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  1. <?php
  2.  
  3. if (php_sapi_name() !== 'cli') {
  4.     fwrite(STDERR, "Run this script from the terminal.\n");
  5.     exit(1);
  6. }
  7.  
  8. $list = [];
  9. while (($line = fgets(STDIN)) !== false) {
  10.     $item = rtrim($line, "\r\n");
  11.     if ($item === '') {
  12.         continue;
  13.     }
  14.     $list[] = $item;
  15. }
  16.  
  17. $result = [];
  18.  
  19. foreach ($list as $item) {
  20.     $res = IsItsCharsAppearsTwice($item);
  21.     if ($res) {
  22.         $result[] = $res;
  23.     }
  24. }
  25.  
  26. foreach ($result as $word) {
  27.     echo $word, PHP_EOL;
  28. }
  29.  
  30. function IsItsCharsAppearsTwice($word)
  31. {
  32.     $map = [];
  33.     $len = strlen($word);
  34.  
  35.     for ($i = 0; $i < $len; $i++) {
  36.         $char = $word[$i];
  37.         $map[$char] = ($map[$char] ?? 0) + 1;
  38.     }
  39.  
  40.     foreach ($map as $char => $count) {
  41.         if ($count == 2) {
  42.             return $word;
  43.         }
  44.     }
  45.     return null;
  46. }
  47.  
  48.  
Success #stdin #stdout 0.04s 25916KB
comments (?)
stdin
copy 
asdf
fdas
asds
d fm
dfaa
aaaa
aabb
aaabb
stdout
copy 
asds
dfaa
aabb
aaabb
https://ideone.com/ppoMYf
language:
PHP (php 7.3.5)
created:
3 days ago
visibility:
public

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