एक द्विदलीय ग्राफ एक ग्राफ है जिसमें यदि दो रंगों का उपयोग करके ग्राफ को रंगना संभव है; एक समुच्चय के शीर्षों को एक ही रंग से रंगा जाता है। यह एक C++ प्रोग्राम है जो यह जांचने के लिए है कि ग्राफ़ द्विदलीय है या नहीं BFS का उपयोग कर रहा है।
एल्गोरिदम
Begin Function Bipartite(): 1) Assign a color to the source vertex 2) Color all the neighbors with another color except first one color. 3) Color all neighbor’s neighbor with First color. 4) Like this way, assign color to all vertices such that it satisfies all the constraints of k way coloring problem where k = 2. 5) While assigning colors, if we find a neighbor which is colored with same color as current vertex, then the graph cannot be colored with 2 vertices i.e.; graph is not Bipartite End
उदाहरण
#include <iostream> #include <queue> #define V 5 using namespace std; bool Bipartite(int G[][V], int s) { int colorA[V]; for (int i = 0; i < V; ++i) colorA[i] = -1; colorA[s] = 1; //Assign a color to the source vertex queue <int> q; //Create a queue of vertex numbers and enqueue source vertex for BFS traversal q.push(s); while (!q.empty()) { int w = q.front(); //dequeue a vertex q.pop(); for (int v = 0; v < V; ++v) //Find all non-colored adjacent vertices { if (G[w][v] && colorA[v] == -1) //An edge from w to v exists and destination v is not colored { colorA[v] = 1 - colorA[w]; //Assign alternate color to this adjacent v of w q.push(v); } else if (G[w][v] && colorA[v] == colorA[w]) //An edge from w to v exists and destination //v is colored with same color as u return false; } } return true; //if all adjacent vertices can be colored with alternate color } int main() { int G[][V] = {{ 0, 1, 0, 0}, { 1, 0, 0, 0}, { 0, 0, 0, 1}, { 1, 0, 1, 0}}; if (Bipartite(G, 0)) cout << "The Graph is Bipartite"<<endl; else cout << "The Graph is Not Bipartite"<<endl; return 0; }
आउटपुट
The Graph is Bipartite