Tips:用法：$x = io.read(x)、io.write(x)$ Tips:输出换行的格式如下：io.write(x, '\n')

模板

#include <bits/stdc++.h>
using namespace std;
using lint = long long;
// #define DEBUG 1  // 调试开关
struct IO 
{
	#define MAXSIZE (1 << 20)
	#define isdigit(x) (x >= '0' && x <= '9')
		char buf[MAXSIZE], *p1, *p2;
		char pbuf[MAXSIZE], *pp;
	#if DEBUG
	#else
		IO() : p1(buf), p2(buf), pp(pbuf) {}
		~IO() { fwrite(pbuf, 1, pp - pbuf, stdout); }
	#endif
	char gc() 
	{
		#if DEBUG  // 调试，可显示字符
    		return getchar();
		#endif
    		if (p1 == p2) p2 = (p1 = buf) + fread(buf, 1, MAXSIZE, stdin);
    	return p1 == p2 ? ' ' : *p1++;
	}
	bool blank(char ch) 
	{
		return ch == ' ' || ch == '\n' || ch == '\r' || ch == '\t';
	}
	template <class T>
	T read(T &x) 
	{
    	double tmp = 1;
    	bool sign = 0;
    	x = 0;
    	char ch = gc();
    	for (; !isdigit(ch); ch = gc())
    		if (ch == '-') sign = 1;
    	for (; isdigit(ch); ch = gc()) x = x * 10 + (ch - '0');
    	if (ch == '.')
    	for (ch = gc(); isdigit(ch); ch = gc())
        	tmp /= 10.0, x += tmp * (ch - '0');
    	if (sign) x = -x;
		return x;
	}
	void read(char *s) 
	{
    	char ch = gc();
    	for (; blank(ch); ch = gc());
    	for (; !blank(ch); ch = gc()) *s++ = ch;
    	*s = 0;
	}
	void read(char &c) { for (c = gc(); blank(c); c = gc()); }
	void push(const char &c) 
	{
		#if DEBUG  // 调试，可显示字符
    		putchar(c);
		#else
    		if (pp - pbuf == MAXSIZE) fwrite(pbuf, 1, MAXSIZE, stdout), pp = pbuf;
    		*pp++ = c;
		#endif
	}
	template <class T>
	void write(T x) 
	{
		if (x < 0) x = -x, push('-');  // 负数输出
		static T sta[35];
    	T top = 0;
    	do 
		{
    	  sta[top++] = x % 10;
		  x /= 10;
    	} while (x);
    	while (top) push(sta[--top] + '0');
  	}
	template <class T>
	void write(T x, char lastChar) 
	{
		write(x);
		push(lastChar);
	}
} io;
// 输入：x = io.read(x)
// 输出：io.write(x, '\n'); 
int main() 
{
	
	return 0;
}

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