用java写一个frechet距离算法

以下是Java实现的Frechet距离算法：

public class FrechetDistance {
    public static double compute(double[][] P, double[][] Q) {
        int m = P.length;
        int n = Q.length;
        double[][] C = new double[m][n];

        for (int i = 0; i < m; i++) {
            for (int j = 0; j < n; j++) {
                double dist = distance(P[i], Q[j]);
                if (i == 0 && j == 0) {
                    C[i][j] = dist;
                } else if (i == 0) {
                    C[i][j] = Math.max(C[i][j - 1], dist);
                } else if (j == 0) {
                    C[i][j] = Math.max(C[i - 1][j], dist);
                } else {
                    C[i][j] = Math.max(Math.min(Math.min(C[i - 1][j], C[i][j - 1]), C[i - 1][j - 1]), dist);
                }
            }
        }

        return C[m - 1][n - 1];
    }

    private static double distance(double[] a, double[] b) {
        double dx = a[0] - b[0];
        double dy = a[1] - b[1];
        return Math.sqrt(dx * dx + dy * dy);
    }

    public static void main(String[] args) {
        double[][] P = {{1, 1}, {2, 2}, {3, 3}};
        double[][] Q = {{2, 2}, {3, 3}, {4, 4}};

        double dist = compute(P, Q);
        System.out.println("Frechet distance: " + dist);
    }
}

这个算法输入两个数组P和Q，每个数组包含一些二维点的坐标。输出是P和Q之间的Frechet距离。实现中使用了一个二维数组C来存储动态规划的中间结果。其中C[i][j]表示P的前i个点和Q的前j个点之间的Frechet距离。