18题——谁是凶手

int main(){
	char murder = 0;
	for (murder = 'A'; murder <= 'D'; murder++){
		if ((murder != 'A') + (murder == 'C') + (murder == 'D') + (murder == 'C') == 3){
			printf("%c\n", murder);
		}//先从A是凶手来试，看这三个条件加一起真的有几个，要是有三个为真，那么就测出谁是凶手来了
	}
	return 0;
}