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+#
+# from a hint at https://www.geeksforgeeks.org/find-a-pair-with-the-given-difference/
+#
+
+multi MAIN($A where * ~~ Int, *@N where .all ~~ Int) {
+    say pair-diff(+$A, @N.map(+*));
+}
+
+multi MAIN {
+    use Test;
+    plan 3;
+
+    ok  pair-diff(7,  [10, 8, 12, 15, 5]),   "Example 1";
+    ok  pair-diff(6,  [1, 5, 2, 9, 7]),      "Example 2";
+    nok pair-diff(15, [10, 30, 20, 50, 40]), "Example 3";
+}
+
+sub pair-diff($A, @N) {
+    my $b = bag @N;
+
+    if $A == 0 {
+        return +$b.values.first(* > 1).so;
+    }
+
+    for $b.keys -> $k {
+        return 1 if $b{$A+$k};
+    }
+
+    return 0;
+}