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  1. Prepare
  2. Algorithms
  3. Strings
  4. Alternating Characters
  5. Discussions

Alternating Characters

  • misterjesusingl1
     + 0 comments

    php

    function alternatingCharacters($s) {
    // Write your code here
    $stack = [];
    $deletions = 0;
    for ($i = 0; $i < strlen($s); $i++) {
        if (count($stack) === 0) {
            $stack[] = $s[$i];
        } else {
            $last = $stack[count($stack) - 1];
            if ($last === $s[$i]) {
                $deletions++;
            } else {
                $stack[] = $s[$i];
            }
        }
    }
    return $deletions;
}