The problem is pretty stupid, if there's only one test case. Then you can just return the correct result for this test case, without really computing anything (which is what the "best" solution to this problem does.
Determine if a Given Number is a Triangle Number
Divisible by 2
A quadrant matrix
Create a matrix X, where each column is a shifted copy of the vector v
Matrix which contains the values of an other matrix A at the given locations.
Matrix with different incremental runs
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