rt，感觉和网上的不一样

inline int read(){
	int f=1,x=0;
	char c=getchar();
	if(c=='-') f=-1;
	else x=c-'0';
	while(1){
		char h=getchar();
		if(h>='0' && h<='9'){
			x*=10;
			x+=h-'0';
		}
		else break;
	}
	return f*x;
}