Generate Random Point in a Circle LeetCode solution in C++

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class Solution {
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 public:
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  double r, x, y;
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  Solution(double radius, double x_center, double y_center) {
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    r = radius;
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    x = x_center;
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    y = y_center;
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  }
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  vector<double> randPoint() {
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    double x_r = ((double)rand() / RAND_MAX * (2 * r)) + (x - r);
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    double y_r = ((double)rand() / RAND_MAX * (2 * r)) + (y - r);
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    while (solve(x_r, y_r, x, y) >= r * r) {
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      x_r = ((double)rand() / RAND_MAX * (2 * r)) + (x - r);
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      y_r = ((double)rand() / RAND_MAX * (2 * r)) + (y - r);
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    }
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    return {x_r, y_r};
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  }
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  double solve(double x_r, double y_r, double x, double y) {
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    return (x - x_r) * (x - x_r) + (y - y_r) * (y - y_r);
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  }
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};