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  1. use Memoize;
  2. memoize('fib2');
  3.  
  4. print "Memoization is fun!\n";
  5.  
  6. sub fib1 {
  7.     print "Called fib1($_[0])\n";
  8.     my $n = $_[0];
  9.     if ($n <= 0) {
  10.             return 0;
  11.     }
  12.     elsif ($n == 1) {
  13.             return 1;
  14.     }
  15.     else {
  16.             return fib1($n-1) + fib1($n-2);
  17.     }
  18. }
  19. print fib1(5), "\n";
  20.  
  21. sub fib2 {
  22.     print "Called fib2($_[0])\n";
  23.     my $n = $_[0];
  24.     if ($n <= 0) {
  25.             return 0;
  26.     }
  27.     elsif ($n == 1) {
  28.             return 1;
  29.     }
  30.     else {
  31.             return fib2($n-1) + fib2($n-2);
  32.     }
  33. }
  34. print fib2(30), "\n";
Success #stdin #stdout 0.02s 5628KB
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stdin
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Standard input is empty
stdout
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Memoization is fun!
Called fib1(5)
Called fib1(4)
Called fib1(3)
Called fib1(2)
Called fib1(1)
Called fib1(0)
Called fib1(1)
Called fib1(2)
Called fib1(1)
Called fib1(0)
Called fib1(3)
Called fib1(2)
Called fib1(1)
Called fib1(0)
Called fib1(1)
5
Called fib2(30)
Called fib2(29)
Called fib2(28)
Called fib2(27)
Called fib2(26)
Called fib2(25)
Called fib2(24)
Called fib2(23)
Called fib2(22)
Called fib2(21)
Called fib2(20)
Called fib2(19)
Called fib2(18)
Called fib2(17)
Called fib2(16)
Called fib2(15)
Called fib2(14)
Called fib2(13)
Called fib2(12)
Called fib2(11)
Called fib2(10)
Called fib2(9)
Called fib2(8)
Called fib2(7)
Called fib2(6)
Called fib2(5)
Called fib2(4)
Called fib2(3)
Called fib2(2)
Called fib2(1)
Called fib2(0)
832040
https://ideone.com/u5iVQa
language:
Perl (perl 5.28.1)
created:
6 years ago
visibility:
public

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