From aecf51b43cf11e2d592fdfa86282d642e716d9a8 Mon Sep 17 00:00:00 2001
From: deadmarshal <adeadmarshal@gmail.com>
Date: Thu, 15 Dec 2022 10:13:05 +0330
Subject: TWC195

---
 challenge-195/deadmarshal/d/ch1.d | 27 +++++++++++++++++++++++++++
 challenge-195/deadmarshal/d/ch2.d | 24 ++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 challenge-195/deadmarshal/d/ch1.d
 create mode 100644 challenge-195/deadmarshal/d/ch2.d

(limited to 'challenge-195/deadmarshal/d')

diff --git a/challenge-195/deadmarshal/d/ch1.d b/challenge-195/deadmarshal/d/ch1.d
new file mode 100644
index 0000000000..b1c6252960
--- /dev/null
+++ b/challenge-195/deadmarshal/d/ch1.d
@@ -0,0 +1,27 @@
+import std.stdio:writeln;
+
+bool has_dups(int n)
+{
+  int[int] hash;
+  while(n)
+  {
+    if(hash.require(n%10,0)) return true;
+    hash[n%10] = 1;
+    n /= 10;
+  }
+  return false;
+}
+
+int special_integers(int n)
+{
+  int count = 0;
+  for(int i = 1; i <= n; ++i) if(!has_dups(i)) count++;
+  return count;
+}
+
+void main()
+{
+  writeln(special_integers(15));
+  writeln(special_integers(35));
+}
+
diff --git a/challenge-195/deadmarshal/d/ch2.d b/challenge-195/deadmarshal/d/ch2.d
new file mode 100644
index 0000000000..b80f690abc
--- /dev/null
+++ b/challenge-195/deadmarshal/d/ch2.d
@@ -0,0 +1,24 @@
+import std.stdio:writeln;
+import std.algorithm:all,filter,reduce,uniq,minElement,sort;
+import std.array:array;
+
+int most_frequent_even(int[] arr)
+{
+  if(all!"a & 1"(arr)) return -1;
+  int[int] hash;
+  foreach(int i; filter!(a => !(a & 1))(arr)) if(!(i & 1)) hash[i]++;
+  if(hash.values.length == hash.values.uniq.array.length)
+    return hash.keys.minElement;
+  return reduce!((a,b) => hash[a] == hash[b] ? a : b)(hash.keys.sort);
+}
+
+void main()
+{
+  int[] a1 = [1,1,2,6,2];
+  int[] a2 = [1,3,5,7];
+  int[] a3 = [6,4,4,6,1];
+  writeln(most_frequent_even(a1));
+  writeln(most_frequent_even(a2));
+  writeln(most_frequent_even(a3));
+}
+
-- 
cgit