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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.     $list[] = rtrim($line, "\r\n");
  11. }
  12.  
  13. $result = [];
  14.  
  15. foreach ($list as $item) {
  16.     $res = IsItsCharsAppearsTwice($item);
  17.     if ($res) {
  18.         $result[] = $res;
  19.     }
  20. }
  21.  
  22. foreach ($result as $word) {
  23.     echo $word, PHP_EOL;
  24. }
  25.  
  26. function IsItsCharsAppearsTwice($word)
  27. {
  28.     $map = [];
  29.     $len = strlen($word);
  30.  
  31.     for ($i = 0; $i < $len; $i++) {
  32.         $char = $word[$i];
  33.         $map[$char] = ($map[$char] ?? 0) + 1;
  34.     }
  35.  
  36.     foreach ($map as $char => $count) {
  37.         if ($count == 2) {
  38.             return $word;
  39.         }
  40.     }
  41.     return null;
  42. }
Success #stdin #stdout 0.03s 25372KB
comments (?)
stdin
copy 
asdf
fdas
asds
d fm
dfaa
aaaa
aabb
aaabb
stdout
copy 
asds
dfaa
aabb
aaabb
https://ideone.com/o0sS2l
language:
PHP (php 7.3.5)
created:
3 days ago
visibility:
public

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