PHP实现正负数数组最大子序列,要求给出数组,该数组由正负数字组成,找出该数组中连续元素组成的子数组的最大值。
这其实得算是个背包变种吧。
代码如下:
PHP
$list = array(1,-3,-5,-7,8,9,-11,5);
原文链接:https://www.f2er.com/php/24822.html$list = array(1,-3,-5,-7,8,9,-11,5);
$cur = 0;
$term = 0;
$res = 0;
$begin = 0;
foreach($list as $k => $v){
$cur += $v;
if($cur < 0){
$cur = 0;
$begin = $k + 1;
}
if($cur > $res){
$res = $cur;
$term = $k;
}
}
$max_seq = array_slice($list,$begin,($term - $begin) + 1);
echo $res . ',';
print_r($max_seq);
//17,Array ( [0] => 8 [1] => 9 )