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Completed at: 2023-10-07T04:04:44.057Z
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Completed languages: java
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Tags: Fundamentals
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Rank: 7 kyu
In a factory a printer prints labels for boxes. For one kind of boxes
the printer has to use colors which, for the sake of simplicity,
are named with letters from a to m.
The colors used by the printer are
recorded in a control string. For example a "good" control string would be
aaabbbbhaijjjm meaning that the printer used three times color a, four times
color b, one time color h then one time color a...
Sometimes there are problems: lack of colors, technical malfunction and a "bad"
control string is produced e.g. aaaxbbbbyyhwawiwjjjwwm with letters not from a to m.
You have to write a function printer_error which given a string will return
the error rate of the printer as a string representing a rational whose numerator
is the number of errors and the denominator the length of the control string.
Don't reduce this fraction to a simpler expression.
The string has a length greater or equal to one and contains only letters
from ato z.
s="aaabbbbhaijjjm"
printer_error(s) => "0/14"
s="aaaxbbbbyyhwawiwjjjwwm"
printer_error(s) => "8/22"