OpenSoure_Repos/TheAlgorithms-C-Plus-Plus
1
0
Fork 0
mirror of https://hub.njuu.cf/TheAlgorithms/C-Plus-Plus.git synced 2023-10-11 13:05:55 +08:00
Code Issues Packages Projects Releases Wiki Activity

feat: Define graph structure in breadth_first_search (#1076)

Browse Source 
* feat: Define graph structure in breadth_first_search

* using instead of typedef
This commit is contained in:
Filip Hlasek 2020-09-18 10:34:18 -07:00 committed by GitHub
parent 88fe6911df
commit d4b54b8294
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 20 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
graph/breadth_first_search.cpp
View File

@ -54,6 +54,17 @@
* \brief Graph algorithms
*/
namespace graph {
/**
* \brief Representation of the graph as an adjacency list.
*
* For every vertex, there is a list of its neighbors in the order in which
* they were added to the graph. By default, the edges are directed, but
* an undirected graph can be represented simply by storing each each as
* two directed edges in both directions.
*/
using adjacency_list = std::vector<std::vector<int>>;
/**
* \brief
* Adds a directed edge from vertex u to vertex v.
@ -63,7 +74,7 @@ namespace graph {
* @param v second vertex
*
*/
void add_directed_edge(std::vector<std::vector<int>> *graph, int u, int v) {
void add_directed_edge(adjacency_list *graph, int u, int v) {
(*graph)[u].push_back(v);
}
@ -78,7 +89,7 @@ void add_directed_edge(std::vector<std::vector<int>> *graph, int u, int v) {
* @param v second vertex
*
*/
void add_undirected_edge(std::vector<std::vector<int>> *graph, int u, int v) {
void add_undirected_edge(adjacency_list *graph, int u, int v) {
add_directed_edge(graph, u, v);
add_directed_edge(graph, v, u);
}
@ -93,11 +104,10 @@ void add_undirected_edge(std::vector<std::vector<int>> *graph, int u, int v) {
* search.
*
*/
std::vector<bool> breadth_first_search(
const std::vector<std::vector<int>> &graph, int start) {
std::vector<bool> breadth_first_search(const adjacency_list &graph, int start) {
/// vector to keep track of visited vertices
std::vector<bool> visited(graph.size(), false);
/// a queue that stores vertices that need to be further explored
/// queue that stores vertices that need to be further explored
std::queue<int> tracker;
/// mark the starting vertex as visited
@ -117,11 +127,13 @@ std::vector<bool> breadth_first_search(
}
return visited;
}
} // namespace graph
void tests() {
/** Test function */
static void tests() {
/// Test 1 Begin
std::vector<std::vector<int>> graph(4, std::vector<int>());
graph::adjacency_list graph(4, std::vector<int>());
graph::add_undirected_edge(&graph, 0, 1);
graph::add_undirected_edge(&graph, 1, 2);
graph::add_undirected_edge(&graph, 2, 3);
@ -168,7 +180,7 @@ int main() {
std::cout << "Enter the number of edges: ";
std::cin >> edges;
std::vector<std::vector<int>> graph(vertices);
graph::adjacency_list graph(vertices);
std::cout << "Enter space-separated pairs of vertices that form edges: "
<< std::endl;