Hacker Rank Challenge

HackerRankAnswer.php

<-- Sock Merchant Start -->
<?php
    function sockMerchant($n, $ar) {
        return array_sum(array_map(function ($n) {
            return intval($n / 2);
        }, array_count_values($ar)));
    }

    $fptr = fopen(getenv("OUTPUT_PATH"), "w");
    $stdin = fopen("php://stdin", "r");

    fscanf($stdin, "%d\n", $n);
    fscanf($stdin, "%[^\n]", $ar_temp);

    $ar = array_map('intval', preg_split('/ /', $ar_temp, -1, PREG_SPLIT_NO_EMPTY));
    $result = sockMerchant($n, $ar);

    fwrite($fptr, $result . "\n");

    fclose($stdin);
    fclose($fptr);
?>
<-- Sock Merchant End -->


<-- Counting Valleys Start -->
<?php
  function countingValleys($n, $s) {
      $count = $seaLevel = 0;
      for ($i = 0; $i < $n; $i++) {
          if ($s[$i] === 'U') {
              ++$seaLevel;
              if ($seaLevel === 0) {
                  ++$count;
              }
          } else {
              --$seaLevel;
          }
      }
      return $count;
  }
  
  $fptr  = fopen(getenv("OUTPUT_PATH"), "w");
  $stdin = fopen("php://stdin", "r");

  fscanf($stdin, "%d\n", $n);
  
  $s = '';
  fscanf($stdin, "%[^\n]", $s);
  $result = countingValleys($n, $s);
  fwrite($fptr, $result . "\n");
  
  fclose($stdin);
  fclose($fptr);
?>
<-- Counting Valleys End -->


<-- Jumping on The Clouds Start -->
<?php
  $handle = fopen ("php://stdin","r");
  fscanf($handle,"%d",$n);
  
  $c_temp = fgets($handle);
  $c      = explode(" ",$c_temp);
  array_walk($c,'intval');
  
  $res = 0;
  for ($i = 0; $i < ($n-1);) {
      if ($c[$i+2] == 1) {
          $res++; $i++;
      } else { $res++; $i+=2; }
  }
  
  echo $res."\n";
?>
<-- Jumping on The Clouds End -->


<-- Repeated Start -->
<?php
  $handle = fopen ("php://stdin","r");
  fscanf($handle,"%s",$s);
  fscanf($handle,"%ld",$n); $cnt = 0;
  
  for ($i = 0;$i<strlen($s);$i++) if ($s[$i] == 'a') $cnt++;
  $p  = floor($n / strlen($s));
  $p *= $cnt;
  if ($n%strlen($s)) {
      $r = $n % strlen($s);
      for ($i = 0; $i < $r; $i++) if ($s[$i] == 'a') $p++;
  }
  
  echo $p;
?>
<-- Repeated End -->