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<?php
declare(strict_types=1);
namespace leetcode;
class FixedPoint
{
public static function fixedPoint(array $nums): int
if (empty($nums)) {
return 0;
}
foreach ($nums as $key => $val) {
if ($key === $val) {
return $key;
return -1;
public static function fixedPoint2(array $nums): int
[$low, $high] = [0, $nums[count($nums) - 1]];
while ($low <= $high) {
$mid = (int) ($low + ($high - $low) / 2);
if ($nums[$mid] === $mid) {
return $mid;
} elseif ($mid > $nums[$mid]) {
$low++;
} else {
$high--;
imajinyun /
leetcode-php
