( I need the output to be:  Enter the number of vertices and edges: Enter edges in the format (from to weight): Enter the source vertex: Shortest paths from source vertex 2: Vertex 0: 4 Vertex 1: 3 Vertex 2: 0 the output i keep getting from the code below is Enter the number of vertices and edges: Enter edges in the format (from to weight): Enter the source vertex: Shortest paths from source vertex 2: Vertex 0: No path Vertex 1: No path Vertex 2: 0) #include <iostream> #include <vector> #include <queue> #include <climits> using namespace std; vector<int> dijkstra(int V, vector<vector<pair<int, int>>> adj, int S, vector<int>& dist) {    dist.resize(V, INT_MAX); // dist[i] will hold the shortest distance from S to i    vector<int> prev(V, -1); // prev[i] will hold the penultimate vertex in the shortest path from S to i        // Priority queue to store vertices that are being processed    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pq;        // Initialize source vertex distance as 0 and push it to the priority queue    dist[S] = 0; // Adjusted: Set distance from source to itself as 0    pq.push({0, S});        // Dijkstra's algorithm    while (!pq.empty()) {        int u = pq.top().second;        pq.pop();                // Visit each neighbor of u        for (auto& edge : adj[u]) {            int v = edge.first; // neighbor vertex            int weight = edge.second; // weight of the edge from u to v                        // If a shorter path is found, update distance and penultimate vertex            if (dist[u] + weight < dist[v]) {                dist[v] = dist[u] + weight;                prev[v] = u;                pq.push({dist[v], v});            }        }    }        return prev; // Return the penultimate vertex array } int main() {    int v, e, source;    cout << "Enter the number of vertices and edges: ";    cin >> v >> e;        // Initialize the graph with n vertices    vector<vector<pair<int, int>>> adj(v);        // Read edges and weights    cout << "Enter edges in the format (from to weight):" << endl;    for (int i = 0; i < e; ++i) {        int from, to, weight;        cin >> from >> to >> weight;        adj[from].push_back({to, weight});    }        cout << "Enter the source vertex: ";    cin >> source;        // Find shortest paths from source to all vertices    vector<int> dist;    vector<int> prev_vertices = dijkstra(v, adj, source, dist);        // Print shortest paths    cout << "Shortest paths from source vertex " << source << ":\n";    for (int i = 0; i < v; ++i) {        cout << "Vertex " << i << ": ";        if (dist[i] == INT_MAX) {            cout << "No path\n";        } else {            cout << dist[i] << endl;        }    }        return 0; }

C++ for Engineers and Scientists
4th Edition
ISBN:9781133187844
Author:Bronson, Gary J.
Publisher:Bronson, Gary J.
Chapter6: Modularity Using Functions
Section6.4: A Case Study: Rectangular To Polar Coordinate Conversion
Problem 9E: (Numerical) Write a program that tests the effectiveness of the rand() library function. Start by...
icon
Related questions
Question
( I need the output to be:  Enter the number of vertices and edges: Enter edges in the format (from to weight): Enter the source vertex: Shortest paths from source vertex 2: Vertex 0: 4 Vertex 1: 3 Vertex 2: 0 the output i keep getting from the code below is Enter the number of vertices and edges: Enter edges in the format (from to weight): Enter the source vertex: Shortest paths from source vertex 2: Vertex 0: No path Vertex 1: No path Vertex 2: 0)
#include <iostream>
#include <vector>
#include <queue>
#include <climits>
using namespace std;
vector<int> dijkstra(int V, vector<vector<pair<int, int>>> adj, int S, vector<int>& dist) {
   dist.resize(V, INT_MAX); // dist[i] will hold the shortest distance from S to i
   vector<int> prev(V, -1); // prev[i] will hold the penultimate vertex in the shortest path from S to i
   
   // Priority queue to store vertices that are being processed
   priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pq;
   
   // Initialize source vertex distance as 0 and push it to the priority queue
   dist[S] = 0; // Adjusted: Set distance from source to itself as 0
   pq.push({0, S});
   
   // Dijkstra's algorithm
   while (!pq.empty()) {
       int u = pq.top().second;
       pq.pop();
       
       // Visit each neighbor of u
       for (auto& edge : adj[u]) {
           int v = edge.first; // neighbor vertex
           int weight = edge.second; // weight of the edge from u to v
           
           // If a shorter path is found, update distance and penultimate vertex
           if (dist[u] + weight < dist[v]) {
               dist[v] = dist[u] + weight;
               prev[v] = u;
               pq.push({dist[v], v});
           }
       }
   }
   
   return prev; // Return the penultimate vertex array
}
int main() {
   int v, e, source;
   cout << "Enter the number of vertices and edges: ";
   cin >> v >> e;
   
   // Initialize the graph with n vertices
   vector<vector<pair<int, int>>> adj(v);
   
   // Read edges and weights
   cout << "Enter edges in the format (from to weight):" << endl;
   for (int i = 0; i < e; ++i) {
       int from, to, weight;
       cin >> from >> to >> weight;
       adj[from].push_back({to, weight});
   }
   
   cout << "Enter the source vertex: ";
   cin >> source;
   
   // Find shortest paths from source to all vertices
   vector<int> dist;
   vector<int> prev_vertices = dijkstra(v, adj, source, dist);
   
   // Print shortest paths
   cout << "Shortest paths from source vertex " << source << ":\n";
   for (int i = 0; i < v; ++i) {
       cout << "Vertex " << i << ": ";
       if (dist[i] == INT_MAX) {
           cout << "No path\n";
       } else {
           cout << dist[i] << endl;
       }
   }
   
   return 0;
}
 
Expert Solution
steps

Step by step

Solved in 2 steps with 1 images

Blurred answer
Knowledge Booster
Stack
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
C++ for Engineers and Scientists
C++ for Engineers and Scientists
Computer Science
ISBN:
9781133187844
Author:
Bronson, Gary J.
Publisher:
Course Technology Ptr