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added a program on binary search (binary_search.py) #71

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added a program on binary search (binary_search.py) #71

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27 changes: 27 additions & 0 deletions binary_search.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
def binarySearch(arr, l, r, x):

while l <= r:

mid = l + (r - l)/2;

# Check if x is present at mid
if arr[mid] == x:
return mid

# If x is greater, ignore left half
elif arr[mid] < x:
l = mid + 1

# If x is smaller, ignore right half
else:
r = mid - 1
return -1
arr = [ 2, 3, 4, 10, 40 ]
x = 10

result = binarySearch(arr, 0, len(arr)-1, x)

if result != -1:
print "Element is present at index %d" % result
else:
print "Element is not present in array"