There was one kind of question which I really liked and I thought to share those.

We had to give the shortest way to express following 5 things in function of min(a,b) , max (a,b) (which return respectively the minimum and the maximum of the 2 given parameters) ,+,-,/ and *.

1. The greatest of 3 numbers a b and c

2. The absolute value of any number a.

3. The difference between a and the one closest to a. (a b and c as inputs)

4. If a<b: return 0 ; else return b (a and b are positive and a is not b)

5. same as 4. but a and b are integers. (note that for integers 3/5 is not 0.6 but 0 and a remainder of 3). This one should be shorter than the solution of 4.

5 was the only question I didn't answer correctly. Can you find the solutions to all 5?

]]>There is no required knowledge of any programming language, so it's just about the logics behind programming and a few algorithms.

In fact I don't know many of them. The only one I could think of is Dijkstra's algorithm and the shunting yard algorithm.

But I am sure that they won't ask anything about the shunting yard algorithm and dijkstra seems very intresting.

Now my question is if you know a few algorithms which could be useful? I don't think they will ask anything about arithmetic stuff such as karatsuba and fourier(?) for multiplication and stuff.

Thanks in advance.

]]>it is a quite good program but it's dated from 2001 I believe, so it is old. I was wondering if there are more programs like this because I have been searching for it for a quite long time but I can not find it.

I would also be interested in some real version of this but I don't know where to find it either.

Can anyone help me out? ]]>

`#lang racket (require picturing-programs) (require racket/math) (require racket/draw) (define (draw image) (define (grey-function x y red green blue) (define n (floor (+ (* .587 green) (* .299 red) (* .114 blue)))) (cond [(< n 42.5) 0] [(< n 127.5) 85] [(< n 212.5) 170] [else 255] )) (map3-image grey-function grey-function grey-function (scale .5 image)))`

I scaled the images down, since the calculator screen is so small. This can be adjusted. The brightness/darkness can be adjusted by changing the 42.5, 127.5, and 212.5.

To run the program, you would need an environment (DrRacket). A bit annoying, but oh well.

I might make a similar program in Java soon.

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