From 7a392947f716f2f91abfe7ec1f19e974a5eea98a Mon Sep 17 00:00:00 2001
From: Kang-min Liu <gugod@gugod.org>
Date: Wed, 23 Sep 2020 09:29:06 +0900
Subject: gugod's solution for challange 79.

---
 challenge-079/gugod/raku/ch-1.raku | 26 ++++++++++++++++++++++++++
 challenge-079/gugod/raku/ch-2.raku | 27 +++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 challenge-079/gugod/raku/ch-1.raku
 create mode 100644 challenge-079/gugod/raku/ch-2.raku

diff --git a/challenge-079/gugod/raku/ch-1.raku b/challenge-079/gugod/raku/ch-1.raku
new file mode 100644
index 0000000000..bba3e75515
--- /dev/null
+++ b/challenge-079/gugod/raku/ch-1.raku
@@ -0,0 +1,26 @@
+#!/usr/bin/env raku
+
+# https://perlweeklychallenge.org/blog/perl-weekly-challenge-079/
+# TASK #1 › Count Set Bits
+#
+#     raku ./ch-1.raku 4
+#     5 % 1000000007 = 5
+#
+
+sub count_set_bits(Int $n is copy) {
+    my Int $c = 0;
+    while $n > 0 {
+        $c += ($n % 2);
+        $n div= 2;
+    }
+    return $c;
+}
+
+sub MAIN(Int $N) {
+    my $total = 0;
+    for 1..$N -> $n {
+        my $c = count_set_bits($n);
+        $total += $c;
+    }
+    say "{{ $total }} % 1000000007 = " ~ ( $total % 1000000007 );
+}
diff --git a/challenge-079/gugod/raku/ch-2.raku b/challenge-079/gugod/raku/ch-2.raku
new file mode 100644
index 0000000000..be0f50fb14
--- /dev/null
+++ b/challenge-079/gugod/raku/ch-2.raku
@@ -0,0 +1,27 @@
+#!/usr/bin/env raku
+
+# https://perlweeklychallenge.org/blog/perl-weekly-challenge-079/
+# TASK #2 › Trapped Rain Water
+#
+#   # raku ./ch-2.raku 2,1,4,1,2,5
+#   6
+#   # raku ./ch-2.raku 3,1,3,1,1,5
+#   6
+
+sub trapped-rain-water (@N) {
+    my $water = 0;
+
+    my @left-wall  = (0..@N.end()).map(-> $i { @N[0..$i].max() });
+    my @right-wall = (0..@N.end()).map(-> $i { @N[$i..*].max() });
+
+    for 0..@N.end() -> $i {
+        $water += ( @left-wall[$i] - @N[$i], @right-wall[$i] - @N[$i] ).min();
+    }
+
+    return $water;
+}
+
+sub MAIN (Str $N) {
+    my @N = $N.split(',');
+    say trapped-rain-water(@N);
+}
-- 
cgit