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  1. Prepare
  2. Algorithms
  3. Graph Theory
  4. Breadth First Search: Shortest Reach
  5. Discussions

Breadth First Search: Shortest Reach

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698 Discussions

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  • ArpinFidel
     + 0 comments

    how is this 55 points while synchronous-shopping is 40

  • bensa7044
     + 0 comments

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  • chroniclestorie1
     + 0 comments

    import java.util.*;

    class ResultAlt {

    /*
 * Complete the 'bfs' function below.
 *
 * The function is expected to return an INTEGER_ARRAY.
 * The function accepts following parameters:
 *  1. INTEGER n
 *  2. INTEGER m
 *  3. 2D_INTEGER_ARRAY edges
 *  4. INTEGER s
 */

public static List<Integer> bfs(int n, int m, List<List<Integer>> edges, int s) {
    // Build adjacency list
    List<List<Integer>> adj = new ArrayList<>();
    for (int i = 0; i < n; i++) {
        adj.add(new ArrayList<>());
    }
    for (List<Integer> edge : edges) {
        int u = edge.get(0) - 1; // 0-based indexing
        int v = edge.get(1) - 1;
        adj.get(u).add(v);
        adj.get(v).add(u);
    }

    // Distance array initialized to -1
    int[] dist = new int[n];
    Arrays.fill(dist, -1);

    // BFS
    Queue<Integer> q = new LinkedList<>();
    q.add(s - 1);
    dist[s - 1] = 0;

    while (!q.isEmpty()) {
        int u = q.poll();
        for (int v : adj.get(u)) {
            if (dist[v] == -1) {
                dist[v] = dist[u] + 6; // edge weight = 6
                q.add(v);
            }
        }
    }

    // Prepare result (excluding source node)
    List<Integer> result = new ArrayList<>();
    for (int i = 0; i < n; i++) {
        if (i != (s - 1)) {
            result.add(dist[i]);
        }
    }

    return result;
}

    }

  • CS_2212256_T
     + 0 comments
    class Result {

    /*
     * Complete the 'bfs' function below.
     *
     * The function is expected to return an INTEGER_ARRAY.
     * The function accepts following parameters:
     *  1. INTEGER n
     *  2. INTEGER m
     *  3. 2D_INTEGER_ARRAY edges
     *  4. INTEGER s
     */

    public static List<Integer> bfs(int n, int m, List<List<Integer>> edges, int s) {
    // Write your code here
        if (n < 1 || edges == null || edges.size() < 1 || s < 1) return null;

        // Step 1
        Set<Integer> [] tree = new Set[n];
        for (List<Integer> edge : edges) {
            int a = edge.get(0);
            int b = edge.get(1);
            if (tree[a-1] == null) {
                tree[a-1] = new HashSet<Integer>();
            }
            tree[a-1].add(b);
            if (tree[b-1] == null) {
                tree[b-1] = new HashSet<Integer>();
            }
            tree[b-1].add(a);
        }

        // Step 2
        List<Integer> res = new ArrayList<Integer>();
        
        // O(n) start from S
        for (int i = 0; i < n - 1; i++) {
            res.add(-1);    
        }
        
        Set<Integer> root = tree[s-1];
        if (root == null) return res;
        
        Deque<Integer> queue = new LinkedList<Integer>();
        for (Integer r : root) {
            queue.add(r);
        }
        int height = 1;
        boolean [] visited = new boolean [n];
        visited[s-1] = true;
        while (!queue.isEmpty()) {
            Deque<Integer> queuen = new LinkedList<Integer>();
            while (!queue.isEmpty()) {
                int v = queue.poll().intValue();
                if (!visited[v-1]) {
                    visited[v-1] = true;
                    // update distances
                    if (v > s)
                        res.set(v-2, height*6);
                    else 
                        res.set(v-1, height*6);
                    if (tree[v-1] != null) {
                        for (Integer r : tree[v-1]) {
                            queuen.add(r);
                        } 
                    }
                } 
            }
            queue = queuen;
            height++;
        }
        
        // return res
        return res;
    }

}

  • dorirgob
     + 0 comments

    Java 15:

    public static List<Integer> bfs(
    int n, int m, List<List<Integer>> edges, int s) {
  List<List<Integer>> graph = new ArrayList<>();
  List<Integer> distances = new ArrayList<>();

  for (int i = 0; i <= n; i++) {
    graph.add(new ArrayList<>());
  }

  for (List<Integer> edge : edges) {
    graph.get(edge.get(0)).add(edge.get(1));
    graph.get(edge.get(1)).add(edge.get(0));
  }

  int[] dist = bfsExplore(n, s, graph);
  System.out.println(Arrays.toString(dist));
  for (int i = 1; i <= n; i++) {
    if (i != s) {
      distances.add(dist[i]);
    }
  }
  return distances;
}

private static int[] bfsExplore(int n, int s, List<List<Integer>> graph) {
  int weight = 6;
  int[] distances = new int[n + 1];
  Arrays.fill(distances, -1);
  boolean[] visited = new boolean[n + 1];
  Queue<int[]> queue = new LinkedList<>();
  queue.offer(new int[] {s, 0});
  visited[s] = true;

  while (!queue.isEmpty()) {
    int[] current = queue.poll();
    distances[current[0]] = weight * current[1];

    for (int neighbor : graph.get(current[0])) {
      if (!visited[neighbor]) {
        queue.offer(new int[] {neighbor, current[1] + 1});
        visited[neighbor] = true;
      }
    }
  }
  return distances;
}