i didn't get it. plz tell me what do u mean by that.

That's neat and simple. Thanks for true pure logic.

It's not programming. It's primary math.

It's not programming. It's primary math.

in 1st sample test (C) ",+[-.,+]" at the end of input string after it reads (,) ending character (\0) it then increments it (+) and this causes to loop again (]) reading next input (outside of range), outputing etc. What do I miss to understand the algorithm. How the loop is supposed to end?

and also... Why would Mary be more pleased traveling the biggest mileage rather than just visiting towns?

Yeah, is this kind of way to hide part of the solution in some preloaded sections in order for it to look shorter and therefore more clever? I saw similar solutions and couldn't get the point. It shall be prohibited.

I was able to pass it finally (C) but with a lot of struggle. Can somebody knowledgeable about double pointers help me understand 2 things:

1. Why this task requires to return double pointer (pointer to array of pointers) rather than just single pointer to table of "Pair"s? Wouldn't it be easier?
2. How do I know from task description (it says to return "array of Pairs") or test code that I shall return pointer to array of pointers (each pointing to "Pair") rather than pointer to pointer to array of "Pair"s? Both would work I guess.

what's the idea behind log10.. + 5?

can someone explain issue to me?

In the preloaded section but you can't access it.

Where is 'compare_ints' defined?

It does compare addresses, there were no such tests. Tests updates, it shouldn't work now.