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GraphWithMAP.cpp
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GraphWithMAP.cpp
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#include <bits/stdc++.h>
using namespace std;
// class tampleting
template <typename T>
class Giraff
{
public:
unordered_map<T, list<T>> adjList; // most suitable way, can have any differnet nodes
// vector<vector<T>> adjList(n);// when nodes are defiened from 0 to n
void add_edge(T u, T v, bool isDir = 0)
{
adjList[u].push_back(v);
if (isDir == 0)
adjList[v].push_back(u);
}
void display_graph()
{
for (auto i : adjList)
{
cout << endl;
cout << i.first << "->";
for (auto j : i.second)
{
cout << j << ",";
}
}
}
void bfs()
{
// need a map, and a queue
map<T, bool> visited;
queue<T> Q;
// mark all as unvisited on map
for (auto i : adjList)
{
visited[i.first] = false;
}
cout << endl;
// deciding the first node to start with
unordered_map<int, list<int>>::iterator itr; // itrator should have defined typename
itr = adjList.begin(); // itrator to adjList first element, ie pointer to its first element
T first_node = itr->first; // acessing first element of adjList
// 1.Pushing in Q
Q.push(first_node);
visited[first_node] = true;
while (!Q.empty())
{
// taking value of front in Queue
T temp = Q.front();
Q.pop();
cout << temp << " ";
// 2.adding adjecent elements to queue
for (auto i : adjList[temp])
{
if (visited[i] == false)
{
// 3.marking pushed element as visited
visited[i] = true;
Q.push(i);
}
}
}
}
void dfs(int n, map<T, bool> &visited)
{
// printing the element
cout << n << " ";
// 2.calling dfs for its adjecent elemnts (not visited)
for (auto i : adjList[n])
{
if (visited[i] == false)
{
// 3.making visited
visited[i] = true;
dfs(i, visited);
}
}
}
void callDfs()
{
cout << endl;
// 1.map for visited
map<T, bool> visited;
for (auto i : adjList)
{
visited[i.first] = false;
}
// traversing adjList elements, in case if disconnected graph
for (auto i : adjList)
{
if (visited[i.first] == false)
{
// 3.making visited
visited[i.first] = true;
dfs(i.first, visited);
}
}
}
string cycleDetection(vector<vector<int>> &edges, int n, int m)
{
// Write your code here.
// adj list made
for (auto i : edges)
{
adjList[i[0]].push_back(i[1]);
adjList[i[1]].push_back(i[0]);
}
// bfs to detect cycle
/// visited map
map<int, bool> visited;
/// traversal queue
queue<int> Q;
/// parent queue
queue<int> P;
///traversal for disconnected graph
for (auto i : adjList)
{
if (!visited[i.first])
{
///pushing elemnt
Q.push(i.first);
visited[i.first] = true;
//pushing parent
P.push(NULL);
while (!Q.empty())
{
int temp = Q.front();
Q.pop();
///parent of poped element taken
int parent = P.front();
P.pop();
for (auto j : adjList[temp])
{
if (!visited[j])
{
Q.push(j);
P.push(temp);
visited[j] = true;
}
///if encountered *visited* adjecent element is not the preant then there must be cycle
else if (j != parent)
return "Yes";
}
}
}
}
return "No";
}
};
int main()
{
Giraff<int> G1;
cout << "Give the map:";
cout << "\n Number of nodes: ";
int n, u, v;
cin >> n;
for (int i = 0; i < n; i++)
{
cin >> u >> v;
G1.add_edge(u, v);
}
G1.display_graph();
// GRaph input;/ representation executed
G1.bfs();
G1.callDfs();
// DFS,BfS executed
}