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  1. <?php
  2.  
  3. /**
  4.  * Project Euler Problem 6: Sum square difference
  5.  * 
  6.  * The sum of the squares of the first ten natural numbers is,
  7.  * 
  8.  *		1² + 2² + ... + 10² = 385
  9.  * 
  10.  * The square of the sum of the first ten natural numbers is,
  11.  * 
  12.  *		(1 + 2 + ... + 10)² = 55² = 3025
  13.  * 
  14.  * Hence the difference between the sum of the squares of the first ten natural
  15.  * numbers and the square of the sum is 3025 − 385 = 2640.
  16.  * 
  17.  * Find the difference between the sum of the squares of the first one hundred
  18.  * natural numbers and the square of the sum.
  19.  * 
  20.  * Problem: https://p...content-available-to-author-only...r.net/problem=6
  21.  * Solution: https://g...content-available-to-author-only...b.com/potherca-blog/ProjectEuler/blob/master/src/PHP/Solutions/Problem006.php
  22.  * Live code: https://i...content-available-to-author-only...e.com/zgflJ5
  23.  */
  24. namespace Potherca\ProjectEuler\Solutions\Problem006
  25. {
  26.     use Potherca\ProjectEuler\Calculators\SumSquareDifferenceCalculator as Calculator;
  27.  
  28. 	$limit = 100;
  29.  
  30.     $solution = (new Calculator())->getSumSquareDifference($limit);
  31.  
  32.     echo $solution;
  33. }
  34.  
  35. namespace Potherca\ProjectEuler\Calculators
  36. {
  37.     class SumSquareDifferenceCalculator
  38.     {
  39.         final public function getSumSquareDifference(int $limit): int
  40.         {
  41.             $range = range(1, $limit);
  42.  
  43.             return $this->getSquareOfSums($range) - $this->getSumOfSquares($range);
  44.         }
  45.  
  46.         private function getSquareOfSums(array $range): int
  47.         {
  48.         	return array_sum($range) ** 2;
  49.         }
  50.  
  51.         private function getSumOfSquares(array $range): int
  52.         {
  53.         	return array_sum(
  54.         		array_map(function ($number) {
  55.         			return $number ** 2;
  56.         		}, $range)
  57.         	);
  58.         }
  59.     }
  60. }
  61.  
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https://ideone.com/zgflJ5
Solution in PHP for Project Euler Problem 006
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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