UVA 11401 Triangle Counting

作者: Rememberautumn 分类: uva 发布时间: 2014-07-28 11:39 阅读: 2,573

You are given n rods of length 1, 2…, n. You have to pick any 3 of them & build a triangle. How many distinct triangles can you make? Note that, two triangles will be considered different if they have at least 1 pair of arms with different length.

 

Input

 

The input for each case will have only a single positive integer (3<=n<=1000000). The end of input will be indicated by a case with n<3. This case should not be processed.

 

Output

 

For each test case, print the number of distinct triangles you can make.

 

Sample Input                                                  Output for Sample Input

58

0

322

思路:列出不等式进行优化

[codesyntax lang=”c++”]

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