baoshuo/OI-codes
baoshuo/OI-codes
0
1
Fork 0
mirror of https://git.sb/baoshuo/OI-codes.git synced 2024-09-16 20:05:26 +00:00
Code Releases Activity

feat: graph utils

Browse Source
This commit is contained in:
Baoshuo Ren 2022-08-27 11:00:59 +08:00
parent 1104a5b26c
commit 2519ed3a95
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
1 changed files with 37 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
utils/graph.h Normal file
View File

@ -0,0 +1,37 @@
#include <tuple>
#include <vector>
template <typename T>
class Graph {
private:
// Indexes of the first edge of each vertex.
std::vector<std::size_t> head;
// Edges of the graph.
// Elements in a std::tuple are <to, weight, next>
std::vector<std::tuple<std::size_t, T, std::size_t>> edge;
public:
Graph() = default;
Graph(const int &_n)
: head(n, -1) {}
// Add an edge from u to v with weight w.
void add(const std::size_t &_u, const std::size_t &_v, const T &_w) {
edge.emplace_back(_v, _w, head[_u]);
head[_u] = edge.size() - 1;
}
// Add an undirected edge from u to v with weight `w`.
void add_undirected(const std::size_t &_u, const std::size_t &_v, const T &_w) {
add(_u, _v, _w);
add(_v, _u, _w);
}
// Add an undirected edge from u to v with weight `w`, specifies the weight `rw` of reverse edge.
void add_undirected(const std::size_t &_u, const std::size_t &_v, const T &_w, const T &_rw) {
add(_u, _v, _w);
add(_v, _u, _rw);
}
};