@ problem1.py problem1a
[8, 20]
0

[5, 10]
1

[6, 6]
1

[6, 28]
2

[2, 2000]
3

[6, 496]
3

[8000, 8200]
1

[8129, 8200]
0

@ problem1.py problem1b
[20]
1

[496]
3

[495]
2

[497]
3

[5]
0

[1]
0

@ problem1.py problem1c
[2, 4]
262

[4, 1]
10

[5, 3]
15291

[10, 6]
454545454546

[3, 5]
73593

[6, 7]
94509996309