safe.cpp

农夫过河的扩展

int farmer(int location){
	return(0!=(location&0x20));
}

int ob1(int location){
	return(0!=(location&0x10));
}

int ob2(int location){
	return(0!=(location&0x08));
}

int ob3(int location){
	return(0!=(location&0x04));
}

int ob4(int location){
	return(0!=(location&0x02));
}

int ob5(int location){
	return(0!=(location&0x01));
}

int isSafe(int location){
	if (ob1(location)==ob2(location)&&
		ob1(location)!=farmer(location))
		return 0;
	if (ob2(location)==ob4(location)&&
		ob2(location)!=farmer(location))
		return 0;
	if (ob1(location)==ob3(location)&&
		ob1(location)!=farmer(location))
		return 0;
	if (ob3(location)==ob5(location)&&
		ob3(location)!=farmer(location))
		return 0;
	return 1;
}