说明：北京大学ACM题
Here is a geometric problem. You have an angle and some squares in the first quadrant of the plane rectangular coordinates. The vertex of the angle is fixed on the origin O of the coordinates, and both of i <pengfam> 在 2008-10-13 上传
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说明：北京大学ACM比赛题
The game of Scrabble is played with tiles. A tile either has a single letter written on it, or it is blank. In the latter case, the tile may be used to represent a letter of your choice. On your turn, you ar <pengfam> 在 2008-10-13 上传
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说明：北京大学ACM比赛题目
In 1742, Christian Goldbach, a German amateur mathematician, sent a letter to Leonhard Euler in which he made the following conjecture:
Every even number greater than 4 can be
written as the sum of <pengfam> 在 2008-10-13 上传
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说明：北京大学ACM比赛题目
Consider an infinite full binary search tree (see the figure below), the numbers in the nodes are 1, 2, 3, .... In a subtree whose root node is X, we can get the minimum number in this subtree by repeating <pengfam> 在 2008-10-13 上传
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说明：北京大学ACM比赛题目
Write a program to read four lines of upper case (i.e., all CAPITAL LETTERS) text input (no more than 72 characters per line) from the input file and print a vertical histogram that shows how many times eac <pengfam> 在 2008-10-13 上传
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