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/**
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* File: graph_adjacency_list.cpp
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* Created Time: 2023-02-09
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* Author: what-is-me (whatisme@outlook.jp), krahets (krahets@163.com)
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*/
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#include "../utils/common.hpp"
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/* 基于邻接表实现的无向图类 */
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class GraphAdjList {
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public:
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// 邻接表，key：顶点，value：该顶点的所有邻接顶点
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unordered_map<Vertex *, vector<Vertex *>> adjList;
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/* 在 vector 中删除指定节点 */
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void remove(vector<Vertex *> &vec, Vertex *vet) {
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for (int i = 0; i < vec.size(); i++) {
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if (vec[i] == vet) {
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vec.erase(vec.begin() + i);
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break;
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}
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}
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}
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/* 构造方法 */
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GraphAdjList(const vector<vector<Vertex *>> &edges) {
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// 添加所有顶点和边
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for (const vector<Vertex *> &edge : edges) {
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addVertex(edge[0]);
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addVertex(edge[1]);
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addEdge(edge[0], edge[1]);
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}
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}
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/* 获取顶点数量 */
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int size() {
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return adjList.size();
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}
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/* 添加边 */
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void addEdge(Vertex *vet1, Vertex *vet2) {
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if (!adjList.count(vet1) || !adjList.count(vet2) || vet1 == vet2)
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throw invalid_argument("不存在顶点");
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// 添加边 vet1 - vet2
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adjList[vet1].push_back(vet2);
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adjList[vet2].push_back(vet1);
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}
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/* 删除边 */
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void removeEdge(Vertex *vet1, Vertex *vet2) {
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if (!adjList.count(vet1) || !adjList.count(vet2) || vet1 == vet2)
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throw invalid_argument("不存在顶点");
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// 删除边 vet1 - vet2
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remove(adjList[vet1], vet2);
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remove(adjList[vet2], vet1);
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}
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/* 添加顶点 */
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void addVertex(Vertex *vet) {
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if (adjList.count(vet))
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return;
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// 在邻接表中添加一个新链表
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adjList[vet] = vector<Vertex *>();
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}
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/* 删除顶点 */
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void removeVertex(Vertex *vet) {
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if (!adjList.count(vet))
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throw invalid_argument("不存在顶点");
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// 在邻接表中删除顶点 vet 对应的链表
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adjList.erase(vet);
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// 遍历其他顶点的链表，删除所有包含 vet 的边
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for (auto &adj : adjList) {
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remove(adj.second, vet);
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}
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}
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/* 打印邻接表 */
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void print() {
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cout << "邻接表 =" << endl;
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for (auto &adj : adjList) {
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const auto &key = adj.first;
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const auto &vec = adj.second;
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cout << key->val << ": ";
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printVector(vetsToVals(vec));
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}
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}
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};
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// 测试样例请见 graph_adjacency_list_test.cpp
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