#!/usr/bin/perl -l $_=pop;chop while print,s/.(?=(.))/chop($_=$&+$1)+$_/ge |
#!/usr/bin/perl -l $_=pop;chop while print,s/(.)(?=(.))/chop($_=$1+$2)+$_/ge |
#!/usr/bin/perl $_=shift;chop while(print"$_\n"),s/(.)(?=(.))/chop($_=$1+$2)+$_/ge |
#!/usr/bin/perl $_=shift;chop while((print"$_\n")&&s/(.)(?=(.))/chop($_=$1+$2)+$_/ge) |
#!/usr/bin/perl
$_=shift;while((print"$_\n")&&s/(.)(?=(.))/$b=$1+$2;chop($b)+$b/ge){chop}
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#!/usr/bin/perl
$_=shift;while((print"$_\n")&&s/(.)(?=(.))/$b=$1+$2;$b\%10+int($b\/10)/ge){chop}
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#!/usr/bin/perl
$a=shift;while((print$_=$a,"\n")&&/dd/){$a;while(s/^(.)(.)/$2/e){$b=$1+$2;$b=~s/(.)(.)/$1+$2/e;$a.=$b;}}
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#!/usr/bin/perl
$a=shift;while((print$_=$a,"\n")&&/../){$a="";while(s/^(.)(.)/$2/e){$b=$1+$2;$b=~s/(.)(.)/$1+$2/e;$a.=$b;}}
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#!/usr/bin/perl
$a=shift;while((print$_=$a,"\n")&&/dd/){$a="";while(s/^(.)(.)/$2/e){$b=$1+$2;$b=~s/(.)(.)/$1+$2/e;$a.=$b;}}
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#!/usr/bin/perl
$_=shift;while((print"$_\n")&&/dd/){$a="";while(s/^(d)(d)/$2/e){$b=$1+$2;$b=~s/^(d)(d)/$1+$2/e;$a.=$b}$_=$a}
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