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test_search.py
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from algorithms.search import (
binary_search, binary_search_recur,
ternary_search,
first_occurrence,
last_occurrence,
linear_search,
search_insert,
two_sum, two_sum1, two_sum2,
search_range,
find_min_rotate, find_min_rotate_recur,
search_rotate, search_rotate_recur,
jump_search,
next_greatest_letter, next_greatest_letter_v1, next_greatest_letter_v2,
interpolation_search
)
import unittest
class TestSuite(unittest.TestCase):
def test_first_occurrence(self):
def helper(array, query):
idx = array.index(query) if query in array else None
return idx
array = [1, 1, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 6, 6, 6]
self.assertEqual(first_occurrence(array, 1), helper(array, 1))
self.assertEqual(first_occurrence(array, 3), helper(array, 3))
self.assertEqual(first_occurrence(array, 5), helper(array, 5))
self.assertEqual(first_occurrence(array, 6), helper(array, 6))
self.assertEqual(first_occurrence(array, 7), helper(array, 7))
self.assertEqual(first_occurrence(array, -1), helper(array, -1))
def test_binary_search(self):
array = [1, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 6]
self.assertEqual(10, binary_search(array, 5))
self.assertEqual(11, binary_search(array, 6))
self.assertEqual(None, binary_search(array, 7))
self.assertEqual(None, binary_search(array, -1))
# Test binary_search_recur
self.assertEqual(10, binary_search_recur(array, 0, 11, 5))
self.assertEqual(11, binary_search_recur(array, 0, 11, 6))
self.assertEqual(-1, binary_search_recur(array, 0, 11, 7))
self.assertEqual(-1, binary_search_recur(array, 0, 11, -1))
def test_ternary_search(self):
array = [1, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 6]
self.assertEqual(10, ternary_search(0, 11, 5, array))
self.assertEqual(3, ternary_search(0, 10, 3, array))
self.assertEqual(-1, ternary_search(0, 10, 5, array))
self.assertEqual(-1, ternary_search(0, 11, 7, array))
self.assertEqual(-1, ternary_search(0, 11, -1, array))
def test_last_occurrence(self):
array = [1, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 6, 6, 6]
self.assertEqual(5, last_occurrence(array, 3))
self.assertEqual(10, last_occurrence(array, 5))
self.assertEqual(None, last_occurrence(array, 7))
self.assertEqual(0, last_occurrence(array, 1))
self.assertEqual(13, last_occurrence(array, 6))
def test_linear_search(self):
array = [1, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 6, 6, 6]
self.assertEqual(6, linear_search(array, 4))
self.assertEqual(10, linear_search(array, 5))
self.assertEqual(-1, linear_search(array, 7))
self.assertEqual(-1, linear_search(array, -1))
def test_search_insert(self):
array = [1, 3, 5, 6]
self.assertEqual(2, search_insert(array, 5))
self.assertEqual(1, search_insert(array, 2))
self.assertEqual(4, search_insert(array, 7))
self.assertEqual(0, search_insert(array, 0))
def test_two_sum(self):
array = [2, 7, 11, 15]
# test two_sum
self.assertEqual([1, 2], two_sum(array, 9))
self.assertEqual([2, 4], two_sum(array, 22))
# test two_sum1
self.assertEqual([1, 2], two_sum1(array, 9))
self.assertEqual([2, 4], two_sum1(array, 22))
# test two_sum2
self.assertEqual([1, 2], two_sum2(array, 9))
self.assertEqual([2, 4], two_sum2(array, 22))
def test_search_range(self):
array = [5, 7, 7, 8, 8, 8, 10]
self.assertEqual([3, 5], search_range(array, 8))
self.assertEqual([1, 2], search_range(array, 7))
self.assertEqual([-1, -1], search_range(array, 11))
array = [5, 7, 7, 7, 7, 8, 8, 8, 8, 10]
self.assertEqual([5, 8], search_range(array, 8))
self.assertEqual([1, 4], search_range(array, 7))
self.assertEqual([-1, -1], search_range(array, 11))
def test_find_min_rotate(self):
array = [4, 5, 6, 7, 0, 1, 2]
self.assertEqual(0, find_min_rotate(array))
array = [10, 20, -1, 0, 1, 2, 3, 4, 5]
self.assertEqual(-1, find_min_rotate(array))
# Test find min using recursion
array = [4, 5, 6, 7, 0, 1, 2]
self.assertEqual(0, find_min_rotate_recur(array, 0, 6))
array = [10, 20, -1, 0, 1, 2, 3, 4, 5]
self.assertEqual(-1, find_min_rotate_recur(array, 0, 8))
def test_search_rotate(self):
array = [15, 16, 19, 20, 25, 1, 3, 4, 5, 7, 10, 14]
self.assertEqual(8, search_rotate(array, 5))
self.assertEqual(-1, search_rotate(array, 9))
self.assertEqual(8, search_rotate_recur(array, 0, 11, 5))
self.assertEqual(-1, search_rotate_recur(array, 0, 11, 9))
def test_jump_search(self):
array = [1, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 6]
self.assertEqual(10, jump_search(array, 5))
self.assertEqual(2, jump_search(array, 3))
self.assertEqual(-1, jump_search(array, 7))
self.assertEqual(-1, jump_search(array, -1))
def test_next_greatest_letter(self):
letters = ["c", "f", "j"]
target = "a"
self.assertEqual("c", next_greatest_letter(letters, target))
self.assertEqual("c", next_greatest_letter_v1(letters, target))
self.assertEqual("c", next_greatest_letter_v2(letters, target))
letters = ["c", "f", "j"]
target = "d"
self.assertEqual("f", next_greatest_letter(letters, target))
self.assertEqual("f", next_greatest_letter_v1(letters, target))
self.assertEqual("f", next_greatest_letter_v2(letters, target))
letters = ["c", "f", "j"]
target = "j"
self.assertEqual("c", next_greatest_letter(letters, target))
self.assertEqual("c", next_greatest_letter_v1(letters, target))
self.assertEqual("c", next_greatest_letter_v2(letters, target))
def test_interpolation_search(self):
array = [0, 3, 5, 5, 9, 12, 12, 15, 16, 19, 20]
self.assertEqual(1, interpolation_search(array, 3))
self.assertEqual(2, interpolation_search(array, 5))
self.assertEqual(6, interpolation_search(array, 12))
self.assertEqual(-1, interpolation_search(array, 22))
self.assertEqual(-1, interpolation_search(array, -10))
self.assertEqual(10, interpolation_search(array, 20))
if __name__ == '__main__':
unittest.main()