Add GraphX for Java

GraphX.java

@@ -0,0 +1,255 @@
+
+
+//COPY THE BLACKBOX, there is no need to change anything in it.
+//Check the main function at bottom for USAGE
+
+//****************BLACKBOX START*****************
+//START COPYING FROM HERE
+
+import java.util.*;
+
+class Pair {
+    int first, second;
+
+    public Pair(int first, int second) {
+        this.first = first;
+        this.second = second;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Pair pair = (Pair) o;
+        return first == pair.first && second == pair.second;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(first, second);
+    }
+}
+
+class Triple {
+    int first, second, third;
+
+    public Triple(int first, int second, int third) {
+        this.first = first;
+        this.second = second;
+        this.third = third;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Triple triple = (Triple) o;
+        return first == triple.first && second == triple.second && third == triple.third;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(first, second, third);
+    }
+}
+
+class EdgePair {
+    int node;
+    int weight;
+
+    public EdgePair(int node, int weight) {
+        this.node = node;
+        this.weight = weight;
+    }
+}
+
+class Hash {
+    private Map<Triple, Integer> hashTable;
+
+    public Hash() {
+        hashTable = new HashMap<>();
+    }
+
+    public int hash(int x) {
+        return hash(new Triple(x, 0, 0));
+    }
+
+    public int hash(Pair x) {
+        return hash(new Triple(x.first, x.second, 0));
+    }
+
+    public int hash(Triple x) {
+        if (hashTable.containsKey(x)) {
+            return hashTable.get(x);
+        }
+        int newHash = hashTable.size();
+        hashTable.put(x, newHash);
+        return newHash;
+    }
+}
+
+class Graph {
+    private boolean isDirected;
+    public List<List<EdgePair>> adj;
+    public int n;
+    public int N = 5000000;
+    public Hash h;
+
+    public Graph(int n_, boolean isDirected_) {
+        n = n_;
+        isDirected = isDirected_;
+        adj = new ArrayList<>(N);
+        for (int i = 0; i < N; i++) {
+            adj.add(new ArrayList<>());
+        }
+        h = new Hash();
+    }
+
+    public Graph(int n_) {
+        this(n_, true);
+    }
+
+    public int hash(int u, int v) {
+        return h.hash(new Pair(u, v));
+    }
+
+    public int hash(int u, int v, int k) {
+        return h.hash(new Triple(u, v, k));
+    }
+
+    public void addEdge(int uR, int vR, int c) {
+        int u = h.hash(uR);
+        int v = h.hash(vR);
+        addEdgeInternal(u, v, c);
+    }
+
+    public void addEdge(int uR, int vR) {
+        addEdge(uR, vR, 0);
+    }
+
+    public void addEdge(Pair uR, Pair vR, int c) {
+        int u = h.hash(uR);
+        int v = h.hash(vR);
+        addEdgeInternal(u, v, c);
+    }
+
+    public void addEdge(Pair uR, Pair vR) {
+        addEdge(uR, vR, 0);
+    }
+
+    public void addEdge(Triple uR, Triple vR, int c) {
+        int u = h.hash(uR);
+        int v = h.hash(vR);
+        addEdgeInternal(u, v, c);
+    }
+
+    public void addEdge(Triple uR, Triple vR) {
+        addEdge(uR, vR, 0);
+    }
+
+    private void addEdgeInternal(int u, int v, int c) {
+        addEdgeWeightedUndirected(u, v, c);
+        if (!isDirected) {
+            addEdgeWeightedUndirected(v, u, c);
+        }
+    }
+
+    private void addEdgeWeightedUndirected(int u, int v, int c) {
+        EdgePair p = new EdgePair(v, c);
+        adj.get(u).add(p);
+    }
+}
+
+class BFS {
+    private int[] minDistFromSource;
+    private boolean[] visited;
+    private Graph g;
+
+    public BFS(Graph g_) {
+        g = g_;
+        clear();
+    }
+
+    public void clear() {
+        minDistFromSource = new int[g.N];
+        Arrays.fill(minDistFromSource, -1);
+        visited = new boolean[g.N];
+        Arrays.fill(visited, false);
+    }
+
+    public void run(int sourceR) {
+        int source = g.h.hash(sourceR);
+        runInternal(source);
+    }
+
+    public void run(Pair sourceR) {
+        int source = g.h.hash(sourceR);
+        runInternal(source);
+    }
+
+    public void run(Triple sourceR) {
+        int source = g.h.hash(sourceR);
+        runInternal(source);
+    }
+
+    public int minDist(int targetR) {
+        int target = g.h.hash(targetR);
+        return minDistInternal(target);
+    }
+
+    public int minDist(Pair targetR) {
+        int target = g.h.hash(targetR);
+        return minDistInternal(target);
+    }
+
+    public int minDist(Triple targetR) {
+        int target = g.h.hash(targetR);
+        return minDistInternal(target);
+    }
+
+    public boolean isVisited(int targetR) {
+        int target = g.h.hash(targetR);
+        return isVisitedInternal(target);
+    }
+
+    public boolean isVisited(Pair targetR) {
+        int target = g.h.hash(targetR);
+        return isVisitedInternal(target);
+    }
+
+    public boolean isVisited(Triple targetR) {
+        int target = g.h.hash(targetR);
+        return isVisitedInternal(target);
+    }
+
+    private void runInternal(int source) {
+        Queue<Integer> q = new LinkedList<>();
+        q.add(source);
+
+        visited[source] = true;
+        minDistFromSource[source] = 0;
+
+        while (!q.isEmpty()) {
+            int curNode = q.poll();
+            for (int i = 0; i < g.adj.get(curNode).size(); i++) {
+                int adjNode = g.adj.get(curNode).get(i).node;
+                if (visited[adjNode] == false) {
+                    visited[adjNode] = true;
+                    minDistFromSource[adjNode] = minDistFromSource[curNode] + 1;
+                    q.add(adjNode);
+                }
+            }
+        }
+    }
+
+    private int minDistInternal(int target) {
+        return minDistFromSource[target];
+    }
+
+    private boolean isVisitedInternal(int target) {
+        return visited[target];
+    }
+}
+
+//END COPYING HERE
+//********************BLACKBOX END******************