f**n
发帖数: 401 | 1 Suppose we have a one-directional graph. Define a path as a sequence of
vertices such that from each of its vertices there is an edge to the next
vertex in the sequence. So a path of three vertices would be recorded
somehow as v1->v2->v3.
Now I need to store a set of paths that are different from each other. For
example, path 1 is v1->v2->v3, path 2 is v2->v3->v4, path 3 is v2->v4, and
so on so forth. I need a container to store path 1, 2, and 3. The number of
paths can be much bigger than the t |
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d****p
发帖数: 685 | 2 正解。
我想说的时我和同事关于一个coding的分歧。
我喜欢用boost::tuple来表示一些临时的数据类型：经常我们在函数中局部定义。我的
同事认为用一个结构更可读。这点说他是对的。对比
typedef boost::tuple Position3D;
以及
struct Position3D
{
int x;
int y;
int z;
};
std::vector vertices;
//...
for (std::vector::iterator vertexItr = vertices.begin();
vertexItr != vertices.end(); ++vertexItr)
{
// vertexItr->x = 0; // local struct more readable
// vertexItr->first = 0; // boost::tuple
}
显然局部结构的代码更可读。
不... 阅读全帖 |
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T*******n
发帖数: 493 | 3 \documentclass{article}
\newcommand{\mc}[0]{\multicolumn}
\begin{document}
A vertical line belongs to the column to its left, except that the
left most vertical line belongs to the first column, so the first
column controls two vertical lines. You can then use
\verb|\multicolumn{}{}{}| to change things.
\begin{center}
\begin{tabular}{|c|c|c|}
\hline
x & y & z \\ \hline
\mc{1}{c|}{x} & y & z \\ \hline
\mc{1}{|c}{x} & y & |
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K****n
发帖数: 5970 | 4 看，这就是google这个网站全部的源代码：
大哥大嫂过年好！
content="text/html; charset=UTF-8">Google
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