std::ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);

和

inline int read()
{
	int x=0;
	char c=getchar();
	bool f=0;
	while (c<'0'||c>'9')
	{
		if (c=='-') f=1;
		c=getchar();
	}
	while (c>='0'&&c<='9')
	{
		x=(x<<3)+(x<<1)+c-'0';
		c=getchar();
	}
	return f?-x:x;
}

哪个更快一点？