add Seminar11

3 files changed, 151 insertions, 0 deletions

diff --git a/Seminar11/Graph-Impl/AdjacencyListGraph/AdjListGraph.cpp b/Seminar11/Graph-Impl/AdjacencyListGraph/AdjListGraph.cpp
new file mode 100644
index 0000000..3cbbdd0
--- /dev/null
+++ b/Seminar11/Graph-Impl/AdjacencyListGraph/AdjListGraph.cpp
@@ -0,0 +1,82 @@
+#include"AdjListGraph.h"
+
+using vertex_t = AdjListGraph::vertex_t;
+using weight_t = AdjListGraph::weight_t;
+
+AdjListGraph::AdjListGraph(size_t vertexCount) {
+    data = std::vector<std::list<Edge>>(vertexCount, std::list<Edge>());
+}
+
+void AdjListGraph::addVertex() {
+    data.push_back(std::list<Edge>());
+}
+
+void AdjListGraph::removeVertex(vertex_t v) {
+    if(!validVertex(v))
+        throw "Invalid vertex";
+
+    // Премахва самия връх
+    data.erase(data.begin() + v);
+
+    // За всеки от останалите върхове ако
+    // има елемент, който сочи към него трябва да се изтрие
+    // ако има елемент, който е по -  голям от него трябва да се намали с 1
+
+    for(auto& vertexList : data) {
+        vertexList.remove_if([&](Edge e) -> bool { return e.to == v; });
+
+        for(Edge& e : vertexList)
+            if(e.to > v) 
+                e.to--;
+    }
+}
+
+bool AdjListGraph::validVertex(vertex_t v) const {
+    return v < data.size();
+}
+
+void AdjListGraph::addEdge(vertex_t from, vertex_t to, weight_t w) {
+    if(!validVertex(from) || !validVertex(to))
+        throw "Invalid vertex";
+
+    data[from].push_back( {to, w} );
+    data[to].push_back( {from, w} );
+}
+
+void AdjListGraph::removeEdge(vertex_t from, vertex_t to) {
+    if(!validVertex(from) || !validVertex(to))
+        throw "Invalid vertex";
+
+    data[from].remove_if([&](Edge e) -> bool {return e.to == to; });   
+    data[to].remove_if([&](Edge e) -> bool {return e.to == from; });   
+}
+
+bool AdjListGraph::hasEdge(vertex_t from, vertex_t to) const {
+    if(!validVertex(from) || !validVertex(to))
+        throw "Invalid vertex";
+    
+    for(const Edge& e : data[from])
+        if(e.to == to)
+            return true;
+    
+    return false;
+}
+
+weight_t AdjListGraph::getWeight(vertex_t from, vertex_t to) const {
+     if(!validVertex(from) || !validVertex(to))
+        throw "Invalid vertex";
+    
+    for(const Edge& e : data[from])
+        if(e.to == to)
+            return e.weight;
+    
+    return 0;
+}
+
+std::vector<AdjListGraph::Edge> AdjListGraph::adjacent(vertex_t v) const {
+    return std::vector<Edge>(data[v].begin(), data[v].end());
+}
+
+size_t AdjListGraph::vertexCount() const {
+    return data.size();
+}
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diff --git a/Seminar11/Graph-Impl/AdjacencyListGraph/AdjListGraph.h b/Seminar11/Graph-Impl/AdjacencyListGraph/AdjListGraph.h
new file mode 100644
index 0000000..40446fd
--- /dev/null
+++ b/Seminar11/Graph-Impl/AdjacencyListGraph/AdjListGraph.h
@@ -0,0 +1,50 @@
+/*
+Тегловен неориентиран граф представен чрез списъци на съседство.
+
+Предимства:
+* Паметта която използваме е вече O(|V| + |E|)
+* Вземането на всички съседи е по - бързо
+
+Недостатъци:
+* Да проверим дали има ребро между два върха вече не е O(1)
+
+*/
+#ifndef ADJ_LIST_GRAPH_IMPL
+#define ADJ_LIST_GRAPH_IMPL
+
+#include<vector>
+#include<list>
+#include<algorithm>
+
+class AdjListGraph {
+    public:
+    using vertex_t = unsigned int;
+    using weight_t = unsigned int;
+
+    private:
+    struct Edge {
+        vertex_t to;
+        weight_t weight;
+    };
+
+    std::vector<std::list<Edge>> data;
+
+    public:
+    AdjListGraph(size_t n);
+
+    void addVertex();
+    void removeVertex(vertex_t);
+    bool validVertex(vertex_t) const;
+
+    void addEdge(vertex_t, vertex_t, weight_t);
+    void removeEdge(vertex_t, vertex_t);
+
+    weight_t getWeight(vertex_t, vertex_t) const;
+    bool hasEdge(vertex_t, vertex_t) const;
+
+    size_t vertexCount() const;
+
+    std::vector<Edge> adjacent(vertex_t) const;
+};
+
+#endif
\ No newline at end of file
diff --git a/Seminar11/Graph-Impl/AdjacencyListGraph/src.cpp b/Seminar11/Graph-Impl/AdjacencyListGraph/src.cpp
new file mode 100644
index 0000000..b0484e0
--- /dev/null
+++ b/Seminar11/Graph-Impl/AdjacencyListGraph/src.cpp
@@ -0,0 +1,19 @@
+#include<iostream>
+#include<list>
+#include<algorithm>
+#include"AdjListGraph.h"
+
+int main() {
+    AdjListGraph g(10);
+
+    g.addEdge(0, 1, 1);
+    g.addEdge(0, 2, 1);
+    g.addEdge(0, 3, 1);
+    g.addEdge(0, 4, 1);
+
+    auto res = g.adjacent(1);
+
+    for(auto i : res) {
+        std::cout << i.to << " ";
+    }
+}
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