ACM programming problems

ACM programming problems archive:

http://www.ntnu.edu.tw/acm/ProblemSetArchive.html

Overflow in Binary search

Overflow in Binary search:
http://googleresearch.blogspot.com/2006/06/extra-extra-read-all-about-it-nearly.html

Apparently this bug was there in Java libraries till JDK 6.0

How to increase sudo timeout in linux

If you are tired of typing sudo too many times:
http://www.go2linux.org/disable-cache-password-sudo

Same procedure for disabling can be used for increasing as well. Just add a line to /etc/sudoers file through visudo

Defaults:userName timestamp_timeout = 20