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1018-binary-prefix-divisible-by-5.php
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1018-binary-prefix-divisible-by-5.php
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<?php
// 1018. Binary Prefix Divisible By 5
// https://leetcode.com/problems/binary-prefix-divisible-by-5/
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Runtime: 40 ms, faster than 100.00% of PHP online submissions
// for Binary Prefix Divisible By 5.
// Memory Usage: 18.9 MB, less than 100.00% of PHP online submissions
// for Binary Prefix Divisible By 5.
// class Solution
// {
// /**
// * @param Integer[] $A
// * @return Boolean[]
// */
// function prefixesDivBy5($A)
// {
// $result = [];
// for ($i = 0, $s = ''; $i < count($A); $i++) {
// $s .= $A[$i];
// if (0 === bindec($s) % 5) {
// array_push($result, true);
// $s = '';
// } else {
// array_push($result, false);
// }
// }
// return $result;
// }
// }
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Runtime: 32 ms, faster than 100.00% of PHP online submissions
// for Binary Prefix Divisible By 5.
// Memory Usage: 18.6 MB, less than 100.00% of PHP online submissions
// for Binary Prefix Divisible By 5.
// class Solution
// {
// /**
// * @param Integer[] $A
// * @return Boolean[]
// */
// function prefixesDivBy5($A)
// {
// list($result, $curr) = [[], 0];
// foreach ($A as $digit) {
// $curr = ($curr * 2 + $digit) % 5;
// array_push($result, !$curr);
// }
// return $result;
// }
// }
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Runtime: 36 ms, faster than 100.00% of PHP online submissions
// for Binary Prefix Divisible By 5.
// Memory Usage: 18.4 MB, less than 100.00% of PHP online submissions
// for Binary Prefix Divisible By 5.
// class Solution
// {
// /**
// * @param Integer[] $A
// * @return Boolean[]
// */
// function prefixesDivBy5($A, $acc = 0)
// {
// return array_map(function ($digit) use (&$acc) {
// $acc = ($acc * 2 + $digit) % 5;
// return !$acc;
// }, $A);
// }
// }
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Runtime: 32 ms, faster than 100.00% of PHP online submissions
// for Binary Prefix Divisible By 5.
// Memory Usage: 18.3 MB, less than 100.00% of PHP online submissions
// for Binary Prefix Divisible By 5.
class Solution
{
/**
* @param Integer[] $A
* @param Integer $acc
* @return Boolean[]
*/
function prefixesDivBy5($A, $acc = 0)
{
return array_map(function ($digit) use (&$acc) {
return !($acc = ($acc * 2 + $digit) % 5);
}, $A);
}
}
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
$tests = [
[
'input' => [0, 1, 1],
'expected' => [true, false, false],
],
[
'input' => [1, 1, 1],
'expected' => [false, false, false],
],
[
'input' => [0, 1, 1, 1, 1, 1],
'expected' => [true, false, false, false, true, false],
],
[
'input' => [1, 1, 1, 0, 1],
'expected' => [false, false, false, false, false],
],
[
'input' => [1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1],
'expected' => [
false,
false,
true,
true,
true,
true,
true,
true,
true,
true,
true,
false,
false,
false,
false,
false,
false,
false,
false,
false,
],
],
[
'input' => [1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1],
'expected' => [
false,
false,
true,
true,
true,
true,
true,
true,
true,
true,
true,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
],
],
[
'input' => [
1,
0,
1,
0,
0,
0,
0,
0,
0,
0,
0,
1,
1,
1,
0,
0,
1,
0,
1,
1,
1,
1,
1,
1,
0,
0,
0,
1,
0,
1,
1,
1,
1,
0,
1,
1,
0,
1,
0,
1,
0,
0,
0,
1,
0,
0,
0,
0,
0,
1,
0,
0,
1,
1,
0,
0,
1,
1,
1,
],
'expected' => [
false,
false,
true,
true,
true,
true,
true,
true,
true,
true,
true,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
true,
true,
false,
false,
false,
true,
true,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
false,
true,
true,
true,
false,
false,
false,
],
],
];
$s = new Solution();
foreach ($tests as $test) {
extract($test);
$output = $s->prefixesDivBy5($input);
$stringifiedInput = json_encode($input);
$stringifiedExpected = json_encode($expected);
$stringifiedOutput = json_encode($output);
if ($expected === $output) {
echo "✅ {$stringifiedInput}<br>";
} else {
echo "🔴 {$stringifiedInput}<br>";
echo '<i>Expected the below</i><br>';
echo "<b>{$stringifiedExpected}</b><br>";
echo '<i>But got the below</i><br>';
echo "<b>{$stringifiedOutput}</b><br>";
}
echo '<hr>';
}