Add library and road algorithm

Author: V-KSSHAM\Administrator

LibraryAndRoad.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Diagnostics;
+
+class Solution
+{
+    static void Main(String[] args)
+    {
+        int q = Convert.ToInt32(Console.ReadLine());
+        for (int a0 = 0; a0 < q; a0++)
+        {
+            string[] tokens_n = Console.ReadLine().Split(' ');
+            long n = Convert.ToInt64(tokens_n[0]);
+            long m = Convert.ToInt64(tokens_n[1]);
+            long x = Convert.ToInt64(tokens_n[2]);
+            long y = Convert.ToInt64(tokens_n[3]);
+
+            var paths = new bool[n][];
+            for (int i = 0; i < n; i++)
+            {
+                paths[i] = new bool[n];
+            }
+
+            for (int a1 = 0; a1 < m; a1++)
+            {
+                string[] tokens_city_1 = Console.ReadLine().Split(' ');
+                int city_1 = Convert.ToInt32(tokens_city_1[0]);
+                int city_2 = Convert.ToInt32(tokens_city_1[1]);
+                paths[city_1 - 1][city_2 - 1] = true;
+                paths[city_2 - 1][city_1 - 1] = true;
+            }
+
+            if (x <= y)
+            {
+                Console.WriteLine(x * n);
+
+                continue;
+            }
+
+            var hasPathToLibrary = new bool[n];
+            long sum = 0;
+            for (int i = 0; i < n; i++)
+            {
+                if (!hasPathToLibrary[i])
+                {
+                    // build library 
+                    hasPathToLibrary[i] = true;
+                    sum = sum + x;
+                    for (int j = 0; j < n; j++)
+                    {
+                        if (paths[i][j])
+                        {
+                            // build the road
+                            hasPathToLibrary[j] = true;
+                            sum += y;
+                        }
+                    }
+                }
+            }
+            
+            Console.WriteLine(sum);
+        }
+
+        Console.ReadKey();
+    }
+}