How can I implement graph algorithms in C?

How can I implement graph algorithms in C?

You can implement graph algorithms in C by using data structures like adjacency lists or matrices. Which algorithm are you interested in?

I'm interested in Dijkstra's algorithm.

Great choice! Dijkstra's algorithm finds the shortest path from a source node to all other nodes. Would you like a code example?

Yes, please provide a code example.

Here's a simple implementation of Dijkstra's algorithm in C:

#include <stdio.h>
#include <limits.h>
#define V 9

int minDistance(int dist[], int sptSet[]) {
    int min = INT_MAX, min_index;
    for (int v = 0; v < V; v++) {
        if (sptSet[v] == 0 && dist[v] <= min) {
            min = dist[v];
            min_index = v;
        }
    }
    return min_index;
}

void dijkstra(int graph[V][V], int src) {
    int dist[V];
    int sptSet[V];
    for (int i = 0; i < V; i++) {
        dist[i] = INT_MAX;
        sptSet[i] = 0;
    }
    dist[src] = 0;
    for (int count = 0; count < V - 1; count++) {
        int u = minDistance(dist, sptSet);
        sptSet[u] = 1;
        for (int v = 0; v < V; v++) {
            if (!sptSet[v] && graph[u][v] && dist[u] != INT_MAX && dist[u] + graph[u][v] < dist[v]) {
                dist[v] = dist[u] + graph[u][v];
            }
        }
    }
    printf("Vertex Distance from Source\n");
    for (int i = 0; i < V; i++) {
        printf("%d \t %d\n", i, dist[i]);
    }
}

Let me know if you need further explanation!