This application can give you suggestion about your voting choice. A user can make a list of politicians and their own views in the source file. Ask the application which politician is the most suitable to vote for in next elections.

This application has two modes:

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I had to write this application as a university project.

The task was to generate a word ladder, which starts and ends on provided words. Both words have to be in a dictionary.

Every single step in the ladder must only differ in one character from the word before. The aim of the word-ladder is to find the shortest path from start word to end word in the whole graph.

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I check today some old CDs, some of them were from ’90 so of course they didn’t work. With one of them was a problem with reading… and ejecting CD-ROM. My PC wasn’t able to eject the CD even calling this command from root:

eject sr0 -rm

didn’t work.

DMESG said:

[ 1067.416522] Buffer I/O error on device sr0, logical block 0
[ 1075.923084] sr 1:0:0:0: [sr0] Unhandled sense code
[ 1075.923088] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 1075.923097] sr 1:0:0:0: [sr0] Sense Key : Hardware Error [current]
[ 1075.923105] sr 1:0:0:0: [sr0] Add. Sense: Timeout on logical unit
[ 1075.923115] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00
[ 1075.923130] end_request: I/O error, dev sr0, sector 0
[ 1075.923137] Buffer I/O error on device sr0, logical block

The CD wasn’t mounted, there was only a thread for the device, which wasn’t even mounted (I also wasn’t able to mount it from root):

umount: /dev/sr0: not mounted

 

Solution:

root@Agilob-PC:# lsof /dev/sr0
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
blkid 4079 root 3r BLK 11,0 0t0 7203 /dev/sr0

root@Agilob-PC:# kill -s 9 4079
root@Agilob-PC:# eject

Worked for me!