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<?php $n = 5; $str = "-1 -14 5 -61 -2"; $e = ""; $m = "-"; for($i = 0, $len = strlen($str); $i < $len; $i++) { if(is_numeric($str[$i])) { $result[] = $e . $str[$i]; } else { if($m == $str[$i]) { $e = $m; } else { $e = ""; } } } for($i = 0; $i < $n; $i++) { echo $result[$i] . "\n"; }

preferences:
57.66 ms | 402 KiB | 5 Q