From 320c6addf371830f87c194e7cb8c8300f1f75865 Mon Sep 17 00:00:00 2001
From: Jan Krňávek <Jan.Krnavek@gmail.com>
Date: Sun, 19 Oct 2025 11:09:06 +0200
Subject: solutions week 342

---
 challenge-342/wambash/raku/ch-1.raku | 25 +++++++++++++++++++++++++
 challenge-342/wambash/raku/ch-2.raku | 22 ++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 challenge-342/wambash/raku/ch-1.raku
 create mode 100644 challenge-342/wambash/raku/ch-2.raku

diff --git a/challenge-342/wambash/raku/ch-1.raku b/challenge-342/wambash/raku/ch-1.raku
new file mode 100644
index 0000000000..4816ceea86
--- /dev/null
+++ b/challenge-342/wambash/raku/ch-1.raku
@@ -0,0 +1,25 @@
+#!/usr/bin/env raku
+
+sub balance-string (+$str) {
+    $str
+    andthen .match: / [$<digit>=\d|$<letter>=<:L>]+ /;
+
+    do with ( $<digit> - $<letter> ) {
+        when 0|1 { roundrobin $<digit>.sort, $<letter>.sort, :slip }
+        when -1  { roundrobin $<letter>.sort, $<digit>.sort, :slip }
+        default  { '' }
+    } andthen [~] $_ 
+}
+multi MAIN (Bool :test($)!) {
+    use Test;
+    is balance-string('a0b1c2'), '0a1b2c', 'letters and digits interleaved: a0b1c2 → 0a1b2c';
+    is balance-string('abc12'), 'a1b2c', 'letters first then digits: abc12 → a1b2c';
+    is balance-string('0a2b1c3'), '0a1b2c3', 'digits and letters shuffled: 0a2b1c3 → 0a1b2c3';
+    is balance-string('1a23'), '', 'unbalanced input 1a23 cannot form alternating string';
+    is balance-string('ab123'), '1a2b3', 'more digits than letters: ab123 → 1a2b3';
+    done-testing;
+}
+
+multi MAIN (+$str) {
+    say balance-string $str;
+}
diff --git a/challenge-342/wambash/raku/ch-2.raku b/challenge-342/wambash/raku/ch-2.raku
new file mode 100644
index 0000000000..d1d7396718
--- /dev/null
+++ b/challenge-342/wambash/raku/ch-2.raku
@@ -0,0 +1,22 @@
+#!/usr/bin/env raku
+
+sub max-score (+$str) {
+    $str
+    andthen .match: /^ [(0)|1]+ [(1)|0]+ $/, :ex 
+    andthen .map: { .[0] + .[1] }\                                                  
+    andthen .max
+}
+
+multi MAIN (Bool :test($)!) {
+    use Test;
+    is max-score('0011'), 4, 'split 0011 as 00|11 gives 2 zeros + 2 ones = 4';
+    is max-score('0000'), 3, 'all zeros: best split 000|0 gives 3 zeros + 0 ones = 3';
+    is max-score('1111'), 3, 'all ones: best split 1|111 gives 0 zeros + 3 ones = 3';
+    is max-score('0101'), 3, 'alternating bits: split 0|101 gives 1 zero + 2 ones = 3';
+    is max-score('011101'), 5, 'mixed pattern: split 0|11101 gives 1 zero + 4 ones = 5';
+    done-testing;
+}
+
+multi MAIN (+$str) {
+    say max-score $str;
+}
-- 
cgit