Sandy

Gemfile.lock

@@ -33,4 +33,4 @@ DEPENDENCIES
   rake
 
 BUNDLED WITH
-   1.17.2
+   2.2.21

lib/max_subarray.rb

@@ -1,8 +1,18 @@
 
-# Time Complexity: ?
-# Space Complexity: ?
+# Time Complexity: O(n)
+# Space Complexity: O(1)
 def max_sub_array(nums)
     return 0 if nums == nil
-
-    raise NotImplementedError, "Method not implemented yet!"
+
+    max_amount = nums[0]
+    current_amount = 0
+    nums.each do |num|
+        current_amount += num
+        if max_amount < current_amount
+            max_amount = current_amount
+        elsif  current_amount < 0
+            current_amount = 0
+        end
+    end
+    return max_amount
 end

lib/newman_conway.rb

@@ -1,7 +1,18 @@
+# Time complexity: O(n)
+# Space Complexity: O(n)
+def newman_conway(num)
+raise ArgumentError if num <= 0
+
+return '1' if num == 1
+return '1 1' if num == 2
+
+record = [0, 1, 1]
+i = 3
+while (i <= num) 
+    record[i] = record[record[i - 1]] + record[i - record[i - 1]]
+    i += 1
+  end
+  record[1..-1].join(' ')
+end
 
 
-# Time complexity: ?
-# Space Complexity: ?
-def newman_conway(num)
-  raise NotImplementedError, "newman_conway isn't implemented"
-end

test/max_sub_array_test.rb

@@ -1,6 +1,6 @@
 require_relative "test_helper"
 
-xdescribe "max subarray" do
+describe "max subarray" do
   it "will work for [-2,1,-3,4,-1,2,1,-5,4]" do
     # Arrange
     input = [-2,1,-3,4,-1,2,1,-5,4]

yarn.lock

@@ -0,0 +1,4 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+