From 9f853b8d91a55bf0bbf35ad364169b62f2259101 Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Wed, 2 Oct 2019 14:32:32 +0530
Subject: [PATCH 01/16] Create kadane.py
---
allalgorithms/subarray/kadane.py | 14 ++++++++++++++
1 file changed, 14 insertions(+)
create mode 100644 allalgorithms/subarray/kadane.py
diff --git a/allalgorithms/subarray/kadane.py b/allalgorithms/subarray/kadane.py
new file mode 100644
index 0000000..36f3789
--- /dev/null
+++ b/allalgorithms/subarray/kadane.py
@@ -0,0 +1,14 @@
+# Algorithm for Kadane's max sum contigious subarray
+
+def maxsum_subarray(arr):
+ curr = arr[0]
+ maxx = arr[0]
+ n = len(arr)
+
+ for i in range(1,n):
+ curr = max(arr[i],curr+arr[i])
+ maxx = max(curr,maxx)
+
+ return maxx
+
+
From a8cf0a2ca46b5c00e4065888fb7e26a7b23457f2 Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Wed, 2 Oct 2019 14:41:10 +0530
Subject: [PATCH 02/16] Update kadane.py
---
allalgorithms/subarray/kadane.py | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/allalgorithms/subarray/kadane.py b/allalgorithms/subarray/kadane.py
index 36f3789..a878b84 100644
--- a/allalgorithms/subarray/kadane.py
+++ b/allalgorithms/subarray/kadane.py
@@ -1,4 +1,14 @@
# Algorithm for Kadane's max sum contigious subarray
+# -*- coding: UTF-8 -*-
+#
+# Merge Sort Algorithm
+# The All ▲lgorithms library for python
+#
+# Contributed by: Kunal Keshav Singh Sahni
+# Github: @kunal768
+#
+
+import sys
def maxsum_subarray(arr):
curr = arr[0]
@@ -12,3 +22,24 @@ def maxsum_subarray(arr):
return maxx
+def returnArray(arr):
+ size = len(arr)
+ max_so_far = -sys.maxsize - 1
+ max_ending_here = 0
+ start = 0
+ end = 0
+ s = 0
+ for i in range(0,size):
+
+ max_ending_here += arr[i]
+
+ if max_so_far < max_ending_here:
+ max_so_far = max_ending_here
+ start = s
+ end = i
+
+ if max_ending_here < 0:
+ max_ending_here = 0
+ s = i+1
+
+ return [max_so_far,arr[start:end+1]]
From 0b7cbcfcf2edb6062275cb3a69c35e7cbf793c1c Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Wed, 2 Oct 2019 14:49:31 +0530
Subject: [PATCH 03/16] added test cases
---
tests/test_kadane.py | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
create mode 100644 tests/test_kadane.py
diff --git a/tests/test_kadane.py b/tests/test_kadane.py
new file mode 100644
index 0000000..14ee4b4
--- /dev/null
+++ b/tests/test_kadane.py
@@ -0,0 +1,20 @@
+import unittest
+
+from allalgorithms.subarray import kadane
+
+class TestSearches(unittest.TestCase):
+
+ def test_returnArray(self):
+ self.assertEqual( [11,[2,3,-1,7]], binary_search([2,3,-1,7]))
+ self.assertEqual([5,[2,3]], binary_search([2,3,-2,4]))
+ self.assertEqual([0, [0]], binary_search([-1,-1,-0,0]))
+ self.assertEqual([-1, [-1]], binary_search([-1]))
+
+ def test_maxsum_subarray(self):
+ self.assertEqual( 11,, binary_search([2,3,-1,7]))
+ self.assertEqual(5, binary_search([2,3,-2,4]))
+ self.assertEqual(0, binary_search([-1,-1,-0,0]))
+ self.assertEqual(-1, binary_search([-1]))
+
+if __name__ == '__main__':
+ unittest.main()
From 5f09974e74f1139fe57f96e94b0afdc5a69d471d Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Wed, 2 Oct 2019 14:58:42 +0530
Subject: [PATCH 04/16] Create kadane.md
---
docs/subarray/kadane.md | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
create mode 100644 docs/subarray/kadane.md
diff --git a/docs/subarray/kadane.md b/docs/subarray/kadane.md
new file mode 100644
index 0000000..ef387b6
--- /dev/null
+++ b/docs/subarray/kadane.md
@@ -0,0 +1,36 @@
+# Kadane's Algorithm
+
+Kadane’s algorithm is to look for all positive contiguous segments of the array (max_ending_here is used for this). And keep track of maximum sum contiguous segment among all positive segments (max_so_far is used for this) Each time we get a positive sum compare it with max_so_far and update max_so_far if it is greater than max_so_far
+## Install
+
+```
+pip install allalgorithms
+```
+
+## Usage
+
+```py
+from allalgorithms.subarray import kadane
+
+arr = [-2, 1, 2, 7, 10, 77]
+
+print(kadane.maxsum_subarray(arr))
+# -> 97
+
+print(kadane.returnArray(arr))
+# -> [97, [1, 2, 7, 10, 77]]
+```
+
+## API
+
+### maxsum_subarray(array)
+
+> Return sum of maximum contigious subarray
+
+### returnArray(array)
+
+> Return sum along with the respective subarray
+
+##### Params:
+
+- `array`: Array (may contain negative elements)
From 2f43454a189bb0c1848737102b340af40290b976 Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Wed, 2 Oct 2019 15:00:11 +0530
Subject: [PATCH 05/16] Update readme.md
---
readme.md | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/readme.md b/readme.md
index 9929e55..89b7c6a 100644
--- a/readme.md
+++ b/readme.md
@@ -69,10 +69,15 @@ print(binary_search(arr, 3))
- [Merge Sort](https://python.allalgorithms.com/sorting/merge-sort)
- [Pigeonhole Sort](https://python.allalgorithms.com/sorting/pigeonhole-sort)
- [Selection Sort](https://python.allalgorithms.com/sorting/selection-sort)
- - [Stooge Sort](https://python.allalgorithms.com/sorting/stooge-sort)
+ - [Stooge Sort](https://python.allalgorithms.com/sorting/stooge-sor
+
- ### String
- [Palindrome Check](https://python.allalgorithms.com/string/palindrom-check)
+- ### Subarray
+ - [Kadane's Algorithm](https://python.allalgorithms.com/subarray/kadane)
+
+
# Related
- [allalgorithms-javascript](https://github.com/abranhe/allalgorithms-javascript): All ▲lgorithms Javascript library
From 27de68e6da0deaf91c0e14b8500379b4de793c15 Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Wed, 2 Oct 2019 15:01:26 +0530
Subject: [PATCH 06/16] Update readme.md
---
readme.md | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/readme.md b/readme.md
index 89b7c6a..71c5d38 100644
--- a/readme.md
+++ b/readme.md
@@ -75,7 +75,7 @@ print(binary_search(arr, 3))
- [Palindrome Check](https://python.allalgorithms.com/string/palindrom-check)
- ### Subarray
- - [Kadane's Algorithm](https://python.allalgorithms.com/subarray/kadane)
+ - [Kadane's Algorithm](https://github.com/kunal768/allalgorithms-python/blob/master/allalgorithms/subarray/kadane.py)
# Related
From 58d5b5b0d6a40802399298ad4d4fd4bbac1ad452 Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Wed, 2 Oct 2019 19:51:50 +0530
Subject: [PATCH 07/16] Update readme.md
---
docs/readme.md | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/docs/readme.md b/docs/readme.md
index 9929e55..71c5d38 100644
--- a/docs/readme.md
+++ b/docs/readme.md
@@ -69,10 +69,15 @@ print(binary_search(arr, 3))
- [Merge Sort](https://python.allalgorithms.com/sorting/merge-sort)
- [Pigeonhole Sort](https://python.allalgorithms.com/sorting/pigeonhole-sort)
- [Selection Sort](https://python.allalgorithms.com/sorting/selection-sort)
- - [Stooge Sort](https://python.allalgorithms.com/sorting/stooge-sort)
+ - [Stooge Sort](https://python.allalgorithms.com/sorting/stooge-sor
+
- ### String
- [Palindrome Check](https://python.allalgorithms.com/string/palindrom-check)
+- ### Subarray
+ - [Kadane's Algorithm](https://github.com/kunal768/allalgorithms-python/blob/master/allalgorithms/subarray/kadane.py)
+
+
# Related
- [allalgorithms-javascript](https://github.com/abranhe/allalgorithms-javascript): All ▲lgorithms Javascript library
From 5731fd81717611fbe6718b2affcb9381a8283cfd Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Wed, 2 Oct 2019 19:55:17 +0530
Subject: [PATCH 08/16] Update readme.md
---
readme.md | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/readme.md b/readme.md
index 71c5d38..777609b 100644
--- a/readme.md
+++ b/readme.md
@@ -69,7 +69,7 @@ print(binary_search(arr, 3))
- [Merge Sort](https://python.allalgorithms.com/sorting/merge-sort)
- [Pigeonhole Sort](https://python.allalgorithms.com/sorting/pigeonhole-sort)
- [Selection Sort](https://python.allalgorithms.com/sorting/selection-sort)
- - [Stooge Sort](https://python.allalgorithms.com/sorting/stooge-sor
+ - [Stooge Sort](https://python.allalgorithms.com/sorting/stooge-sort)
- ### String
- [Palindrome Check](https://python.allalgorithms.com/string/palindrom-check)
From cb28675a2293854609d78273ff0c54a12e18f649 Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Wed, 2 Oct 2019 20:27:42 +0530
Subject: [PATCH 09/16] Update kadane.py
---
allalgorithms/subarray/kadane.py | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/allalgorithms/subarray/kadane.py b/allalgorithms/subarray/kadane.py
index a878b84..c4202f9 100644
--- a/allalgorithms/subarray/kadane.py
+++ b/allalgorithms/subarray/kadane.py
@@ -1,7 +1,6 @@
-# Algorithm for Kadane's max sum contigious subarray
# -*- coding: UTF-8 -*-
#
-# Merge Sort Algorithm
+# Kadane's Algorithm
# The All ▲lgorithms library for python
#
# Contributed by: Kunal Keshav Singh Sahni
From 57d56553915ff8a6ffabfbaf50c7e214e3c89b77 Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Thu, 3 Oct 2019 21:48:06 +0530
Subject: [PATCH 10/16] Update readme.md
---
readme.md | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/readme.md b/readme.md
index 777609b..c9429b0 100644
--- a/readme.md
+++ b/readme.md
@@ -75,7 +75,7 @@ print(binary_search(arr, 3))
- [Palindrome Check](https://python.allalgorithms.com/string/palindrom-check)
- ### Subarray
- - [Kadane's Algorithm](https://github.com/kunal768/allalgorithms-python/blob/master/allalgorithms/subarray/kadane.py)
+ - [Kadane's Algorithm](https://python.allalgorithms.com/subarray/kadane)
# Related
From d1550b52673c66bc913e146d7dd30b3e4ae63b67 Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Thu, 3 Oct 2019 21:50:53 +0530
Subject: [PATCH 11/16] Create __init__.py
---
allalgorithms/subarray/__init__.py | 1 +
1 file changed, 1 insertion(+)
create mode 100644 allalgorithms/subarray/__init__.py
diff --git a/allalgorithms/subarray/__init__.py b/allalgorithms/subarray/__init__.py
new file mode 100644
index 0000000..393ff54
--- /dev/null
+++ b/allalgorithms/subarray/__init__.py
@@ -0,0 +1 @@
+from .kadane import *
From 32730bec3c3bff1219c6d2f3089e263c2a058aaf Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Thu, 3 Oct 2019 21:56:22 +0530
Subject: [PATCH 12/16] Update test_kadane.py
---
tests/test_kadane.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tests/test_kadane.py b/tests/test_kadane.py
index 14ee4b4..88f06d1 100644
--- a/tests/test_kadane.py
+++ b/tests/test_kadane.py
@@ -11,7 +11,7 @@ def test_returnArray(self):
self.assertEqual([-1, [-1]], binary_search([-1]))
def test_maxsum_subarray(self):
- self.assertEqual( 11,, binary_search([2,3,-1,7]))
+ self.assertEqual(11,binary_search([2,3,-1,7]))
self.assertEqual(5, binary_search([2,3,-2,4]))
self.assertEqual(0, binary_search([-1,-1,-0,0]))
self.assertEqual(-1, binary_search([-1]))
From b7f3c53b8d5116af2e5f8f96fd460cf3187a9bcf Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Thu, 3 Oct 2019 22:00:42 +0530
Subject: [PATCH 13/16] Update test_kadane.py
---
tests/test_kadane.py | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/tests/test_kadane.py b/tests/test_kadane.py
index 88f06d1..698481a 100644
--- a/tests/test_kadane.py
+++ b/tests/test_kadane.py
@@ -1,17 +1,16 @@
import unittest
-
from allalgorithms.subarray import kadane
class TestSearches(unittest.TestCase):
-
+
def test_returnArray(self):
self.assertEqual( [11,[2,3,-1,7]], binary_search([2,3,-1,7]))
self.assertEqual([5,[2,3]], binary_search([2,3,-2,4]))
self.assertEqual([0, [0]], binary_search([-1,-1,-0,0]))
self.assertEqual([-1, [-1]], binary_search([-1]))
-
+
def test_maxsum_subarray(self):
- self.assertEqual(11,binary_search([2,3,-1,7]))
+ self.assertEqual(11,binary_search([2,3,-1,7]))
self.assertEqual(5, binary_search([2,3,-2,4]))
self.assertEqual(0, binary_search([-1,-1,-0,0]))
self.assertEqual(-1, binary_search([-1]))
From 2e0467466347fd0add9eac58e54aa0da041001e0 Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Thu, 3 Oct 2019 22:03:50 +0530
Subject: [PATCH 14/16] Update test_kadane.py
---
tests/test_kadane.py | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/tests/test_kadane.py b/tests/test_kadane.py
index 698481a..22e1952 100644
--- a/tests/test_kadane.py
+++ b/tests/test_kadane.py
@@ -1,19 +1,19 @@
import unittest
+
from allalgorithms.subarray import kadane
class TestSearches(unittest.TestCase):
-
def test_returnArray(self):
- self.assertEqual( [11,[2,3,-1,7]], binary_search([2,3,-1,7]))
- self.assertEqual([5,[2,3]], binary_search([2,3,-2,4]))
- self.assertEqual([0, [0]], binary_search([-1,-1,-0,0]))
- self.assertEqual([-1, [-1]], binary_search([-1]))
-
+ self.assertEqual( [11,[2,3,-1,7]], returnArray([2,3,-1,7]))
+ self.assertEqual([5,[2,3]], returnArray([2,3,-2,4]))
+ self.assertEqual([0, [0]], returnArray([-1,-1,-0,0]))
+ self.assertEqual([-1, [-1]], returnArray([-1]))
+
def test_maxsum_subarray(self):
- self.assertEqual(11,binary_search([2,3,-1,7]))
- self.assertEqual(5, binary_search([2,3,-2,4]))
- self.assertEqual(0, binary_search([-1,-1,-0,0]))
- self.assertEqual(-1, binary_search([-1]))
+ self.assertEqual(11,maxsum_subarray([2,3,-1,7]))
+ self.assertEqual(5, maxsum_subarray([2,3,-2,4]))
+ self.assertEqual(0, maxsum_subarray([-1,-1,-0,0]))
+ self.assertEqual(-1, maxsum_subarray([-1]))
if __name__ == '__main__':
unittest.main()
From faae893c7f86bb427e1b6e0b7b65591c7cd5b6c2 Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Thu, 3 Oct 2019 22:07:44 +0530
Subject: [PATCH 15/16] Update test_kadane.py
---
tests/test_kadane.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tests/test_kadane.py b/tests/test_kadane.py
index 22e1952..1b92ab7 100644
--- a/tests/test_kadane.py
+++ b/tests/test_kadane.py
@@ -1,6 +1,6 @@
import unittest
-from allalgorithms.subarray import kadane
+from allalgorithms.kadane import *
class TestSearches(unittest.TestCase):
def test_returnArray(self):
From 73ab13e7ac7964057a79aea5a165d5f331bc7f5e Mon Sep 17 00:00:00 2001
From: kunal768 <33108756+kunal768@users.noreply.github.com>
Date: Thu, 3 Oct 2019 22:23:26 +0530
Subject: [PATCH 16/16] Update test_kadane.py
---
tests/test_kadane.py | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/tests/test_kadane.py b/tests/test_kadane.py
index 1b92ab7..63da946 100644
--- a/tests/test_kadane.py
+++ b/tests/test_kadane.py
@@ -1,19 +1,19 @@
import unittest
-from allalgorithms.kadane import *
+from allalgorithms.subarray import kadane
class TestSearches(unittest.TestCase):
def test_returnArray(self):
- self.assertEqual( [11,[2,3,-1,7]], returnArray([2,3,-1,7]))
- self.assertEqual([5,[2,3]], returnArray([2,3,-2,4]))
- self.assertEqual([0, [0]], returnArray([-1,-1,-0,0]))
- self.assertEqual([-1, [-1]], returnArray([-1]))
+ self.assertEqual( [11,[2,3,-1,7]], kadane.returnArray([2,3,-1,7]))
+ self.assertEqual([5,[2,3]], kadane.returnArray([2,3,-2,4]))
+ self.assertEqual([0, [0]], kadane.returnArray([-1,-1,-0,0]))
+ self.assertEqual([-1, [-1]], kadane.returnArray([-1]))
def test_maxsum_subarray(self):
- self.assertEqual(11,maxsum_subarray([2,3,-1,7]))
- self.assertEqual(5, maxsum_subarray([2,3,-2,4]))
- self.assertEqual(0, maxsum_subarray([-1,-1,-0,0]))
- self.assertEqual(-1, maxsum_subarray([-1]))
+ self.assertEqual(11,kadane.maxsum_subarray([2,3,-1,7]))
+ self.assertEqual(5, kadane.maxsum_subarray([2,3,-2,4]))
+ self.assertEqual(0, kadane.maxsum_subarray([-1,-1,-0,0]))
+ self.assertEqual(-1, kadane.maxsum_subarray([-1]))
if __name__ == '__main__':
unittest.main()
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