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subsequence-ajax.php
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subsequence-ajax.php
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<?php
$x = str_split($_POST['x']);
$y = str_split($_POST['y']);
function subsequence($x, $y)
{
// pego quantidade de letras de cada array
$m = count($x);
$n = count($y);
//inicializo os arrays de resultado
$c = array();
$b = array();
// incializo o array C
for($i=1; $i<=$m; $i++) $c[$i][0] = 0;
for($j=1; $j<=$n; $j++) $c[0][$j] = 0;
for($i=1; $i<=$m; $i++)
{
for($j=1; $j<=$n; $j++)
{
if($x[$i] == $y[$j]){
$c[$i][$j] = $c[$i-1][$j-1] + 1;
$b[$i][$j] = "\\";
}
elseif($c[$i-1][$j] >= $c[$i][$j-1]){
$c[$i][$j] = $c[$i-1][$j];
$b[$i][$j] = "|";
}
else{
$c[$i][$j] = $c[$i][$j-1];
$b[$i][$j] = "<-";
}
}
}
$result = array();
array_push($result, $c);
array_push($result, $b);
# Exibe tabela de setas
/*echo "<table class='table table-hover'>";
echo "<thead>";
echo "<tr>";
echo "<th> </th>";
echo "<th>y[j]</th>";
for($i=0; $i<=count($y); $i++){
echo "<th>";
echo $y[$i];
echo "</th>";
}
echo "</tr>";
echo "</thead>";
echo "<tbody>";
for($f=0; $f<=count($x); $f++){
echo "<tr>";
if($f == 0) echo "<th>x[i]</th>";
else{
echo "<th>";
echo $x[$f - 1];
echo "</th>";
}
for($j=0; $j<count($b[$i]); $j++)
{
echo "<th>";
echo $c[$f][$j]." ".$b[$f][$j];
echo "</th>";
}
echo "</tr>";
}
echo "</tbody>";
echo "</table><hr>";*/
return $result;
}
function printLCS($b, $x, $i, $j)
{
if($i == 0 || $j == 0) return;
if($b[$i][$j] == "\\"){
printLCS($b, $x, $i-1, $j-1);
echo $x[$i];
}
elseif($b[$i][$j] == "|") printLCS($b, $x, $i-1, $j);
else printLCS($b, $x, $i, $j-1);
}
$result = subsequence($x, $y);
echo "A maior sequência comum encontrada é: <b>";
printLCS($result[1], $x, count($x), count($y)); echo "</b>";
?>