[Init] Solved solutions

cs/217A.cs

@@ -0,0 +1,48 @@
+using System;
+
+namespace _217A
+{
+	class Program
+	{
+		static void Main(string[] args)
+		{
+			int n = int.Parse(Console.ReadLine());
+			int[] p = new int[n];
+			int[][] a = new int[n][];
+			int c = 0;
+			for (int i = 0; i < n; i++)
+			{
+				a[i] = Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
+				p[i] = i;
+			}
+			for (int i = 0; i < n - 1; i++)
+			{
+				for (int j = i + 1; j < n; j++)
+				{
+					if (a[i][0] == a[j][0] || a[i][1] == a[j][1])
+					{
+						int ti = p[i];
+						while (ti != p[ti])
+						{
+							ti = p[ti];
+						}
+						int tj = p[j];
+						while (tj != p[tj])
+						{
+							tj = p[tj];
+						}
+						p[tj] = ti;
+					}
+				}
+			}
+			for (int i = 0; i < n; i++)
+			{
+				if (i == p[i])
+				{
+					c++;
+				}
+			}
+			Console.WriteLine(c - 1);
+		}
+	}
+}