500-miles

Your mission

Given a connection timeout and a target's distance, decide whether the mail is delivered or bounced, the way a too short timeout drew a circle around the campus.

today's brief

1994, University of North Carolina. A sysadmin named Trey Harris gets one of the strangest bug reports ever: the statistics department cannot send email more than 500 miles. Not to certain servers, literally anything past a 500 mile radius bounces. A sendmail upgrade had reset the connection timeout to almost nothing, so mail only reached machines close enough for light to make the trip inside that tiny window. Do the math the mailer stopped doing.

See it in action

./main 3000 500000

Expected result

899377
delivered

Your checklist

For your own tracking. Tests grade your code.

Two arguments: the timeout in microseconds, then the target distance in meters. Both are non-negative integers.
Light travels 299792458 meters per second, so in t microseconds it reaches 299792458 * t / 1000000 meters (integer division). Print that reach on its own line.
If the target distance is at most the reach, print delivered on the next line. Otherwise print bounced.
If the program does not receive exactly two arguments (argc must be 3), print wrong number of arguments followed by a newline.

More examples

./main 3000 2000000

Expected result

899377
bounced

Constraints

Expected files

main.c

Allowed functions

printfatol

Back to compete

Solutions

500-miles

Your mission

Given a connection timeout and a target's distance, decide whether the mail is delivered or bounced, the way a too short timeout drew a circle around the campus.

today's brief

See it in action

./main 3000 500000

Expected result

899377
delivered

Your checklist

For your own tracking. Tests grade your code.

Two arguments: the timeout in microseconds, then the target distance in meters. Both are non-negative integers.
Light travels 299792458 meters per second, so in t microseconds it reaches 299792458 * t / 1000000 meters (integer division). Print that reach on its own line.
If the target distance is at most the reach, print delivered on the next line. Otherwise print bounced.
If the program does not receive exactly two arguments (argc must be 3), print wrong number of arguments followed by a newline.

More examples

./main 3000 2000000

Expected result

899377
bounced

Constraints

Expected files

main.c

Allowed functions

printfatol

Back to compete

Solutions