打了这么多年星际，第一次知道矩阵操作，效果极其华丽，但操作相对简单。

昨天在hkust4209被发现。

大家实验了一下，是可行的，我用—108b实验的。

 

详细参见

下午毕业论文预答辩，我论文的内容在讨论班上都不知道讲过几遍了，我自己都快讲吐了，我老板也听睡着了。

 

走完这个过场，回到寝室，看到桌子上那盆兰花。

想去年，差不多也就是这个时候，突然寄情于花木，就在五角场花卉市场买了这盆兰花。想刚买来的时候绿缨儿的很是娇嫩，放我寝室侍侯了快一年了，却变的没有生机了很多，还有一些的枯叶。兰花这物很是金贵，就象个人一样，养起来要很多经验和技巧，侍侯的少了不行，多了也不行，水要浇灌的恰倒好处，这个复杂的事情搁到我这个外行这里也只能好心办错事，再加上这一年老往国外和香港跑，难免疏忽了照顾。我往盆里撒了点水，又用湿的面斤纸给它擦了擦叶子，但仍然还有很多的黄叶，看着她的憔悴，我的心里不落忍。过两天我就又得去香港，而且不久我将就和复旦和上海说拜拜，我没法象lyon那样走到哪里就把他的花抱到哪里，而且这喜欢幽静的兰花也受不了这个。她也许应该回到属于她的地方。

 

擦洗得了，我把她放到个袋子里，骑上车又把她带回五角场花卉市场，里面是花的海洋，也是这兰花来的地方。当初那个店铺似乎已经易主，我就又寻了家有不少兰花的地方。老板娘很面善。开始还以为我是来退花的，忙告述我说这花不是她家卖出去的。我说我是送，我是要找个会养的人家帮我把她收留了，我不想让她跟着我遭罪。老板娘看起来是很懂花也爱花的，看出这花在我这里没少受委屈。告述我说放她这里，她好好侍侯着，明年说不定就能开花。她把我的那盆端到和很多兰花盆子一起，往上喷了点水雾，我觉得她又仿佛象当初我买她的时候，绿缨缨的那么好看。老板娘说下次我来买东西她给我便宜点，我笑说我就是再来也不来买这东西了，笨的弄不来，下次再来我就来看看她长的好不好。转身走时我叹了口气，我将不知何时下次再来。

 

过不多久，她还会那么好看，开出来花，花香溢满这个屋子。

 

A puzzle:) easier than the last one.

You are to cut out some pieces of paper.

You must be able to place your pieces of paper on an 8x8 checkerboard so that they exactly cover the checkerboard, minus _any_ one square.

That is, once your pieces are cut, if I identify to you _any_ of the squares on the checkerboard, you must be able to arrange all your pieces of paper (flat, not folded) on the checkerboard so that:

a) the pieces of paper don't overlap
b) the pieces of paper don't cover any area outside the checkerboard
c) the pieces of paper cover all of the checkerboard except the square I chose

The problem: figure out how to do this with three pieces of paper.

For example, it is easy to see how to do this with 63 pieces of paper -- use 63 1x1 squares of paper. Or, 32 pieces --- use a 4x8 piece and 31 1x1 pieces...
　

Remark: from http://www.cs.ucr.edu/~neal/home/puzzles.html

An interesting puzzle:

 

I write two different numbers, one on each hand.

You choose one of my hands at random, I show you the number on that hand.

You now guess whether the number you've seen is larger than the number you
haven't seen.

Find a strategy for guessing such that, no matter what two numbers I write,
you have GREATER THAN a 50% chance of being correct.

Remark: from http://www.cs.ucr.edu/~neal/home/puzzles.html

你试试

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