很长的模板

#include<bits/stdc++.h>
using namespace std;
namespace my_std
{
	typedef long long ll;
	typedef double db;
	#define pf printf
	#define pc putchar
	#define fr(i,x,y) for(register int i=(x);i<=(y);i++)
	#define pfr(i,x,y) for(register int i=(x);i>=(y);i--)
	#define go(x) for(int i=head[u];i;i=e[i].nxt)
	#define enter pc('
')
	#define space pc(' ')
	#define fir first
	#define sec second
	#define MP make_pair
	const int inf=0x3f3f3f3f;
	const ll inff=1e15;
	inline int read()
	{
		int sum=0,f=1;
		char ch=0;
		while(!isdigit(ch))
		{
			if(ch=='-') f=-1;
			ch=getchar();
		}
		while(isdigit(ch))
		{
			sum=(sum<<1)+(sum<<3)+(ch^48);
			ch=getchar();
		}
		return sum*f;
	}
	inline void write(int x)
	{
		if(x<0)
		{
			x=-x;
			pc('-');
		}
		if(x>9) write(x/10);
		pc(x%10+'0');
	}
	inline void writeln(int x)
	{
		write(x);
		enter;
	}
	inline void writesp(int x)
	{
		write(x);
		space;
	}
}
using namespace my_std;
namespace ka_chang
{
	#pragma GCC optimize(2)
	#pragma GCC optimize(3)
	#pragma GCC optimize("Ofast")
	#pragma GCC optimize("inline")
	#pragma GCC optimize("-fgcse")
	#pragma GCC optimize("-fgcse-lm")
	#pragma GCC optimize("-fipa-sra")
	#pragma GCC optimize("-ftree-pre")
	#pragma GCC optimize("-ftree-vrp")
	#pragma GCC optimize("-fpeephole2")
	#pragma GCC optimize("-ffast-math")
	#pragma GCC optimize("-fsched-spec")
	#pragma GCC optimize("unroll-loops")
	#pragma GCC optimize("-falign-jumps")
	#pragma GCC optimize("-falign-loops")
	#pragma GCC optimize("-falign-labels")
	#pragma GCC optimize("-fdevirtualize")
	#pragma GCC optimize("-fcaller-saves")
	#pragma GCC optimize("-fcrossjumping")
	#pragma GCC optimize("-fthread-jumps")
	#pragma GCC optimize("-funroll-loops")
	#pragma GCC optimize("-fwhole-program")
	#pragma GCC optimize("-freorder-blocks")
	#pragma GCC optimize("-fschedule-insns")
	#pragma GCC optimize("inline-functions")
	#pragma GCC optimize("-ftree-tail-merge")
	#pragma GCC optimize("-fschedule-insns2")
	#pragma GCC optimize("-fstrict-aliasing")
	#pragma GCC optimize("-fstrict-overflow")
	#pragma GCC optimize("-falign-functions")
	#pragma GCC optimize("-fcse-skip-blocks")
	#pragma GCC optimize("-fcse-follow-jumps")
	#pragma GCC optimize("-fsched-interblock")
	#pragma GCC optimize("-fpartial-inlining")
	#pragma GCC optimize("no-stack-protector")
	#pragma GCC optimize("-freorder-functions")
	#pragma GCC optimize("-findirect-inlining")
	#pragma GCC optimize("-frerun-cse-after-loop")
	#pragma GCC optimize("inline-small-functions")
	#pragma GCC optimize("-finline-small-functions")
	#pragma GCC optimize("-ftree-switch-conversion")
	#pragma GCC optimize("-foptimize-sibling-calls")
	#pragma GCC optimize("-fexpensive-optimizations")
	#pragma GCC optimize("-funsafe-loop-optimizations")
	#pragma GCC optimize("inline-functions-called-once")
	#pragma GCC optimize("-fdelete-null-pointer-checks")
}
using namespace ka_chang;

(P.S.) 仅供娱乐