Overlapping Disks

Overlapping Disks

Simple+

给定在二维平面上以图元表示的disks 的列表 (x, y, r)使x, y圆心点r 为该圆盘的半径,请计算有多少对圆盘相交

两个圆盘 (x1, y1, r1)(x2, y2, r2)相交,当且仅当它们满足毕达哥拉斯不等式(x2-x1)**2+(y2-y1)**2<=(r1+r2)**2 时。

请注意,只要参数是整数,这个精确的公式就能在纯粹的整数运算中运行,因此没有平方根或任何其他无理数的小数噪音。(该公式还使用运算符<= 将两个接吻盘视为相交的一对)。

对于这个问题,简单地循环所有可能的磁盘对是可行的,但对于大型列表来说,效率会变得非常低。然而,sweep line algorithm 不仅能有效地解决这个问题,而且还能高效地解决这个问题(这是一个至关重要但经常被忽视的 "效率 "区别),因为它只需查看少得多的磁盘对。

下面是一个 [(0, 0, 3), (6, 0, 3), (6, 6, 3), (0, 6, 3)]:

example

输入: 列表 (List)元组 (tuple)的整数 (int).

输出:整数 (int).

示例

assert overlapping_disks([(0, 0, 3), (6, 0, 3), (6, 6, 3), (0, 6, 3)]) == 4
assert overlapping_disks([(4, -1, 3), (-3, 3, 2), (-3, 4, 2), (3, 1, 4)]) == 2
assert (
    overlapping_disks([(-10, 6, 2), (6, -4, 5), (6, 3, 5), (-9, -8, 1), (1, -5, 3)])
    == 2
)
assert (
    overlapping_disks(
        [
            (2, 2, 1),
            (3, 3, 1),
            (4, 4, 2),
            (5, 5, 2),
            (6, 6, 3),
            (7, 7, 3),
            (8, 8, 4),
            (9, 9, 4),
            (10, 10, 5),
       ...
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