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<?php
declare(strict_types=1);
namespace leetcode;
class ExcelSheetColumnNumber
{
public static function titleToNumber(string $title): int
if (empty($title)) {
return 0;
}
[$ans, $n] = [0, strlen($title)];
for ($i = 0; $i < $n; $i++) {
$ans *= 26;
$ans += ord(strtoupper($title[$i])) - ord('A') + 1;
return $ans;
public static function titleToNumber2(string $title): int
[$ans, $map] = [0, []];
for ($i = 1; $i < 27; $i++) {
$map[strtoupper(chr($i + 65 - 1))] = $i;
for ($i = 0, $n = strlen($title); $i < $n; $i++) {
$ans = $ans * 26 + $map[strtoupper($title[$i])];
imajinyun /
leetcode-php
