php求正负数数组中连续元素最大值示例_php实例

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。

$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 $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 )