3? I am not sure whether i understand the question. ![]() I think 2 color can work too if we count the key's oringinal color. If you want to distinguish all the keys from each other, then you need n-1 corlors. If you can use color to paint a number on the key, then 1 color is enough ![]() |
My answer and understanding is the same as your 1st answer (3), as each key must be painted. For example, n=8: RRRRRRGB |
是每把钥匙只涂一种颜色呢?还是一把钥匙可涂多种色? 见菜花回来好高兴 ![]() ![]() ![]() ![]() ![]() 还有,ob马上就要回来当斑竹了。 本贴由[husonghu]最后编辑于:2006-1-19 19:3:5 |
每把只能涂一种颜色,相邻两钥匙不一定不同色,目的要能区分。比如我自己的钥匙圈,最长的是汽车钥匙,最胖的是锁车的,按这个方向第一把是办公室的。。。 是啊,我几天没来,论坛五光十色,热闹非凡,无奈我刚回来, 又马上要开学, 比较忙,因为几个朋友提到我,我不好意思也来凑个热闹。可能暂时没什么时间解题。再说那么多厉害的人,我算什么!题目没有明确解答也好,给人一个悬念,有空时也有东西能琢磨琢磨,可惜在飞机上我没带Labtop,否则琢磨问题倒是打发时间的好办法。 欢迎 ob 重挑重担!十分感谢 ob 的奉献精神! |
如果钥匙多,两种也可以:WBWWBBB... |
如果是三把,第三把涂成黑白条 |
USe Black to mark the number on each. Right? |
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