Spookily similar to Problem 381 ("Angle between two vectors")....
Find the sum of all the numbers of the input vector
Summing Digits within Text
Back to basics 5 - Clipboard
Sum of diagonal of a square matrix
Sum the numbers on the main diagonal
Rubik's Cube: 30 Moves or Less : Cody Size
Pandiagonal Prime Magic Square Verification
Mastermind IV: Optimal Solver - max of 5 guesses
Map all the indices of an Array Indices into a Vector giving Index vs Row and Column
Chezz_000 : Simplified chess
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