gugod's solution for challange 79.

2 files changed, 53 insertions, 0 deletions

diff --git a/challenge-079/gugod/raku/ch-1.raku b/challenge-079/gugod/raku/ch-1.raku
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+++ b/challenge-079/gugod/raku/ch-1.raku
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+#!/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
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+++ b/challenge-079/gugod/raku/ch-2.raku
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+#!/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);
+}