From 41994ccfdc6245a1586bd3b00a6c053c15707e8f Mon Sep 17 00:00:00 2001
From: Luca Ferrari <fluca1978@gmail.com>
Date: Mon, 29 Jun 2020 10:04:00 +0200
Subject: Task 1 done.

---
 challenge-067/luca-ferrari/raku/ch-1.p6 | 50 +++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 challenge-067/luca-ferrari/raku/ch-1.p6

diff --git a/challenge-067/luca-ferrari/raku/ch-1.p6 b/challenge-067/luca-ferrari/raku/ch-1.p6
new file mode 100644
index 0000000000..ae742e4567
--- /dev/null
+++ b/challenge-067/luca-ferrari/raku/ch-1.p6
@@ -0,0 +1,50 @@
+#!raku
+
+# Task 1
+# You are given two integers $m and $n. Write a script print all possible combinations of $n numbers from the list 1 2 3 … $m.
+#
+# Every combination should be sorted i.e. [2,3] is valid combination but [3,2] is not.
+
+
+sub MAIN( Int :$m where { $m > 2 }  = 5,
+          Int :$n where { $n < $m } = 2 ) {
+
+    # available digits
+    my @digits = 1 .. $m;
+    # found combinations
+    my @combinations;
+
+    for @digits -> $start {
+
+        # build the array of combinations starting with the
+        # current digits, place another one that is increased by one
+        # so to keep sorting...
+        my @combination = $start;
+        @combination.push: $start + 1;
+
+
+        # ... and all an element until I've made the array
+        while ( @combination.elems < $n ) {
+            @combination.push( @combination[ *-1 ] + 1 );
+        }
+
+
+        # the last element of the array must be the value
+        # I've got as parameter, otherwise iterate
+        while ( @combination[ *-1 ] < $m ) {
+            # clone the array because I'm going to change it!
+            @combinations.push: Array.new( @combination );
+
+
+            # increase by one every element, so it will be kept in
+            # order
+            for 1 ..^ @combination.elems {
+                @combination[ $_ ] += 1;
+            }
+        }
+
+        @combinations.push: @combination if ( @combination[ *-1 ] == $m );
+    }
+
+    @combinations.join( ", " ).say;
+}
-- 
cgit