* $2 ≤ N ≤ 200,000$
* $2 ≤ K ≤ N$

h2. Subtaskuri

h2. Subtaskuri:

* *Testele vor fi punctate individual.*
* Subtask 1 (30%): $N ≤ 10,000$
* Subtask 2 (40%): $N ≤ 100,000$
* Subtask 3 (30%): $Limite initiale.$

h2. Exemplu

h2. Exemplu si explicatie:

table(example). |_. frequent.in |_. frequent.out |_. Explicatie |
| 6

_ma_ apare in cinci dintre siruri.
_a_ apare in toate sirurile |

h3. Explicaţie
 
...
 

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