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  1. <?php
  2.  
  3. /*Given data*/
  4. $amount = 6600;
  5.  
  6. $bills = array(
  7. 	100 	=> 0,
  8. 	200		=> 3,
  9. 	500 	=> 1,
  10. 	1000	=> 0,
  11. 	2000 	=> 4,
  12. 	5000 	=> 1
  13. );
  14.  
  15. /*Calculate resulting greenbacks*/
  16. function countResult($amount, $arr) 
  17. {
  18. 	$greenback	= array_reverse(array_keys($arr));
  19. 	$result 	= array(); 
  20. 	foreach ($greenback as $item) {
  21. 		$count	= 0;
  22. 		$res 	= 0;
  23. 		while ($count < $arr[$item] && $res <= $amount) {
  24. 			$res	+= $item; 
  25. 			$count	= $res / $item - 1;
  26. 		}
  27. 		$result[$item] = $count;	
  28. 		$amount = $amount - $item * $count;
  29. 	}
  30. 	return array_filter( $result ); # remove values equal to 0
  31. }
  32.  
  33. /*Check for undefined possibilities*/
  34. function checker($amount, $arr) 
  35. {
  36. 	$availableSum = 0;
  37. 	foreach ($arr as $greenback => $count) {
  38. 		$availableSum += $greenback * $count;
  39. 	}
  40. 	$errorMsg = "";
  41. 	if ($amount < 0) {
  42. 		$errorMsg .= "сумма меньше нуля (0)";
  43. 	} elseif ($amount % 100 !== 0 ) {
  44. 		$errorMsg .= "сумма не кратна ста (100)";
  45. 	} elseif ($amount > $availableSum) {
  46. 		$errorMsg .= "в банкомате недостаточно купюр";
  47. 	} else {
  48. 		$errorMsg  = null;
  49. 	}
  50. 	return $errorMsg;
  51. }
  52.  
  53.  
  54. /*View results*/
  55. function viewer($amount, $arr) 
  56. {
  57. 	print "Сумма: $amount"; 
  58. 	print "\n";
  59. 	if (checker($amount, $arr) !== null) {
  60. 		print "Выдача невозможна:" . checker($amount, $arr);
  61. 		} else {
  62. 		print "Выдача возможна, число купюр:";
  63. 		print "\n";
  64. 		foreach (countResult($amount, $arr) as $key => $val) {
  65. 			print $key . "x" . $val . "\t";	
  66. 		}		
  67. 	}
  68. }
  69.  
  70. /*Testing*/
  71. viewer($amount, $bills);
Success #stdin #stdout 0.01s 20568KB
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stdin
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Standard input is empty
stdout
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Сумма: 6600
Выдача возможна, число купюр:
5000x1	500x1	200x3
https://ideone.com/LmdcBD
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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