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<?php function removeRepeatedCharacters($key){ $removeNext = false; for($i = 0; $i < strlen($key); $i++){ if($key[$i] == $key[$i+1]){ $key[$i] = ' '; $removeNext = true; } else if($removeNext){ $key[$i] =' '; $removeNext= false; } } echo str_replace(' ','',$key); } removeRepeatedCharacters('aabcccdee');

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54.83 ms | 402 KiB | 5 Q