Estimate a using inverse matrix calculation. This is principle of linear regression.
As a friendly reminder, we can see the test suite, so it makes the problem more challenging if the solution is not explicitly in the test suite.
The Test Suite needs to allow for floating-point errors in all test cases, as demonstrated in Solution 1575603. (Refer to Problem 44690.) Also, there should be at least four test cases for every problem.
Extract leading non-zero digit
Factorize THIS, buddy
Duplicate a character
Compare two input matrices
Interpolate scattered data.
Calculate area of sector
Weighted moving average
Change string to number
Change matrix to vector
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