OBI Warmup

This saturday there will be a contest at URI, entitled Aquecimento para a OBI (OBI Warmup).
Apply here: [link].

The contest difficulty will be similar to the OBI tests: problems of level easy and medium.

After the contest I am going to write an editorial with the solutions to the problems, here at the blog.
Good luck.

Contest Delta – Editorial (Part 2)

At the Contest Delta, three exercises stood out among the others in difficulty, and I decided to make a separate post to talk about them, because their solutions are more complex. The first part of the editorial can be found here: [link].

The exercises are:
Fibonacci Again! [link];
How Many Substrings? [link];
Entangled Ropes [link];

All of them were written by the same person, Gabriel Dalalio, and a great amount of what I am going to write here it was him who taught me.

Click at the link below to see the editorial.
Continue reading Contest Delta – Editorial (Part 2)

Contest Delta – Editorial

Hey, today occurred tha second open contest at URI, the Contest Delta, where I wrote 5 from the 13 problems available at the contest. I thank Ricardo Oliveira for reviewing my problems. The other problems were written by Neilor Tonin, Lucas Negri, Márcio Oshiro and Gabriel Dalalio.

Congratulations to the winners of the contest:
1st place: Fernando Fonseca
2nd place: Igor Wolff
3rd place: Márcio Barbosa

The winners got the following shirt:
http://34.210.26.18/wp-content/uploads/2014/03/camiseta.png
Cool, right?

This editorial has 9 out of the 13 exercises from the contest. The other 4 exercises are going to be writeen soon, in a different post.

Click at the link below to see the editorial.
Continue reading Contest Delta – Editorial

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