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  1. <?php
  2.  
  3. $arr1 = [1, 2, 3, 4];
  4. $arr2 = [3, 2, 2, 1, 0, 6, 1];
  5. $arr3 = [1, 3, 2, 1, 5, 4, 1];
  6.  
  7. function fun($arr, $acc = 0) {
  8.   if(max($arr) == null) {
  9.      return $acc;
  10.  
  11.   }  else {
  12.     $acc = $acc + max($arr);
  13.     $key = array_search(max($arr), $arr);
  14.     if ($key === 0) {
  15.         $arr[$key] = null;
  16.         $arr[$key + 1] = null;
  17.         return fun($arr, $acc);
  18.  
  19.     } elseif ($key === (count($arr) - 1)) {
  20.       $arr[$key] = null;
  21.       $arr[$key - 1] = null;
  22.       return fun($arr, $acc);
  23.  
  24.     } else {
  25.       $arr[$key] = null;
  26.       $arr[$key + 1] = null;
  27.       $arr[$key - 1] = null;
  28.       return fun($arr, $acc);
  29.  
  30.     }
  31.   }
  32. }
  33.  
  34. function rob($ar){
  35.   return fun($ar);
  36. }
  37.  
  38.  
  39.  
  40. echo rob($arr1)."\n";
  41. echo rob($arr2)."\n";
  42. echo rob($arr3)."\n";
Success #stdin #stdout 0.02s 52432KB
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https://ideone.com/pGF4Hx
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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