August 2017
Intermediate to advanced
360 pages
8h 35m
Chinese
Content preview from 算法技术手册（原书第2 版）
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图算法
｜
135
图算法
图 6-8：在示例无向图上计算 pred；图为在 5 个顶点被染为黑色后的快照
深度优先搜索
能够在数组中存储它遍历图时的信息。它对图的唯一要求是能够遍历给定
顶点的所有邻接顶点。这样的特性使得我们能够在复杂的信息上很容易地执行
深度优先
搜索
，并且
dfsVisit
函数在访问原图时不会对图做出改动。
6.2.3 解决方案
例
6-1
包含了深度优先搜索的
C++
实现。注意，顶点的颜色信息只用在
dfsVisit
函数中。
例
6-1
：深度优先搜索实现
//
访问图中的顶点
u
并更新信息
void dfsVisit (Graph const &graph, int u, /*
输入
*/
vector<int> &pred, vector<vertexColor> &color) { /*
输出
*/
color[u] = Gray;
//
处理
u
的所有邻接顶点
for (VertexList::const_iterator ci = graph.begin (u);
ci != graph.end (u); ++ci) {
int v = ci->first;
//
立刻搜索未被访问的顶点并记录在
pred[]
中
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