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tm.AnBn-2
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tm.AnBn-2
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#n
# Accepts tape: a{n}b{n}
# Example: echo 'aabb' | sed -rf tm.AnBn-2
# This source code is released under MIT License
# Copyright (c) 2016 Peter Cerman (https://github.com/pcerman)
/^>/ !s/^/>/
#---------------------------------------------------------------------
:S0
#---------------------------------------------------------------------
h;s/[^>]/ /g;s/>/_/;p;g;s/>//;p;g
/>a/ { s/>a/#>/;b S1 }
/>#/ { s/>#/#>/;b S4 }
/>$/ b S4
b error
#---------------------------------------------------------------------
:S1
#---------------------------------------------------------------------
h;s/[^>]/ /g;s/>/_/;p;g;s/>//;p;g
/>[ab]/ { s/>(.)/\1>/;b S1 }
/.>#/ { s/(.)>#/>\1#/;b S2 }
/.>$/ { s/(.)>/>\1/; b S2 }
b error
#---------------------------------------------------------------------
:S2
#---------------------------------------------------------------------
h;s/[^>]/ /g;s/>/_/;p;g;s/>//;p;g
/.>b/ { s/(.)>b/>\1#/;b S3 }
b error
#---------------------------------------------------------------------
:S3
#---------------------------------------------------------------------
h;s/[^>]/ /g;s/>/_/;p;g;s/>//;p;g
/.>[ab]/ { s/(.)>(.)/>\1\2/;b S3 }
/>#/ { s/>#/#>/;b S0 }
b error
#---------------------------------------------------------------------
:S4
#---------------------------------------------------------------------
h;s/[^>]/ /g;s/>/_/;p;g;s/>//;p;g
/>#/ { s/>#/#>/;b S5 }
/>$/ b halt
b error
#---------------------------------------------------------------------
:S5
#---------------------------------------------------------------------
h;s/[^>]/ /g;s/>/_/;p;g;s/>//;p;g
/>#/ { s/>#/#>/;b halt }
/>$/ b halt
b error
#---------------------------------------------------------------------
:break
s/^/BREAK: /
p
q 2
#---------------------------------------------------------------------
:error
i \
s/.*/NOT ACCEPTED/
p
q 1
#---------------------------------------------------------------------
:halt
h;s/[^>]/ /g;s/>/_/;p;g;s/>//;p;g
s/.*/ACCEPTED/
i \
p
q 0