For given input matrix a, rotate it by 90 degrees and find the sum of the diagonals.
1 2 3 4
5 6 7 8
8 10 12 -2
-1 -3 -5 -7
Project Euler: Problem 10, Sum of Primes
find radius of cone
Create a Matrix of Zeros
Sum the rows
Check if there are white spaces in the input string
convert the number to binary format & count digits
Repetition of matrices
Calculating the total earnings of a factory
Product of all elements in an array
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