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2528.Maximize the Minimum Powered City.php
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2528.Maximize the Minimum Powered City.php
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class Solution {
/**
* @param Integer[] $stations
* @param Integer $r
* @param Integer $k
* @return Integer
*/
function maxPower($stations, $r, $k) {
$size = count($stations);
$power = $this->calcPower($stations, $r, $size);
print_r($power);
$left = min($power);
$right = $left + $k + 1;
while ($left < $right) {
$mid = intdiv($left + $right, 2);
if ($this->test($power, $size, $mid, $r, $k)) {
$left = $mid + 1;
} else {
$right = $mid;
}
}
return $left - 1;
}
private function test($power, $size, $bar, $r, $k) {
$drop = array();
$cur = 0;
for ($i = 0; $i < $size; $i++) {
$diff = $bar - $power[$i] - $cur;
if ($diff > 0) {
$k -= $diff;
if ($k < 0) {
return false;
}
$cur += $diff;
$drop[$i + $r * 2] = $diff;
}
if ($drop[$i]) {
$cur -= $drop[$i];
}
}
return true;
}
private function calcPower($stations, $r, $size) {
$power = array();
$cur = 0;
for ($i = 0; $i < min($r, $size); $i++) {
$cur += $stations[$i];
}
for ($i = 0; $i < $size; $i++) {
if ($i + $r < $size) {
$cur += $stations[$i + $r];
}
$power[$i] = $cur;
if ($i - $r >= 0) {
$cur -= $stations[$i - $r];
}
}
return $power;
}
}