puzzleup 2011

kachau

题都看不懂，哪位高手给翻译一下

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原帖由 newkid 于 2011-8-10 22:06 发表
The side lengths of three right triangles are all integers. The short leg (i.e. cathetus) of one of the triangles has the same length with the long leg of the second triangle and the hypotenuse of the third. What is the possible minimum value of this length?

3个直角三角形的各边长都是整数，某个三角形的短边、另一个三角形的长(直角)边，第3个三角形的斜边都是同一个长度，这个长度可能的最小值是什么？

kachau

x 短边
y 长边
n 斜边
with ttt as
(select level lv
    from dual
  connect by level < 50
  ),
tt as  
  (select x.lv x, y.lv y, c.lv c
    from ttt x, ttt y, ttt c
   where
   x.lv*x.lv+y.lv*y.lv=c.lv*c.lv and x.lv<y.lv
    )

   select min(t3.c) from tt t1,tt t2,tt t3 where t1.x=t2.y and t2.y=t3.c

答案15

[ 本帖最后由 kachau 于 2011-8-11 14:14 编辑 ]

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第一题
谁来解

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组里每人写下名、姓、年龄、出生地的卡片，每个卡片有4个项目
任取4个卡片，必有2个卡片有同样的项目值
最多3人具有同样的名、姓、年龄、出生地
组里最多能有几人

luyi6101

There are at most three people in the group having the same name. (ie. There may be 3 people named A, 3 people named B but there cannot be 4 people named C).
• There are at most three people in the group having the same surname.
• There are at most three people in the group having the same age.
• There are at most three people in the group having the same birthplace.

这几条的前提是需要满足任取四个卡片吗？

gyhgood

算法啊代码的灵魂啊～！为啥我写的代码都没魂呢～！！！！！！！！！

luyi6101

第一题完全没有思路。。

ccceleven

好难好难 耐心学习高手解法~

newkid

奥数哥很久不来了，要不然请他指导一下。去年他说要研究哥德巴赫猜想，不知道搞出来没有，报纸上也没见报道。