Merge pull request #10257 from spadacciniweb/PWC-273

PWC 273 - Add ch-1 and ch-2 in Python and Elixir, remake ch-2 in Perl

5 files changed, 236 insertions, 8 deletions

diff --git a/challenge-273/spadacciniweb/elixir/ch-1.exs b/challenge-273/spadacciniweb/elixir/ch-1.exs
new file mode 100644
index 0000000000..3fe074e791
--- /dev/null
+++ b/challenge-273/spadacciniweb/elixir/ch-1.exs
@@ -0,0 +1,65 @@
+# Task 1: Percentage of Character
+# Submitted by: Mohammad Sajid Anwar
+# 
+# You are given a string, $str and a character $char.
+# Write a script to return the percentage, nearest whole, of given character in the given string.
+# 
+# Example 1
+# Input: $str = "perl", $char = "e"
+# Output: 25
+# 
+# Example 2
+# Input: $str = "java", $char = "a"
+# Output: 50
+# 
+# Example 3
+# Input: $str = "python", $char = "m"
+# Output: 0
+# 
+# Example 4
+# Input: $str = "ada", $char = "a"
+# Output: 67
+# 
+# Example 5
+# Input: $str = "ballerina", $char = "l"
+# Output: 22
+# 
+# Example 6
+# Input: $str = "analitik", $char = "k"
+# Output: 13
+
+defmodule Percentage do
+
+  def freq(str, char) do
+    String.split(str, "", trim: true)
+    |> Enum.frequencies
+    |> Map.get(char)
+  end
+
+  def out(str, char) do
+    IO.write( str <> " " <> char <> " -> ")
+    case freq(str, char) do
+        nil -> IO.puts "0"
+        x -> IO.puts( x / String.length(str)*100 |> round )
+    end
+  end
+
+end
+
+str = "perl"; char = "e";
+Percentage.out(str, char)
+
+str = "java"; char = "a";
+Percentage.out(str, char)
+
+str = "python"; char = "m";
+Percentage.out(str, char)
+
+str = "ada"; char = "a";
+Percentage.out(str, char)
+
+str = "ballerina"; char = "l";
+Percentage.out(str, char)
+
+str = "analitik"; char = "k";
+Percentage.out(str, char)
diff --git a/challenge-273/spadacciniweb/elixir/ch-2.exs b/challenge-273/spadacciniweb/elixir/ch-2.exs
new file mode 100644
index 0000000000..ca07864984
--- /dev/null
+++ b/challenge-273/spadacciniweb/elixir/ch-2.exs
@@ -0,0 +1,60 @@
+# Task 2: B After A
+# Submitted by: Mohammad Sajid Anwar
+# 
+# You are given a string, $str.
+# Write a script to return true if there is at least one b, and no a appears after the first b.
+# 
+# Example 1
+# Input: $str = "aabb"
+# Output: true
+# 
+# Example 2
+# Input: $str = "abab"
+# Output: false
+# 
+# Example 3
+# Input: $str = "aaa"
+# Output: false
+# 
+# Example 4
+# Input: $str = "bbb"
+# Output: true
+
+defmodule Position do
+
+  def first_b(str) do
+    case Regex.run(~r/b/, str, return: :index) do
+      nil -> nil
+      out -> out |> Enum.fetch!(0) |> elem(0)
+    end
+  end
+
+  def last_a(str, pos) do
+    case Regex.run(~r/a/, str, offset: pos, return: :index) do
+      nil -> IO.puts( "true" )
+      _   -> IO.puts( "false" )
+    end 
+  end
+
+  def out(str) do
+    IO.write( str <> " -> " )
+    #IO.inspect( first_b(str) )
+    case first_b(str) do
+      nil -> IO.puts( "false" )
+      out -> last_a(str, out)
+    end
+  end
+
+end
+
+str = "aabb"
+Position.out(str)
+
+str = "abab"
+Position.out(str)
+
+str = "aaa"
+Position.out(str)
+
+str = "bbb"
+Position.out(str)
diff --git a/challenge-273/spadacciniweb/perl/ch-2.pl b/challenge-273/spadacciniweb/perl/ch-2.pl
index a7c968b0fd..9f7cc330ca 100644
--- a/challenge-273/spadacciniweb/perl/ch-2.pl
+++ b/challenge-273/spadacciniweb/perl/ch-2.pl
@@ -42,14 +42,10 @@ exit 0;
 sub position {
     my $str = shift;
 
-    my $first_b = index($str, 'b');
-    my $last_a = index((scalar reverse $str), 'a');
-    $last_a = length($str) - $last_a - 1
-        if $last_a >= 0;
-
+    my $offset = index($str, 'b');
     printf "%s -> %s\n",
         $str,
-        ($last_a > $first_b)
-            ? 'false'
-            : 'true';
+        ($offset >= 0 and index($str, 'a', $offset) == -1)
+            ? 'true'
+            : 'false';
 }
diff --git a/challenge-273/spadacciniweb/python/ch-1.py b/challenge-273/spadacciniweb/python/ch-1.py
new file mode 100644
index 0000000000..bfbc5cbc57
--- /dev/null
+++ b/challenge-273/spadacciniweb/python/ch-1.py
@@ -0,0 +1,61 @@
+# Task 1: Percentage of Character
+# Submitted by: Mohammad Sajid Anwar
+# 
+# You are given a string, $str and a character $char.
+# Write a script to return the percentage, nearest whole, of given character in the given string.
+# 
+# Example 1
+# Input: $str = "perl", $char = "e"
+# Output: 25
+# 
+# Example 2
+# Input: $str = "java", $char = "a"
+# Output: 50
+# 
+# Example 3
+# Input: $str = "python", $char = "m"
+# Output: 0
+# 
+# Example 4
+# Input: $str = "ada", $char = "a"
+# Output: 67
+# 
+# Example 5
+# Input: $str = "ballerina", $char = "l"
+# Output: 22
+# 
+# Example 6
+# Input: $str = "analitik", $char = "k"
+# Output: 13
+
+def percentage(str, char):
+    print("%s -> %d" % 
+             ( str, 
+               round( str.count(char)*100/len(str) )
+             )
+    )
+
+if __name__ == "__main__":
+    str = "perl"
+    char = "e"
+    percentage(str, char)
+
+    str = "java"
+    char = "a"
+    percentage(str, char)
+
+    str = "python"
+    char = "m"
+    percentage(str, char)
+
+    str = "ada"
+    char = "a"
+    percentage(str, char)
+
+    str = "ballerina"
+    char = "l"
+    percentage(str, char)
+
+    str = "analitik"
+    char = "k"
+    percentage(str, char)
diff --git a/challenge-273/spadacciniweb/python/ch-2.py b/challenge-273/spadacciniweb/python/ch-2.py
new file mode 100644
index 0000000000..dce0bca454
--- /dev/null
+++ b/challenge-273/spadacciniweb/python/ch-2.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env perl
+
+# Task 2: B After A
+# Submitted by: Mohammad Sajid Anwar
+# 
+# You are given a string, $str.
+# Write a script to return true if there is at least one b, and no a appears after the first b.
+# 
+# Example 1
+# Input: $str = "aabb"
+# Output: true
+# 
+# Example 2
+# Input: $str = "abab"
+# Output: false
+# 
+# Example 3
+# Input: $str = "aaa"
+# Output: false
+# 
+# Example 4
+# Input: $str = "bbb"
+# Output: true
+
+def out(str):
+    offset = str.find('b')
+    if offset >= 0 and str.find('a', offset) == -1:
+        res = "true"
+    else:
+        res = "false"
+    print("%s -> %s" % 
+             ( str, res )
+    )
+
+if __name__ == "__main__":
+    str = "aabb"
+    out(str)
+
+    str = "abab"
+    out(str)
+
+    str = "aaa"
+    out(str)
+
+    str = "bbb"
+    out(str)