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- #!/usr/bin/ruby
- #
- ## https://rosettacode.org/wiki/24_game/Solve
- #
- var formats = [
- '((%d %s %d) %s %d) %s %d',
- '(%d %s (%d %s %d)) %s %d',
- '(%d %s %d) %s (%d %s %d)',
- '%d %s ((%d %s %d) %s %d)',
- '%d %s (%d %s (%d %s %d))',
- ];
- var op = %w( + - * / );
- var operators = op.map { |a| op.map {|b| op.map {|c| "#{a} #{b} #{c}" } } }.flatten;
- loop {
- var input = Sys.scanln("Enter four integers or 'q' to exit: ") \\ break;
- input == 'q' && break;
- input ~~ /^\h*[1-9]\h+[1-9]\h+[1-9]\h+[1-9]\h*$/ || (
- say "Invalid input!"; next;
- );
- var n = input.split.map{.to_i};
- var numbers = n.permutations;
- formats.each { |format|
- numbers.each { |n|
- operators.each { |operator|
- var o = operator.split;
- var str = (format % (n[0],o[0],n[1],o[1],n[2],o[2],n[3]));
- Sidef.new.execute_code(str) == 24 && say str;
- }
- }
- }
- }
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