First test case is invalid. Please fix it.
I have fixed it.
and the fourth...
It must be OK now!
Getting the row and column location from a matrix
Is it a number?
Natural numbers in string form
Area of a triangle
Get Next Combination
Modular multiplicative inverse
Cryptography with A Square Matrix : Encoding
Hexagonal numbers on a spiral matrix
Find two triangular numbers whose sum is input.
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