space katem

lib/max_subarray.rb

@@ -1,8 +1,25 @@
 
-# Time Complexity: ?
-# Space Complexity: ?
+# Time Complexity: ? o(n)
+# Space Complexity: ? o(n)?
 def max_sub_array(nums)
     return 0 if nums == nil
 
-    raise NotImplementedError, "Method not implemented yet!"
+   current_sum = nums.first
+   max_number = nums.first
+
+   #use the spread here to loop through
+   (1...nums.length).each do |i|
+    current_sum += nums[i]
+    #check if current sum is larger than max, then max is the current num
+    if current_sum > max_number
+        max_number = current_sum
+    end
+    #if current sum is less than zero, then current zum equals 0
+    if current_sum < 0
+        current_sum = 0
+    end
+end
+
+return max_number
+
 end

lib/newman_conway.rb

@@ -1,7 +1,24 @@
 
 
-# Time complexity: ?
-# Space Complexity: ?
+# Time complexity: ? o(n)
+# Space Complexity: ? o(n)
 def newman_conway(num)
-  raise NotImplementedError, "newman_conway isn't implemented"
-end
+  raise ArgumentError if num <= 0
+  return 1 if num == 1
+
+  newman = [0, 1, 1]
+  goal = "1 1"
+  i = 3
+
+  #P(n) = P(P(n - 1)) + P(n - P(n - 1)) 
+  #https://www.geeksforgeeks.org/newman-conway-sequence/
+  until i >= num + 1
+    current_newman = newman[newman[i - 1]] + newman[i - (newman[i - 1])]
+
+    newman << current_newman
+    goal += " #{current_newman}"
+    i += 1
+  end
+
+  return goal
+end