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image-overlap.py
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image-overlap.py
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import unittest
class Solution:
def largestOverlap(self, A, B):
max_overlap = 0
for row_offset in range(- len(A) + 1, len(A)):
for col_offset in range(- len(A) + 1, len(A)):
overlap = 0
for A_row in range(
max(0, row_offset),
min(len(A), len(A) + row_offset)
):
for A_col in range(
max(0, col_offset),
min(len(A), len(A) + col_offset)
):
if A[A_row][A_col] and \
B[A_row - row_offset][A_col - col_offset]:
overlap += 1
max_overlap = max(overlap, max_overlap)
return max_overlap
class TestSolution(unittest.TestCase):
def setUp(self):
self.sol = Solution()
def test_empty(self):
self.assertEqual(self.sol.largestOverlap([], []), 0)
def test_one1(self):
self.assertEqual(self.sol.largestOverlap([[0]], [[0]]), 0)
def test_one2(self):
self.assertEqual(self.sol.largestOverlap([[1]], [[0]]), 0)
def test_one3(self):
self.assertEqual(self.sol.largestOverlap([[1]], [[1]]), 1)
def test_four(self):
self.assertEqual(self.sol.largestOverlap([[0,1], [0, 0]], [[1,0], [0, 0]]), 1)
def test_custom1(self):
self.assertEqual(
self.sol.largestOverlap(
[[1,1,0],
[0,1,0],
[0,1,0]],
[[0,0,0],
[0,1,1],
[0,0,1]],
),
3,
)
if __name__ == "__main__":
unittest.main()