Create a script that prints nth order forward difference series. You should be a able to pass the list of numbers and order number as command line parameters.
| Series | 5 | 9 | 2 | 8 | 1 | 6 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Order | |||||||||||||
| 1 | (9-5) | (2-9) | (8-2) | (1-8) | (6-1) | ||||||||
| 4 | -7 | 6 | -7 | 5 | |||||||||
| 2 | (-7-4) | (6+7) | (-7-6) | (5+7) | |||||||||
| -11 | 13 | -13 | 12 | ||||||||||
| 3 | (13+11) | (-13-13) | (12+13) | ||||||||||
| 24 | -26 | 25 | |||||||||||
| 4 | (-26-24) | (25+26) | |||||||||||
| -50 | 51 | ||||||||||||
| 5 | (51+50) | ||||||||||||
| 101 | |||||||||||||
I spent this week in Rīga at the Perl Conference. I had two talks there, a standard 20-minutes one and a lightning talk (5 minutes). I dedicated all my free time to the preparation of the slides, but fortunately the assignments were rather easy this week, so I submitted the solutions on Monday already before leaving for Rīga.
This week’s challenge was a bit easier than the recent ones, but I was glad for that. The Perl Conference in Riga is coming and I still don’t have my slides ready!
Write a script to display months from the year 1900 to 2019 where you find 5 weekends, i.e. 5 Fridays, 5 Saturdays, and 5 Sundays.
I started by running the cal utility (part of the util-linux package) to see how such months might look. For example, this is the output of cal 1904 (5 weekends highlighted manually be me):
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