This notebook was prepared by Donne Martin. Source and license info is on GitHub.

Challenge Notebook¶

Constraints¶

• Can we assume the inputs are valid?
• No, check for None
• Can we assume this fits memory?
• Yes

Test Cases¶

See the LeetCode problem page.

Algorithm¶

Refer to the Solution Notebook. If you are stuck and need a hint, the solution notebook's algorithm discussion might be a good place to start.

Code¶

In [ ]:
class Solution(object):

def sum_two(self, val):
# TODO: Implement me
pass


Unit Test¶

The following unit test is expected to fail until you solve the challenge.

In [ ]:
# %load test_sum_two.py
import unittest

class TestSumTwo(unittest.TestCase):

def test_sum_two(self):
solution = Solution()
self.assertRaises(TypeError, solution.sum_two, None)
self.assertEqual(solution.sum_two(5, 7), 12)
self.assertEqual(solution.sum_two(-5, -7), -12)
self.assertEqual(solution.sum_two(5, -7), -2)
print('Success: test_sum_two')

def main():
test = TestSumTwo()
test.test_sum_two()

if __name__ == '__main__':
main()


Solution Notebook¶

Review the Solution Notebook for a discussion on algorithms and code solutions.