Algorithm 版 (精华区)
发信人: pamws (书虫), 信区: Algorithm
标 题: 1324P-Unix ls-ZJU
发信站: 哈工大紫丁香 (2002年10月11日22:11:44 星期五), 站内信件
Unix ls
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Time limit: 30 Seconds Memory limit: 32768K
Total Submit: 37 Accepted Submit: 7
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The computer company you work for is introducing a brand new computer line a
nd is developing a new Unix-like operating system to be introduced along wit
h the new computer. Your assignment is to write the formatter for the ls fun
ction.
Your program will eventually read input from a pipe (although for now your p
rogram will read from the input). Input to your program will consist of a li
st of (F) filenames that you will sort (ascending based on the ASCII charact
er values) and format into (C) columns based on the length (L) of the longes
t filename. Filenames will be between 1 and 60 (inclusive) characters in len
gth and will be formatted into left-justified columns. The rightmost column
will be the width of the longest filename and all other columns will be the
width of the longest filename plus 2. There will be as many columns as will
fit in 60 characters. Your program should use as few rows (R) as possible wi
th rows being filled to capacity from left to right.
Input
The input will contain an indefinite number of lists of filenames. Each list
will begin with a line containing a single integer (1 <= N <= 100). There w
ill then be N lines each containing one left-justified filename and the enti
re line's contents (between 1 and 60 characters) are considered to be part o
f the filename. Allowable characters are alphanumeric (a to z, A to Z, and 0
to 9) and from the following set { ._- } (not including the curly braces).
There will be no illegal characters in any of the filenames and no line will
be completely empty.
Immediately following the last filename will be the N for the next set or th
e end of file. You should read and format all sets in the input.
Output
For each set of filenames you should print a line of exactly 60 dashes (-) f
ollowed by the formatted columns of filenames. The sorted filenames 1 to R w
ill be listed down column 1; filenames R+1 to 2R listed down column 2; etc.
Sample Input
10
tiny
2short4me
very_long_file_name
shorter
size-1
size2
size3
much_longer_name
12345678.123
mid_size_name
12
Weaser
Alfalfa
Stimey
Buckwheat
Porky
Joe
Darla
Cotton
Butch
Froggy
Mrs_Crabapple
P.D.
19
Mr._French
Jody
Buffy
Sissy
Keith
Danny
Lori
Chris
Shirley
Marsha
Jan
Cindy
Carol
Mike
Greg
Peter
Bobby
Alice
Ruben
Sample Output
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12345678.123 size-1
2short4me size2
mid_size_name size3
much_longer_name tiny
shorter very_long_file_name
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Alfalfa Cotton Joe Porky
Buckwheat Darla Mrs_Crabapple Stimey
Butch Froggy P.D. Weaser
------------------------------------------------------------
Alice Chris Jan Marsha Ruben
Bobby Cindy Jody Mike Shirley
Buffy Danny Keith Mr._French Sissy
Carol Greg Lori Peter
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