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  1. <?php
  2. header("Content-Type: text/plain; charset=utf-8");
  3. ?> 
  4. <?php
  5.  
  6. error_reporting(-1);
  7. mb_internal_encoding('utf-8');
  8.  
  9. function getPyramid($n)
  10. {
  11.     $x = 0;
  12.     $y = 0;
  13.     for ($i = 1; $y <= $n; $i++) {
  14.         $x += $i;
  15.         $y += $x;
  16.  
  17.     }
  18.     if ($n <= $y) {
  19.         $i -= 2;
  20.     }
  21.     return $i;
  22. }
  23.  
  24. echo getPyramid(84);
  25. echo "\n";
  26. echo getPyramid(3);
  27. echo "\n";
  28. echo getPyramid(5);
  29. echo "\n";
  30. echo getPyramid(14);
  31. echo "\n";
  32. echo getPyramid(23);
  33. echo "\n";
Success #stdin #stdout 0.01s 20520KB
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stdin 
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https://ideone.com/lARqgh
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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