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#! /usr/bin/python3
def luckynumbers(a):
maxs = set()
for x in range(len(a[0])):
max = (0, 0, 0)
for y in range(len(a)):
if a[y][x] > max[0]:
max = (a[y][x], y, x)
maxs.add(max)
mins = set()
for y in range(len(a)):
min = (a[y][0], y, 0)
for x in range(len(a[0])):
if a[y][x] < min[0]:
min = (a[y][x], y, x)
mins.add(min)
i = list(maxs.intersection(mins))
if len(i) > 0:
return i[0][0]
return -1
import unittest
class TestLuckynumbers(unittest.TestCase):
def test_ex1(self):
self.assertEqual(luckynumbers([[3, 7, 9], [9, 11, 13], [15, 16, 17]]), 15, 'example 1')
def test_ex2(self):
self.assertEqual(luckynumbers([[1, 10, 4, 2], [9, 3, 8, 7], [15, 16, 17, 12]]), 12, 'example 2')
def test_ex3(self):
self.assertEqual(luckynumbers([[7, 8], [1, 2]]), 7, 'example 3')
unittest.main()
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