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<?php function bigSum(string $a, string $b): string { $a_arr = array_reverse(str_split($a)); $b_arr = array_reverse(str_split($b)); $res = []; $l = max(count($a_arr), count($b_arr)); echo $l; print_r($a_arr); print_r($b_arr); for ($c=0; $c<$l; $c++) { $r = $a_arr[$c] ?? 0 + $b_arr[$c] ?? 0; if ($r < 10) $res[] = (string)$r; } print_r($res); return ''; } echo bigSum('1000000000000000000000000000001','465');
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