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exercises.md
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@ -158,7 +158,7 @@ Bear in mind the main purpose of this quiz is for you to test your understanding
51. A symmetric [relation](relation.md) is that for it hold that if A is in relation with B, then also B is in relation with A (for example "is married to"). Antisymmetric relation is that for which it holds that if A is in relation with B and A is distinct from B, then B is NOT in relation with A (for example "is parent of"). Give an example of relation that is both symmetric and antisymmetric.
52. Is [LGBT](lgbt.md) [good](good.md)?
53. Write a [C](c.md) function in 60 characters or fewer that takes a string (`char *`, consider zero terminated ASCII string) and replaces all semicolons in it with colons (`;` -> `:`). It can return nothing (`void`).
54. Order the following [people](people.md) by date of their birth from oldest: [Alan Turing](turing.md), Caesar, [Buddha](buddha.md) (Siddhartha Gautama), Johannes Gutenberg, Aristotle, [Charles Babbage](babbage.md), [Linus Torvalds](torvalds.md), [Jesus](jesus.md), [Adolf Hitler](hitler.md), Muhammad (prophet of Islam), [Albert Einstein](einstein.md), [Richard Stallman](rms.md), Napoleon, Leonardo da Vinci, [Karl Marx](marx.md).
54. Order the following [people](people.md) by date of their birth from oldest: [Alan Turing](turing.md), [Diogenes](diogenes.md) (Greek philosopher), Caesar, [Buddha](buddha.md) (Siddhartha Gautama), Johannes Gutenberg, Aristotle, [Charles Babbage](babbage.md), [Linus Torvalds](torvalds.md), [Jesus](jesus.md), [Adolf Hitler](hitler.md), Muhammad (prophet of Islam), [Albert Einstein](einstein.md), [Richard Stallman](rms.md), Napoleon, Leonardo da Vinci, [Karl Marx](marx.md).
55. Start with number 967; in each step you can either add all the digits (e.g. 456 -> 4 + 5 + 6 = 15), multiply all the digits (e.g. 45 -> 4 * 5 -> 20) or shuffle the digits in any way (e.g. 320 -> 23); your goal is to get to number 3. { This one is mine. ~drummyfish }
56. State at least 5 reasons for why [Rust](rust.md) sucks so much.
57. Find at least one function *f(x)* that's defined for all non-negative integers and for which it holds that *x + f(x) - f(x + 1) = 0*. (It's enough if you show a sequence of numbers with obvious continuation.)
@ -221,7 +221,8 @@ Bear in mind the main purpose of this quiz is for you to test your understanding
114. Write code in [Brainfuck](brainfuck.md) that copies the value in current cell to the cell on to the right, while KEEPING the value in current cell. Of course you may use another temporary cell to do this.
115. What's the first sentence of the lyrics of the [Free Software](free_software.md) Song by [Richard Stallman](rms.md)?
116. Consider we record moves in [chess](chess.md) with a simple notation as *<SQUARE_FROM><SQUARE_TO>*, for example *e3e5* or *g1f3* (i.e. we don't care about which chessman moves, if check or promotion happens etc., only start and end square are recorded). How many such moves exist if we only consider those that can ever legally happen (i.e. don't count moves such as *a2g1*, *b3b3* and so on)? Castling just means moving the king to his castled position.
117. Did you enjoy this quiz?
117. We keep hearing about "first world" and "third world", but what about "second world"? Why is that term not used?
118. Did you enjoy this quiz?
### Answers
@ -342,7 +343,8 @@ sin(x) / cos(x) - log2(2) = tg(x) - 1*, so we get *tg(x) >= 1*. So that will hol
114. For example `[->+>+<<]>>[-<<+>>]<<`: first we copy the current cell into TWO cells to the right -- one of them is used as a temporary cell; after this we use another loop to copy the value from the temporary cell back to the original location that we zeroes during the first copying.
115. "Join us now and share the software."
116. Should be 1792 { Unless I counted it wrong lol. ~drummyfish }. We can count this by just considering each square on the board and summing all possible queen and knight moves from that square (queen and knight together cover all possible moves). Queen can obviously end up on any square and from knight's walk we know we can place a knight anywhere as well. This can probably be computed even manually but writing a quick program does the job quicker.
117. yes
117. The term "second world" used to exist -- during the Cold War "first world" was used for the "western world", countries allied with US/NATO; the "second world" meant the "USSR world", and "third world" everyone else. After dissolution of Soviet Union the second world basically stopped existing, or rather merged with the first world, and since then the terms got more of an economical meaning rather than political.
118. yes
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