ruby (66)

exit ARGF.read.tr('^[]','').tap{|x|0while x.gsub!('[]','')}.empty?

previously (68) it was:

exit ARGF.read.tr('^[]','').tap{|x| 0 while x.gsub!('[]','')}.empty?

Another equivalent solution uses

exit ARGF.read.tr('^[]','').tap{|x|0while x.gsub!('[]','')}.size>0

can't use size alone because it would give false negatives (!!!) when the total number of unbalanced brackets is multiple of 256

ruby (64)

exit $<.read.tr('^[]','').tap{|x|0while x.gsub!('[]','')}.empty?

previously (68) it was:

exit ARGF.read.tr('^[]','').tap{|x| 0 while x.gsub!('[]','')}.empty?

Another equivalent solution uses

exit $<.read.tr('^[]','').tap{|x|0while x.gsub!('[]','')}.size>0

can't use size alone because it would give false negatives (!!!) when the total number of unbalanced brackets is multiple of 256

ruby (66)

exit ARGF.read.tr('^[]','').tap{|x|0while x.gsub!('[]','')}.empty?

previously (68) it was:

exit ARGF.read.tr('^[]','').tap{|x| 0 while x.gsub!('[]','')}.empty?

ruby (66)

exit ARGF.read.tr('^[]','').tap{|x|0while x.gsub!('[]','')}.empty?

previously (68) it was:

exit ARGF.read.tr('^[]','').tap{|x| 0 while x.gsub!('[]','')}.empty?

Another equivalent solution uses

exit ARGF.read.tr('^[]','').tap{|x|0while x.gsub!('[]','')}.size>0

can't use size alone because it would give false negatives (!!!) when the total number of unbalanced brackets is multiple of 256

ruby (68)

exit ARGF.read.tr('^[]','').tap{|x| 0 while x.gsub!('[]','')}.empty?

ruby (66)

exit ARGF.read.tr('^[]','').tap{|x|0while x.gsub!('[]','')}.empty?

previously (68) it was:

exit ARGF.read.tr('^[]','').tap{|x| 0 while x.gsub!('[]','')}.empty?