Data commit

Task/Magnanimous-numbers/Swift/magnanimous-numbers.swift

@@ -0,0 +1,54 @@
+import Foundation
+
+func isPrime(_ n: Int) -> Bool {
+    if n < 2 {
+        return false
+    }
+    if n % 2 == 0 {
+        return n == 2
+    }
+    if n % 3 == 0 {
+        return n == 3
+    }
+    var p = 5
+    while p * p <= n {
+        if n % p == 0 {
+            return false
+        }
+        p += 2
+        if n % p == 0 {
+            return false
+        }
+        p += 4
+    }
+    return true
+}
+
+func isMagnanimous(_ n: Int) -> Bool {
+    var p = 10;
+    while n >= p {
+        if !isPrime(n % p + n / p) {
+            return false
+        }
+        p *= 10
+    }
+    return true
+}
+
+let m = (0...).lazy.filter{isMagnanimous($0)}.prefix(400);
+print("First 45 magnanimous numbers:");
+for (i, n) in m.prefix(45).enumerated() {
+    if i > 0 && i % 15 == 0 {
+        print()
+    }
+    print(String(format: "%3d", n), terminator: " ")
+}
+print("\n\n241st through 250th magnanimous numbers:");
+for n in m.dropFirst(240).prefix(10) {
+    print(n, terminator: " ")
+}
+print("\n\n391st through 400th magnanimous numbers:");
+for n in m.dropFirst(390) {
+    print(n, terminator: " ")
+}
+print()