Лимит времени 2000/4000/4000/4000 мс. Лимит памяти 65000/65000/65000/65000 Кб.
Prepared by Ibrahim Mesecan.
Сложность Бета
Sum of kth Anti-diagonal
Question:
Antidiagonal of a matrix starts from the lower left corner
and goes to the upper right corner.
You are given an nXn square matrix. Find the sum of
kth anti-diagonal. The third anti-diagonal starts
from the third row first element (6). And then,
every element is connected to its upper right
neigbour (first 9 and then 4).
Input specification
You will be given two integer numbers (n and k) at the
beginning where 1 ≤ n ≤ 100 and 1 ≤ k ≤ n.
Then, in the following n lines, you will be given n integers,
which are between 0 and 1000.
Output specification
Show just one number: the sum of kth diagonal.
Sample Input
5 4
7 6 4 1 5
5 9 7 8 7
6 7 8 7 5
8 8 0 4 10
7 5 0 2 0
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Sample Output
23
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Explanation:
8+7+7+1=23
Для отправки решений необходимо выполнить вход.
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