Data commit

Task/Mian-Chowla-sequence/C-sharp/mian-chowla-sequence.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+
+static class Program {
+    static int[] MianChowla(int n) {
+        int[] mc = new int[n - 1 + 1];
+        HashSet<int> sums = new HashSet<int>(), ts = new HashSet<int>();
+        int sum; mc[0] = 1; sums.Add(2);
+        for (int i = 1; i <= n - 1; i++) {
+            for (int j = mc[i - 1] + 1; ; j++) {
+                mc[i] = j;
+                for (int k = 0; k <= i; k++) {
+                    sum = mc[k] + j;
+                    if (sums.Contains(sum)) { ts.Clear(); break; }
+                    ts.Add(sum);
+                }
+                if (ts.Count > 0) { sums.UnionWith(ts); break; }
+            }
+        }
+        return mc;
+    }
+
+    static void Main(string[] args)
+    {
+        const int n = 100; Stopwatch sw = new Stopwatch();
+        string str = " of the Mian-Chowla sequence are:\n";
+        sw.Start(); int[] mc = MianChowla(n); sw.Stop();
+        Console.Write("The first 30 terms{1}{2}{0}{0}Terms 91 to 100{1}{3}{0}{0}" +
+            "Computation time was {4}ms.{0}", '\n', str, string.Join(" ", mc.Take(30)),
+            string.Join(" ", mc.Skip(n - 10)), sw.ElapsedMilliseconds);
+    }
+}