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#! /usr/bin/python3
from itertools import chain
def sortedmatrix(matrix):
n = list(chain.from_iterable(matrix))
n.sort()
return n[2]
import unittest
class TestSortedmatrix(unittest.TestCase):
def test_ex1(self):
self.assertEqual(sortedmatrix([[3, 1, 2], [5, 2, 4], [0, 1, 3]]), 1, 'example 1')
def test_ex2(self):
self.assertEqual(sortedmatrix([[2, 1], [4, 5]]), 4, 'example 2')
def test_ex3(self):
self.assertEqual(sortedmatrix([[1, 0, 3], [0, 0, 0], [1, 2, 1]]), 0, 'example 3')
unittest.main()
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