Data commit

Task/Square-but-not-cube/C-sharp/square-but-not-cube.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using static System.Console;
+using static System.Linq.Enumerable;
+
+public static class SquareButNotCube
+{
+    public static void Main() {
+        var squares = from i in Integers() select i * i;
+        var cubes = from i in Integers() select i * i * i;
+
+        foreach (var x in Merge().Take(33)) {
+            WriteLine(x.isCube ? x.n + " (also cube)" : x.n + "");
+        }
+
+        IEnumerable<int> Integers() {
+            for (int i = 1; ;i++) yield return i;
+        }
+
+        IEnumerable<(int n, bool isCube)> Merge() {
+            using (var s = squares.GetEnumerator())
+            using (var c = cubes.GetEnumerator()) {
+                s.MoveNext();
+                c.MoveNext();
+                while (true) {
+                    if (s.Current < c.Current) {
+                        yield return (s.Current, false);
+                        s.MoveNext();
+                    } else if (s.Current == c.Current) {
+                        yield return (s.Current, true);
+                        s.MoveNext();
+                        c.MoveNext();
+                    } else {
+                        c.MoveNext();
+                    }
+                }
+            }
+        }
+
+    }
+}