* $1 ≤ N ≤ 100$
* $N ≤ M-1$
* $1 ≤ M{~i,j~} ≤ 10000 (1 ≤ i,j ≤ M)$

* $1 ≤ P{~i,j~} ≤ 10000 (1 ≤ i,j ≤ N)$

h2. Exemplu
table(example). |_. tetris2.in |_. tetris2.out |

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|6
 3 2 3 2 3 2
 2 1 2 1 2 4
 2 1 2 2 2 1
 2 1 1 2 1 1
 2 1 1 2 1 1
 3 1 2 1 2 1
 3
 1 2 1
 2 3 2
 2 2 2
|1

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h3. Explicatie

...

Piesa poate fi pozitionata perfect doar in pozitia $(1,3)$.

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