On 24/04/2017 09:20, Robert L. wrote:
Create a function that takes a list of integers in increasing
order and returns a correctly formatted string in the range
format.
Use the function to compute and print the range formatted
version of the following ordered list of integers. (The
correct answer is: 0-2,4,6-8,11,12,14-25,27-33,35-39.)
0, 1, 2, 4, 6, 7, 8, 11, 12, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 27, 28, 29, 30, 31, 32, 33, 35, 36,
37, 38, 39
list = [0, 1, 2, 4, 6, 7, 8, 11, 12, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 27, 28, 29, 30, 31, 32, 33, 35, 36,
37, 38, 39]
old = list[0]
list.slice_before{|n| [n-old>1,old=n][0]}.
map{|a| a.size<3 ? a.join(",") : [a[0],a[-1]].join("-")}.
join ","
===>
"0-2,4,6-8,11,12,14-25,27-33,35-39"
Is this supposed to be Python code? Because it doesn't seem to work. I
thought it might use advanced Python features I didn't know about.
--
bartc
(Regarding this particular task, one of my languages has it built-in
(for a 'set' object not a list):
println [0, 1, 2, 4, 6, 7, 8, 11, 12, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 27, 28, 29, 30, 31, 32, 33, 35, 36,
37, 38, 39]
Output is:
[0..2,4,6..8,11..12,14..25,27..33,35..39]
It uses ".." rather than "-" so that the output is legal program syntax.
35-39 would be interpreted as -4.)
--
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