Commit 377586e

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+You are given a list of numbers, and a target number k.
+Return whether or not there are two numbers in the list that add up to k.
+
+Example:
+Given [4, 7, 1 , -3, 2] and k = 5,
+return true since 4 + 1 = 5.
+
+def two_sum(list, k):
+  # Fill this in.
+
+print two_sum([4,7,1,-3,2], 5)
+# True
+
+Try to do it in a single pass of the list.