Added sum of three for GA2 and cleanup

GA2/sum_of_three.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+
+import sys
+
+def search_two(A, sum2, i_skip):
+    i = 0
+    j = len(A) - 1
+
+    while i < j:
+        if i == i_skip:
+            i = i + 1
+        elif j == i_skip:
+            j = j - 1
+        else:
+            cs = A[i] + A[j]
+            if cs == sum2:
+                return True
+            elif cs > sum2:
+                j = j - 1
+            else:
+                i = i + 1
+
+    return False
+
+def sum_of_three(A, sum3):
+    A.sort() # assume using mergesort for worst case of O(n*log(n))
+    l = len(A)
+
+    for i in range(l):
+        if search_two(A, sum3 - A[i], i):
+            return True
+
+    return False
+
+if __name__ == "__main__":
+    args = [int(x) for x in sys.argv[1:]]
+    print(sum_of_three(args[1:], args[0]))
+