If you are trying to solve some old problem in problemset (ex: 196A - Лексикографически максимальная подпоследовательность) if you look at the "Attention" bar at the right you can clearly see the typo in the text... It says "than" instead of "then".

void obvious_sarcasm() {
    string dank_meme = "BEST PROGRAMMING SITE 0/10 WOULD NOT CODE AGAIN - Metacritic."
}

On a more serious note, please add search of problems by tags. pweese?