Parse 32-bit Integer

Parse 32-bit Integer

Hard PHP PHP Error Handling 34 views
Explanation Complexity

Problem Statement

Given an integer as text, print it if it fits 32-bit signed, else print OVERFLOW.

Input Format

One token s.

Output Format

Integer or OVERFLOW.

Example

2147483648
OVERFLOW

Constraints

|s|

Input / Output Format

Input Format
One token s.
Output Format
Integer or OVERFLOW.
Constraints
|s|

Examples

Input:
2147483648
Output:
OVERFLOW

Example Solution (Public)

PHP 
<?php
$inputText=trim(stream_get_contents(STDIN));
if($inputText==='') exit;
if(!preg_match('/^[+-]?[0-9]+$/',$inputText)){ echo 'OVERFLOW'; exit; }
$neg=false;
if($inputText[0]==='-'){ $neg=true; $inputText=substr($inputText,1); }
elseif($inputText[0]==='+') $inputText=substr($inputText,1);
$inputText=ltrim($inputText,'0'); if($inputText==='') $inputText='0';
$limit=$neg ? '2147483648' : '2147483647';
if(strlen($inputText)<strlen($limit) || (strlen($inputText)===strlen($limit) && $inputText<=$limit)){
  $val=intval(($neg?'-':'').$inputText);
  echo strval($val);
}else echo 'OVERFLOW';
?>

Official Solution Code

<?php
$inputText=trim(stream_get_contents(STDIN));
if($inputText==='') exit;
if(!preg_match('/^[+-]?[0-9]+$/',$inputText)){ echo 'OVERFLOW'; exit; }
$neg=false;
if($inputText[0]==='-'){ $neg=true; $inputText=substr($inputText,1); }
elseif($inputText[0]==='+') $inputText=substr($inputText,1);
$inputText=ltrim($inputText,'0'); if($inputText==='') $inputText='0';
$limit=$neg ? '2147483648' : '2147483647';
if(strlen($inputText)<strlen($limit) || (strlen($inputText)===strlen($limit) && $inputText<=$limit)){
  $val=intval(($neg?'-':'').$inputText);
  echo strval($val);
}else echo 'OVERFLOW';
?>
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