Anything is possible, unless it's not

Tuesday, December 28, 2010

EoY 2010

Hello World!!

We're approaching the end of year 2010! I'm happy because I:
  • have my holiday here, in Bogor, my hometown. It is colder than Serpong, town of my school 60 km (SI: 6 . 103 m; imp: 35 mi.) away. It rains almost everyday in December! To me, it feels like going to Mt. Pangrango because Serpong feels like it's much hotter than Bogor.

    Average max temperature: Serpong: 32 °C (90° F, 305 K); Bogor: 25 °C (77 °F, 298 K)

  • moved my house (well, actually it's my father's) to Yasmin. It's a hilly, green, and cool place located north of Bogor city. Previously I lived in Ciwaringin, moderately hot and dense place in Central Bogor. Thank God!

  • re-learned and remembered how to hack simple applications by disassembling and debugging executables, and then manipulating its memory data. I managed to crack Minesweeper to make the mines gather in the top on the board. (I primarily use OllyDbg 2.01a)

  • celebrated Christmas in my church. I sat in the main hall, on the frontmost row of seat! It's (relatively) hard to get such seats in Christmas. I had to wake up early in the morning.

  • tasted bitter hot chocolate drink. I like it.

  • have been using Dvorak keyboard layout for one year.

  • have been liking my crush for 2 years.

Saturday, November 13, 2010

Can you solve these problems?

(Problem 1.) Given real constants a, b, c, ... , z
that satisfies a5 = b; b5 = c; c5 = d; ... ; y5 = z
If a = 2010, find the value of (x-a)(x-b)(x-c)...(x-z).

(Problem 2.) Find the value of cos(1) cos(2) cos(3) ... cos(2010).
Note: cosines are expressed in degrees, not radians.

(Problem 3.) x2 + x + 1 = 0 have two complex solutions, a and b.
Find the value of a(28081996+17081945) + b(24031995+1113636363636)

(Problem 4.) If x is a positive real number,
what is the minimum value of xx ?
Express the answer in terms of e (Euler's constant).

Saturday, November 6, 2010

My first trophy...

From left to right: Verdiyanto Saputra, and Ivan Masli (SMAK 1 BPK PENABUR Jakarta), Samuel Wirajaya (me), and Ardyanto Widjojo, the jury, Hendrik L. Medlama, and Regina Chandra (SMAK BPK PENABUR Gading Serpong)

Hello world...
I really miss my own blog...

Last week is one of the best weeks I ever had. Actually, the title should be "my second trophy" but I mean, this is my first trophy since I'm in the senior high school (Sekolah Menengah Atas or SMA in Indonesia).

I registered myself and my partner Ardyanto Widjojo in a physics competition called Einstein Competition, held by Universitas Negeri Jakarta (UNJ). In 24 October, 2010, at UNJ's library hall, me and Ardyanto W. took the selection test. The test was consisted of 40 multiple choice problems.

I was surprised when I heard that I and Ardyanto were in the top 15, and made it to the semifinal test. The semifinal test consisted of problems with short answers, and crosswords about physics concepts. We made it to the first rank! I and Ardyanto was selected to the final test. The finalists (ordered by semifinal score) was:

  1. Ardyanto Widjojo and Samuel Wirajaya, SMAK PENABUR Gading Serpong
  2. Ivan Masli and Verdiyanto Saputra, SMAK 1 PENABUR Jakarta
  3. Hendrik Lewu Medlama and Regina Chandra, SMAK PENABUR Gading Serpong
All of the three was PENABUR students. 2 of my school, another one was from SMAK 1 "smukie" PENABUR Jakarta (one of the best schools in Jakarta). This was a problem, since I and Ardyanto are 10th graders, and "smukie" finalists are 12th graders. (Regina and Hendrik are my schoolmates. They are 10th and 11th grader, respectively), i.e. we were youngest competitors.

In the first part of the test, we beat "the smukiez" by 70 points. In the last seconds, the smukiez gained 90 points by answering a question correctly! My heart beat hard. But Ardyanto and I answered the last correctly, the 100 point question! "Yay! First place!" we shouted. "Sudden death.." said Ivan Masli from smukie.

Extra: We also watched the semifinal for Galileo Competition, physics competition for junior high school students, held in the same place by the same instance. One of the finalist (she's from SMPK 2 PENABUR Jakarta) was a physics master... She always rung the bell, start calculating, and answered the questions. Correctly. Without help from her partner. (By the way, she's cute). And she won the first place.

[Second extra: I got enough money (from the prize) to buy Canon 50mm f/1.8 lens.]

[Third extra: My classmates did demand me and Ardyanto to buy (and pay for) pizzas to celebrate it! Oh no!]

Sunday, July 11, 2010

SMAK PEnabur Gading Serpong

Hello World!

Thank God! I'm now studying in SMAK Penabur Gading Serpong!

You can read more about it at Actually it's the "Brilliant Class" program of this school.

I also want to thank my friends, and (of course) Mr. Endar Jananta (my physics teacher, without him i wouldn't get my silver medal in 2009 National Science Olympiad. The medal helped me a lot :).

Friday, May 14, 2010

Master Pyramorphix

Hello World,

My friend Indra Samala just brought to me a brand new piece of !!i!. Actually it was a twisty puzzle. It is called Master Pyramorphix. It looks like pyramid in shape, but it's a little bit rounded. But, unlike the Rubik's Cube, to play it, you don't twist the faces. Instead, we twist the edges! We can deform the puzzle into many kinds of abstract, or even irregular shapes, hence the name 'pyraMORPHix'.

Actually, if you examine the group of pieces that twists, it's similar to Rubik's cube in structure and in the solution. The six "edge pieces" are actually the center pieces, and they are fixed relative to each other.

Originally posted in


Hello world

Most of the computer users know this little time-waster. It is one of the most successful games on the Earth. But most of my friend cannot solve the board. The rules are simple: click on any square to uncover it, but if you uncover a mine, you're dead and have to restart the game from the beginning.

Most of my friends don't know what the numbers mean. The numbers indicates how many mines are surrounding the square. It sounds as simple as pie, but you have to use your logical reasoning ability to analyze the number patterns and know where the mines are, and which square is safe to click.

I use Minesweeper Clone 2007. It have many features that help me to become a better mine-sweeper. I use the Win9x skin because it reminds me of my childhood... my father often play the game with me sitting on his lap. I love the colorful, small numbers..

Wednesday, May 12, 2010


Hello world,

Three days ago, my friend Indra Samala brought me a new piece of ***s*i* [1]: it's called Megaminx.

Megaminx is one of the twisty puzzles, like Rubik's Cube, but Megaminx is dodecahedron-shaped. It has twelve pentagonal sides. There are 100,669,616,553,523,347, 122,516,032,313,645,505,168,688,116,411,019,768,627,200,000,000,000
possible arrangements of colors in a Megaminx, while a 3x3x3 Rubik's Cube has 43,252,003,274,489,856,000 combinations. Although the number of combinations is much greater than Rubik's Cube, and the shape is different, the solving principles are the same.

After Samala gave an example solve in front of me, I could solve it in 15 minutes. Because most of the algorithms are adapted from the 3x3 Rubik's Cube algorithms.

[1] plastic

Originally posted in


Hello World,

I just learned how to use LaTeX. LaTeX is a markup language used for typesetting with TeX. Its major features consist of macros, mathematical formulas, and automatic typesetting. The automatic typesetting (of course) makes it easier to create lengthy reports, books, papers, etc. For example, if one wants to create a table of contents, simply type \tableofcontents and TeX will add a complete table of contents.

Headache formulas, fuzzy equations can be easily added into and displayed in the document, easier than any ordinary word processors.

References (see Section x.xx) are more flexible. If we add some sections before the section we refer (thus changing the section number), we won't need to change the reference to that section. LaTeX will do it automatically.

I'm still using a text editor to edit LaTeX files, rather than WYSIWYG or WYSIWYW (wysiwy want) editor. So I have to type a lot...

Originally posted in

2x2x2 Rubik's Cube Speedcubing Method

Have you ever seen a 2x2x2 Rubik's Cube? Do you want to know how to solve it? (in less than 5 seconds?) You can use 3x3x3 algorithms, but this is the 2x2x2 method. It's called simplified Ortega method. There are only 12 algorithms to remember, and, with this method, if fully mastered, you can solve the cube in 5 seconds or less. But I'm too lazy to master it, I'm contented with my 8-second personal best..

Step One: Assemble the first face (it is not necessary to build one layer, just make one of the faces of the cube displays a solid color. I like white.) Then turn the cube upside-down.

Step Two: Use one of the Fridrich's OLL (Orient Last Layer) algorithms to assemble the opposite side. (blue or yellow. In Rubik's original brand cube, it's blue)

Step Three: Use one of the Permute Both Layers algorithms to permute the pieces.

If you follow these steps and your cube is now solved, "Congratulations". Tell me if there are errors or something. bye.

Originally posted in

My masterpiece: my most controversial blog post..

Dvorak Simplified Keyboard (DSK)

Hello world,

I'm new to Dvorak Simplified Keyboard. It's said that DSK can help us type faster. But my typing speed plummeted from 80 to 10 wpm :( because I'm new.

My reason to learn this keyboard layout is because I heard that fastest typers in the world use this kind of layout.

The placements of letters in the DSK are different from QWERTY. The home-row keys are changed to AOEU-ID-HTNS, not ASDF-GH-JKL. Here is the story:

QWERTY keyboards has become tradition among the computer users. Actually, the QWERTY layout is designed for old typewriters to prevent typebars from jamming. So QWERTY is obsolete since computers don't have typebars.

So, in the 1930s, Dr. August Dvorak developed his own layout and patented it. Although failed to supersede QWERTY in usage (this is the reward of being the first), DSK has become supported by a wide range of computer operating systems since 1980s.

Originally posted in

Rubik's Cube

Hello world,

If you cannot solve the Rubik's Cube, I won't teach you in this post, but you can see Even Justin Bieber can do it, so will you!

Rubik's Cube is a puzzle that shaped like a cube, colorful, and its pieces can be twisted in groups. According to the Solution Guide when I bought the Rubik's Cube Keychain, 1 out of 5 people in the world play it. Here is some excerpt from Wikipedia..

The Rubik's Cube is a 3-D mechanical puzzle invented in 1974 by Hungarian sculptor and professor of architecture ErnÅ‘ Rubik. Originally called the "Magic Cube", the puzzle was licensed by Rubik to be sold by Ideal Toys in 1980 and won the German Game of the Year special award for Best Puzzle that year. As of January 2009, 350 million cubes have sold worldwide making it the world's top-selling puzzle game. It is widely considered to be the world's best-selling toy. In a classic Rubik's Cube, each of the six faces is covered by 9 stickers, among six solid colours (traditionally white, red, blue, orange, green, and yellow). A pivot mechanism enables each face to turn independently, thus mixing up the colours. For the puzzle to be solved, each face must be a solid colour. Similar puzzles have now been produced with various numbers of stickers, not all of them by Rubik. The original 3×3×3 version celebrated its twenty-fifth anniversary in 2005.

Since I brought this cube the first time, my friends asked me to tell them how to solve it. I'm not a fast speedcuber, I usually solve the cube in 30-40 seconds, still far slower than Abel Brata and Erik Akkersdijk.

Replay of my solving can be seen in I'm currently learning how to solve larger cubes.

Originally posted in

Tuesday, May 11, 2010

History of Internet in Indonesia

Translated from Wikipedia bahasa Indonesia, ensiklopedia bebas

History of Internet in Indonesia begins in the early 1990s. At that time, Internet networks in Indonesia were known as "paguyuban network", where the spirit of cooperation and mutual assistance feels very warm among the users. It is somewhat different with Internet in its further development, which feels more commercial and individual in some of its activities, particularly in the activities which involve e-commerce.

Since 1988, there had been Internet users in Indonesia that utilize the British CIX and US Compuserve to access the Internet.

Based on the whois notes from ARIN and APNIC, the first Internet protocol that came from Indonesia is UI-NETLAB (, registered by University of Indonesia on 24 June 1988. RMS Ibrahim, Suryono Adisoemarta, Muhammad Ihsan, Robby Soebiakto, Putu, Firman Siregar, Adi Indrayanto, and Onno W. Purbo are some of the legendary names in the beginning of Internet development in Indonesia, 1992-1994. Each of them had contributed their competencies and dedication in writing Indonesia's computer network history.

Texts about existence of networks in Indonesia could be seen in some of the newspaper articles, such as KOMPAS article, entitled "Jaringan komputer biaya murah menggunakan radio" (Inexpensive computer network that uses radio technology) in the end of the year 1990. Also some short articles in Bandung Institute of Technology's Majalah Elektron (Electron Magazine) year 1989.

Around 1994, IndoNet, Indonesia's first commercial ISP, started to operate. At that time, POSTEL had not known Internet business gaps, and very few Internet users in Indonesia. Connection to Internet was done by dial-up modems by IndoNet, (a reckless step, maybe.) IndoNet was located in Rawamangun in University of Indonesia's lecturer complex, because Sanjaya's (leader of IndoNet) father was a University of Indonesia lecturer. IndoNet initially could be accessed with shell account with text mode, Lynx browser, and e-mail client Pine on AIX server.

Since 1995, some BBS's in Indonesia such as Clarissa have provided overseas Telnet access. By using Lynx remote browser, Internet users in Indonesia could access the HTTP.

The last development is e-commerce trending and public internet accessing (warnet/WARung interNET, literally means 'Internet shop' or 'Internet stall'), which supports Indonesian people to be more solid in the world of information.

Originally posted in


Hello world,

Let me introduce myself. My name is Samuel Wirajaya. I'm 15. My interests are twisty puzzles, computer games, and Wikipedia.

This is my second blog, which is similar to my first blog, but the blog posts are in English. I'm still a learner, and my English is not so good. So correct me if there are errors, or something.