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<?php
declare(strict_types=1);
namespace leetcode;
class RangeSumQueryImmutable
{
public static function sumRange(array $nums, int $start, int $end): int
$n = count($nums);
if ($n <= 0 || $start > $end || $start > $n || $end > $n) {
return 0;
}
$ans = 0;
for ($i = $start; $i <= $end; $i++) {
$ans += $nums[$i];
return $ans;
public static function sumRange2(array $nums, int $i, int $j)
if ($n <= 0 || $i > $j || $i > $n || $j > $n) {
$helper = static function (array $map) use ($n) {
for ($i = 1; $i < $n; $i++) {
$map[$i] += $map[$i - 1];
return $map;
};
$map = $helper($nums);
return $i === 0 ? $map[$j] : $map[$j] - $map[$i - 1];
imajinyun /
leetcode-php
