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pb071(pexam): adjust the exam before the seminars
* move the file * remove the queries * adjust the output Signed-off-by: Matej Focko <xfocko@fi.muni.cz>
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1 changed files with 51 additions and 84 deletions
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@ -1,4 +1,5 @@
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---
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slug: cams
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title: Practice exam C
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description: |
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Stalking cars…
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@ -24,9 +25,9 @@ description: |
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Your task is to write a program `cams` that will be processing input from the
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cams that are capable of identifying license plates on the cars and then
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evaluate the queries on the given data. Your contributions to the society are
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print out summary based on the input data. Your contributions to the society are
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very much appreciated and may (or may not) be used for (each or none) of the
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following purposes:
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following purposes[^1]:
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* stalking people leaving and coming back home,
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* retroactively making people pay for the parking,
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@ -34,32 +35,19 @@ following purposes:
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* tracking people that don't pay tolls, or
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* convict employees leaving the work prematurely.
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## Format of the input files
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## Format of the input file
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Input for your program consists of the data from the cameras and queries. You
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will be **always** given the data from the cameras as a path to a file, whereas
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user should be able to specify `-` (i.e. `stdin`) as the path to queries.
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:::tip Validation of data
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For the sake of simplicity (and partially relieving the time pressure), you
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**are not** required to validate the dates you are given on the input (e.g. leap
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years, days in months, etc.).
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This is caused by the fact that you will be given just a timestamp that you
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**don't** need to process in any (other than suggested ways for debugging).
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:::
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### Data from the cameras
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Input for your program consists of the data from the cameras. You will be given
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the data from the cameras as a path to a file and user should also be able to
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specify `-` (i.e. `stdin`) as the path.
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Each “scan” (i.e. reading) of the cameras consists of the following data:
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* _camera ID_: non-negative integer identifying a camera
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* _plate_: string of unknown length that can consist of any characters apart
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from whitespace
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* _timestamp_: timedate of the scan as an unsigned integer (represented as a
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UNIX time)
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* _timestamp_: date and time of the scan as an unsigned integer (represented as
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a UNIX time)
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:::tip
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@ -74,7 +62,7 @@ And they are compiled into one reading such as:
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camera_ID: plate timestamp
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There should be always **at least one** space in between each part of the
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reading. Reading are separated by the commas, which may, but don't have to, be
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reading. Readings are separated by the commas, which may, but don't have to, be
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accompanied by whitespace around.
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#### Examples
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@ -87,66 +75,42 @@ Few examples of the data from the cameras follow
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11: EL9-987 1679541338 ,2 : Foo-666 1683170082,42: YourMum 1683170082,
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42: TryToCatchMe 1671602419 , 1234: TryToCatchMe 1671602419,
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19: ABC-12-34 1664659649, 69:YouShould-not-pLaCe-4ny-expectations%on^the(input 1680307994,
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9 : 9B9-161 1665416417 , 10: 1a1-999 1671602419,1:lmao 1633078256
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9 : 9B9-161 1665416417 , 10: 1a1-999 1671602419,1:lmao 1633078256,
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16: ABC-12-34 1664609012
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```
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### Queries
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Querying the processed data is done by providing a license plate. You can expect
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that the license plates are separated by `\n` (newline, also known as
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_ňjůlajn_) **with no other whitespace around**.
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#### Examples
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Few examples of the queries follow
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ABC-12-34
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TryToCatchMe
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Foo-666
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EL9-987
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## Format of the output
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:::info
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All the examples above consider using data from the first example of the input.
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All the examples consider using data from the example of the input.
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:::
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You may encounter these situations (and handle them in the following order):
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1. License plate was not found
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You are expected to print out the dates and cameras that has captured the
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license plate for each of them (in a sorted fashion).
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```
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404-not-found
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*** 404-not-found ***
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License plate was not found.
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```
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1. License plate was found
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If there are multiple scans present and the timespan (i.e. time difference
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between the scans is bigger than 60 minutes, you should separate them by a
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newline). For example:
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In such case, you are expected to print out the dates and cameras that has
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captured the license plate.
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```
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*** ABC-12-34 ***
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25: Fri Oct 1 10:50:56 2021
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If there are multiple scans present and the timespan (i.e. time difference
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between the scans is bigger than 60 minutes, you are to separate them by a
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newline).
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10: Sat Oct 1 09:18:32 2022
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16: Sat Oct 1 09:23:32 2022
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```
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ABC-12-34
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*** ABC-12-34 ***
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25: Fri Oct 1 10:50:56 2021
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10: Sat Oct 1 09:18:32 2022
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19: Sat Oct 1 23:27:29 2022
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```
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19: Sat Oct 1 23:27:29 2022
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```
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:::tip
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:::tip
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Since you are given the timestamp in a `time_t` compatible type on UN\*X, you
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can safely use `ctime(3)` for printing the timestamp as a _human readable_ time
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when outputting the date and time.
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Since you are given the timestamp in a `time_t` compatible type on UN\*X, you
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can safely use `ctime` for printing the timestamp as a _human readable_ time
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when outputting the date and time.
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:::
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:::
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:::tip
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@ -161,36 +125,37 @@ of the output.
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You can also have a look at example usage of your program. We can run your
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program from the shell like
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$ ./cams example_1.txt -
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$ ./cams example_1.txt
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And then provide the queries, since we specified `-` as the file for the queries
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And it will produce an output:
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> ABC-12-34
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*** ABC-12-34 ***
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25: Fri Oct 1 10:50:56 2021
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10: Sat Oct 1 09:18:32 2022
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16: Sat Oct 1 09:23:32 2022
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19: Sat Oct 1 23:27:29 2022
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> NonExistentLicensePlate
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*** NonExistentLicensePlate ***
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License plate was not found.
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> EL9-987
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*** EL9-987 ***
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11: Thu Mar 23 04:15:38 2023
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> TryToCatchMe
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*** Foo-666 ***
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2: Thu May 4 05:14:42 2023
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*** TryToCatchMe ***
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42: Wed Dec 21 07:00:19 2022
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42: Wed Dec 21 07:00:19 2022
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1234: Wed Dec 21 07:00:19 2022
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:::info
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Lines prefixed with `> ` in the example above represent the user input.
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:::
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*** XYZ-98-76 ***
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289: Mon Oct 10 17:40:17 2022
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*** YouShould-not-pLaCe-4ny-expectations%on^the(input ***
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69: Sat Apr 1 02:13:14 2023
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*** YourMum ***
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42: Thu May 4 05:14:42 2023
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## Requirements and notes
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@ -207,3 +172,5 @@ Lines prefixed with `> ` in the example above represent the user input.
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management) should be handled in **the same way** as they were in the
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homeworks and seminars.
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* Your program **must free** all the resources before exiting.
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[^1]: Subject to NDA.
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