$v)$ret[$j][] = $v;return $ret;} } function int(){return intval(trim(fgets(STDIN)));} function chmax(&$a,$b){if($a<$b){$a=$b;return 1;}return 0;} function chmin(&$a,$b){if($a>$b){$a=$b;return 1;}return 0;} function isqrt($n):int{$res=intval(sqrt($n))+1;while($res*$res>$n)$res--;return $res;} function popcount($x){$c=0;while($x){$x&=$x-1;++$c;}return$c;} function swap(&$a,&$b){$tmp=$a;$a=$b;$b=$tmp;} function o(...$val){ if(count($val)==1)$val=array_shift($val); echo debug_backtrace()[0]['line'].")"; if(is_array($val)){ if(count($val) == 0)echo "empty array\n"; elseif(!is_array(current($val)))echo "array: ",implode(" ", addIndex($val)),"\n"; else{ echo "array:array\n"; if(isCleanArray($val))foreach($val as $row)echo implode(" ", addIndex($row)),"\n"; else foreach($val as $i => $row)echo "[".$i."] ".implode(" ", addIndex($row)),"\n"; } }else echo $val."\n"; } function addIndex($val){if(!isCleanArray($val)){$val = array_map(function($k, $v){return $k.":".$v;}, array_keys($val), $val);}return $val;} function isCleanArray($array){$clean=true;$i = 0;foreach($array as $k=>$v){if($k != $i++)$clean = false;}return $clean;} // 座圧対象の配列 -> [圧縮された配列,復元用のMap,圧縮用のMap] function atsu($array){$a = array_flip($array);$fuku=array_flip($a);sort($fuku);$atsu = array_flip($fuku);foreach($array as $i=>$val)$array[$i]=$atsu[$val];return [$array, $fuku, $atsu];} function atsu1($array){$a=array_flip($array);$fuku=array_flip($a);sort($fuku);array_unshift($fuku,0);array_unshift($fuku,0);unset($fuku[0]);$atsu=array_flip($fuku);foreach($array as $i=>$val)$array[$i]=$atsu[$val];return [$array, $fuku, $atsu];} function median($a){sort($a);$n=count($a);return $n%2?$a[($n-1)/2]:($a[$n/2-1]+$a[$n/2])/2;} function gcdAll($array){$gcd=$array[0];for($i=1,$I=count($array);$i<$I;++$i){$gcd=gcd($gcd,$array[$i]);}return $gcd;} function gcd($m, $n){if(!$n)return $m;return gcd($n, $m % $n);} function lcmAll($array){$lcm=$array[0];for($i=1,$I=count($array);$i<$I;++$i){$lcm=lcm($lcm,$array[$i]);}return $lcm;} function lcm($a, $b) {return $a / gcd($a, $b) * $b;} function loadTree($N = false){ if($N === false)$N = $GLOBALS['N']; return loadGraph($N, $N-1); } function loadGraph($N = false, $M = false, $both = true){ if($N === false)$N = $GLOBALS['N']; if($M === false)$M = $GLOBALS['M']; $G = array_fill(1, $N, []); for($i = 0; $i < $M; $i++){ $values = ints(); if(count($values) == 2){ list($a, $b) = $values; if($both == 0){ $G[$a][] = $b; }elseif($both == 1){ $G[$a][] = $b; $G[$b][] = $a; }else{ $G[$b][] = $a; } }else{ list($a, $b, $d) = $values; if($both == 0){ $G[$a][] = [$b, $d]; }elseif($both == 1){ $G[$a][] = [$b, $d]; $G[$b][] = [$a, $d]; }else{ $G[$b][] = [$a, $d]; } } } return $G; }