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Digital Watch
You have a digital watch showing the hour, the minute and the second in 24-hour notation. (example: 00:12:59, 23:45:00 etc.) At some time you look at your watch and observe that these six digits are ...
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砝码问题
WITH m1 AS (SELECT ROWNUM m1 FROM dual CONNECT BY LEVEL<=40),m2 AS (SELECT ROWNUM m2 FROM dual CONNECT BY LEVEL<=40),m3 AS (SELECT ROWNUM m3 FROM dual CONNECT BY LEVEL<=40),m4 AS (SELECT ROWNUM m4 FR...
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关于那个梯子问题
如图所示，两梯子交叉，长度分别为x和y，分别从两个墙角搭到另外一边的墙壁上，梯子交叉点距离地面高度为h墙壁跟地面是垂直的，地面长度为w有趣的是，在0<x<y<167的范围内，我们可以找到若干组整数组合(x,y,h)，使...
