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<?php
declare(strict_types=1);
namespace leetcode;
class MonotonicArray
{
public static function isMonotonic(array $arr): bool
if (empty($arr)) {
return false;
}
$inc = $dec = true;
for ($i = 1, $n = count($arr); $i < $n; $i++) {
$inc &= $arr[$i - 1] <= $arr[$i];
$dec &= $arr[$i - 1] >= $arr[$i];
return $inc || $dec;
public static function isMonotonic2(array $arr): bool
for ($i = 0, $n = count($arr) - 1; $i < $n; $i++) {
if ($arr[$i] > $arr[$i + 1]) {
$inc = false;
if ($arr[$i] < $arr[$i + 1]) {
$dec = false;
if ($inc === false && $dec === false) {
return true;
imajinyun /
leetcode-php
