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fix.php
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<?php
$input="([4*2]";
$length=strlen($input);
$bracket=[];
$bracket_index=0;
function error($message)
{
exit($message);
}
function getopen($character)
{
$characters=
[
'{'=>'}',
'['=>']',
'('=>')',
];
if(isset($characters[$character]))
{
return $characters[$character];
}
error("Unknown character!");
return;
// if($character === '{')
// {
// return '}';
// }
// else if($character === '[')
// {
// return ']';
// }
// else if($character === '(')
// {
// return ')';
// }
// else
// {
// error("Unknown character!");
// return;
// }
}
function getclose($character)
{
$characters=
[
'}'=>'{',
']'=>'[',
')'=>'(',
];
if(isset($characters[$character]))
{
return $characters[$character];
}
error("Unknown character!");
return;
// if($character === '}')
// {
// return '{';
// }
// else if($character === ']')
// {
// return '[';
// }
// else if($character === ')')
// {
// return '(';
// }
// else
// {
// error("Unknown character!");
// return;
// }
}
function close($character)
{
global $bracket;
global $bracket_index;
// print_r($bracket);
$character_open=getclose($character);
if(isset($bracket[$bracket_index-1]))
{
$get=$bracket[$bracket_index-1];
if($get === $character_open)
{
unset($bracket[$bracket_index-1]);
}
else
{
error("Wrong Input for close the '%character_open' character!");
}
}
}
function fix()
{
global $bracket;
global $input;
$count=count($bracket);
if($count === 0)
{
return true;
}
foreach($bracket as $index=>$character)
{
$character_close=getopen($character);
$input.=$character_close;
unset($bracket[$index]);
}
}
for($index=0;$index<$length;$index++)
{
$character=$input[$index];
/////////////////////////////////////////
if($character === '{')
{
$bracket[$bracket_index]=$character;
$bracket_index++;
}
else if($character === '(')
{
$bracket[$bracket_index]=$character;
$bracket_index++;
}
else if($character === '[')
{
$bracket[$bracket_index]=$character;
$bracket_index++;
}
/////////////////////////////////////////
else if($character === '}')
{
close($character);
}
else if($character === ')')
{
close($character);
}
else if($character === ']')
{
close($character);
}
/////////////////////////////////////////
// print $character."\n";
}
fix();
// print_r($bracket);
echo($input);