- Added guest contributions by Robert DiCicco.

2 files changed, 97 insertions, 0 deletions

diff --git a/challenge-172/robert-dicicco/ruby/ch-1.rb b/challenge-172/robert-dicicco/ruby/ch-1.rb
new file mode 100644
index 0000000000..f27fbc502b
--- /dev/null
+++ b/challenge-172/robert-dicicco/ruby/ch-1.rb
@@ -0,0 +1,50 @@
+#!ruby.exe
+
+# AUTHOR: Robert DiCicco
+# DATE: 2022-07-05
+# Challenge 172 Prime Partition ( Ruby )
+
+require 'prime'
+
+arr = []                        # array to hold primes
+result = []                     # array to hold results
+
+m = ARGV[0].to_i                # number to test
+
+n = ARGV[1].to_i                # how many primes to sum
+
+(1..m).each { |p|               # get primes <= number to test
+
+  if(Prime.prime?(p))
+
+    arr.push(p)                 # save it to arr
+
+  end
+
+}
+
+perm = arr.permutation(n).to_a    # get permutations of length n from arr
+
+perm.each { |subperm|             # get sum of each perm
+
+  sum = 0
+
+  (0..n).each { |ndx|
+
+    sum += subperm[ndx].to_i
+
+  }
+
+  if(sum == m)                    # if sum equals number to test
+
+    result.push(subperm.sort)     # save sorted perm to result
+
+  end
+
+}
+
+print("$m = #{m} $n = #{n}\n")
+
+print(result.uniq)                # remove all dup perms
+
+puts(" ")
diff --git a/challenge-172/robert-dicicco/ruby/ch-2.rb b/challenge-172/robert-dicicco/ruby/ch-2.rb
new file mode 100644
index 0000000000..d936889090
--- /dev/null
+++ b/challenge-172/robert-dicicco/ruby/ch-2.rb
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+#!ruby.exe
+
+# AUTHOR: Robert DiCicco
+# DATE: 2022-07-05
+# Challenge 172 Five Numbers ( Ruby )
+
+# Got both of these routines off of StackOverflow
+
+# IDNRTW        ( I Do Not Reinvent The Wheel )
+
+def median(array)                            #Define your method accepting an array as an argument.
+
+      array = array.sort                     #sort the array from least to greatest
+
+      if array.length.odd?                   #is the length of the array odd?
+
+        array[(array.length - 1) / 2]        #find value at this index
+
+      else array.length.even?                #is the length of the array even?
+
+       (array[array.length/2] + array[array.length/2 - 1])/2.to_f
+
+                                             #average the values found at these two indexes and convert to float
+
+      end
+
+end
+
+def percentile(values, percentile)
+
+      values_sorted = values.sort
+
+      k = (percentile*(values_sorted.length-1)+1).floor - 1
+
+      f = (percentile*(values_sorted.length-1)+1).modulo(1)
+
+      return values_sorted[k] + (f * (values_sorted[k+1] - values_sorted[k]))
+
+end
+
+arr = [10,12,14,16,18,24]
+
+med = median(arr)
+
+print("#{arr}\n")
+
+print("Min = #{arr.min}  Q1 = #{percentile(arr,0.25)} Median = #{med}  Q3 = #{percentile(arr,0.75)}  Max = #{arr.max}\n")