Perhaps I did not make my statement clearly. I agree with jephthah that assembly should be learned after C/C++ . I dont have much experience at microcontroller programming but I did try my hand at...

I have to agree with jephthah, I have programmed AVR and 8051 both in C. Though there is option to program in assembly but when sometimes it becomes difficult to learn the instruction set especially...

Another alternative.

a=a-b
b=b+a
a=b-a

inport() and outport() functions do work if you have opened the port. I use a software called Userport to do the same. Alternatively you could try inportb() and outportb(). Here is a tutorial on...

Factorial of any number greater than 5 ends with a zero. For a larger number, the number of zeroes at the end constitute a large part of the number. If you can eliminate those zeroes it will help.
...

What I would suggest is that you make a function of everything starting from "int g;" to the end of the while loop. Then in main() call the function inside another loop as

do
{
function_here();...

I dont understand, sum of the subset [5,10] is clearly greater than that of [5,-2,10]

In strcmp you are passing a pointer of node where you should pass a pointer of char.

Use else if statement. According to your code, if a=0 and b=0 then both the first and the second if statements will be executed. And the output will be
"There are no solutions"
"There is one...

You can clear the entire screen using the cleardevice() function and redraw the square in a loop with the new positions.

You can also try better options for searching such as making the BST threaded.