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1. is there anything to do with the order of output ?
i mean :
if there is a input like:
a b c d e
#
b c d e a
#

then the following 2 generated outputs will be both correct?
b c d e a
or
a b c d e
?

2. if the input is:
a b a a
#
a a
#
c d e
#
d e c
#
#
ff
#
g
#
#
#
#
=======EOF ...

the inputs of this question contains blank line,

remember to use gets(str); to read a input string

thank you very much

i learn something again

thx

can you give me some idea ?
or tell me where i can find the anser to similar problem

thx