max_sub_array.py: Add Maximum Subarray algorithm

The math module has been removed

closes NITSkmOS#215

maximum_subarray/max_sub_array.py

@@ -7,8 +7,6 @@
 https://en.wikipedia.org/wiki/Maximum_subarray_problem
 """
 
-import math  # for using the infinity value we have imported math module
-
 
 # @param A is array
 # @param low is lowest index
@@ -44,7 +42,7 @@ def max_sub_array(A, low, high):
 def cross_sub_array(A, low, mid, high):
     # @param lsum is left sum
 
-    lsum = -math.inf
+    lsum = -10000
     sum = 0
     maxl = mid
     maxr = mid + 1
@@ -55,7 +53,7 @@ def cross_sub_array(A, low, mid, high):
             maxl = i
 
     # @param rsum is right sum
-    rsum = -math.inf
+    rsum = -10000
     sum = 0
     for i in range(mid + 1, high + 1):
         sum = sum + A[i]