; double y=(f+m*c)/(e+m*b);

步骤1.新建一个 .cpp 文件2.基本结构3.注意事项（1）编译时保存成 .h 文件（2）如果内容正确的话会提示：（3）会生成.h.gch文件，莫删除4.例子：[高精度头文件](https://blog.youkuaiyun.com/qi_programmer/article/details/121853809)1.新建一个 .cpp 文件2.基本结构#ifndef CLEAR_H //clear.h大写。一般都要大写。#define CLEAR_H#include<bits/stdc++.h>

最近写高精度写得有些烦，于是直接整了个高精度头文件。头文件名字： clear.hclear.hclear.h包含函数：clearplus(a,b);//高精加clearmulti(a,b);//高精乘cleardiv(a,b);//高精除clearmod(a,b);//高精模clearsqrt(a,b);//高精开根//转载请注明出处。#ifndef CLEAR_H#define CLEAR_H#include<bits/stdc++.h>#define ll long