36.pl

   1 #!/usr/bin/perl -w
   2
   3 use strict;
   4
   5 my $sum = 0;
   6 while (<>) {
   7         chomp;
   8         1 while
   9                 s/\((\d+)\)/$1/ ||
  10                 s/(\([^\(\)]*?)(\d+)\s*\+\s*(\d+)([^\(\)]*\))/$1.($2+$3).$4/e ||
  11                 s/(\([^\(\)]*?)(\d+)\s*\*\s*(\d+)([^\(\)]*\))/$1.($2*$3).$4/e ||
  12                 s/(\d+)\s*([\+])\s*(\d+)/"$1$2$3"/ee ||
  13                 s/(\d+)\s*([\*])\s*(\d+)/"$1$2$3"/ee;
  14         $sum += $_;
  15 }
  16 print "sum=$sum\n";