Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Question by Ibrahim Mesecan.
Sum of kth Diagonal
Question:
Diagonal of a matrix starts from upper left corner
and goes to the lower right corner.
You are given an nXn square matrix. Find the sum of
kth diagonal. For example, the third diagonal starts
from the third row first element (4). And then,
every element is connected to its lower right
neigbour (13 and then 4) until it reaches to the
border of the square.
Input specification
You will be given two integer numbers (n and k) at the
beginning where 1 ≤ n ≤ 100 and 1 ≤ k ≤ 2*n-1.
Then, in the following n lines, you will be given n integers,
which are between 0 and 1000.
Output specification
Show just one number: sum of kth diagonal.
Sample Input
5 6
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
30
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Explanation:
6+7+7+10=30
Для отправки решений необходимо выполнить вход.
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