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thanx!!

Hi, could anybody explain me what is a 2-3-4 tree is, how it works, I cannot understand though I read some materials already. it is better to show in a short example, thanks!

Oh! I see, thank you!

can anybody tell me what does this compiling error mean?
stack_01.c: In function `main':
stack_01.c:64: warning: return type of `main' is not `int'
Undefined first referenced...

And by the way, I wonder what the mean by return -1.