This is simple problem based on problems 555, 801, 1118, etc.
Create an index vector from two input vectors.
input: [1 8 12] [4 5 9]
output: [1 2 3 4 8 7 6 5 12 11 10 9]
Finding Perfect Squares
Back to basics 23 - Triangular matrix
Matrix which contains the values of an other matrix A at the given locations.
intersection of matrices
Narcissistic number ?
Polite numbers. Politeness.
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