mre · engr-hasanuzzaman · Feb 19, 2020 · Feb 19, 2020
diff --git a/problems/queue/queue.rb b/problems/queue/queue.rb
@@ -0,0 +1,24 @@
+#!/usr/bin/env ruby
+
+class Queue
+    def initialize
+        @queue = []
+    end 
+
+    def add(val)
+        @queue << val
+    end
+
+    def remove
+        @queue.shift
+    end
+end
+
+q = Queue.new
+q.add(1)
+q.add(2)
+q.add(3)
+puts q.remove()
+puts q.remove()
+puts q.remove()
+puts q.remove()
diff --git a/problems/substrings/substrings.rb b/problems/substrings/substrings.rb
@@ -0,0 +1,15 @@
+#!/usr/bin/env ruby
+
+def sub_strings(str)
+  sub_strs = str.split('')
+
+  str.size.times do |i|
+    for j in (i+1...str.size)
+      sub_strs << str[i..j]
+    end
+  end
+
+  sub_strs
+end
+
+puts sub_strings('abc').inspect