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Euclidean distance from 0

For your second function, you will compute the distance from 0 to a point in a 2D space.

Unless otherwise noted, assume that Rcpp is loaded in your workspace.

说明

100 XP

Write a C++ function euclidean_distance() that takes two arguments x and y (both double) and returns another double that is the euclidian distance between (0, 0) and (x, y) points.