// Find the coefficient for the high-order term in the running time, by minimizing the sum of squares of relative error, for the fitting curve given on the lambda expresion.
// Find the coefficient for the high-order term in the running time, by
// minimizing the sum of squares of relative error, for the fitting curve
// given by the lambda expresion.
// - n : Vector containing the size of the benchmark tests.
// - n : Vector containing the size of the benchmark tests.
// - time : Vector containing the times for the benchmark tests.
// - time : Vector containing the times for the benchmark tests.