cs: add “547. Number of Provinces”

Signed-off-by: Matej Focko <mfocko@redhat.com>

cs/number-of-provinces.cs

@@ -0,0 +1,35 @@
+public class Solution {
+    private void BFS(int[][] graph, List<bool> visited, int u0) {
+        var q = new Queue<int>();
+        q.Enqueue(u0);
+        visited[u0] = true;
+
+        while (q.Count > 0) {
+            var u = q.Dequeue();
+            for (var v = 0; v < graph.Length; ++v) {
+                if (graph[u][v] == 0 || visited[v]) {
+                    continue;
+                }
+
+                q.Enqueue(v);
+                visited[v] = true;
+            }
+        }
+    }
+
+    public int FindCircleNum(int[][] isConnected) {
+        var visited = new List<bool>(Enumerable.Repeat(false, isConnected.Length));
+
+        var count = 0;
+        for (var i = 0; i < isConnected.Length; ++i) {
+            if (visited[i]) {
+                continue;
+            }
+
+            BFS(isConnected, visited, i);
+            ++count;
+        }
+
+        return count;
+    }
+}