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LeetCode-Solutions/Python/maximum-product-subarray.py at master · pythonpeixun/LeetCode-Solutions · GitHub
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LeetCode-Solutions
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Python
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maximum-product-subarray.py
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LeetCode-Solutions
/
Python
/
maximum-product-subarray.py
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# Time: O(n)
# Space: O(1)
class
Solution
(
object
):
# @param A, a list of integers
# @return an integer
def
maxProduct
(
self
,
A
):
global_max
,
local_max
,
local_min
=
float
(
"-inf"
),
1
,
1
for
x
in
A
:
local_max
,
local_min
=
max
(
x
,
local_max
*
x
,
local_min
*
x
),
min
(
x
,
local_max
*
x
,
local_min
*
x
)
global_max
=
max
(
global_max
,
local_max
)
return
global_max
class
Solution2
(
object
):
# @param A, a list of integers
# @return an integer
def
maxProduct
(
self
,
A
):
global_max
,
local_max
,
local_min
=
float
(
"-inf"
),
1
,
1
for
x
in
A
:
local_max
=
max
(
1
,
local_max
)
if
x
>
0
:
local_max
,
local_min
=
local_max
*
x
,
local_min
*
x
else
:
local_max
,
local_min
=
local_min
*
x
,
local_max
*
x
global_max
=
max
(
global_max
,
local_max
)
return
global_max
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