# 1453. Maximum Number of Darts Inside of a Circular Dartboard

## Description

Alice is throwing `n`

darts on a very large wall. You are given an array `darts`

where `darts[i] = [x`

is the position of the _{i}, y_{i}]`i`

dart that Alice threw on the wall.^{th}

Bob knows the positions of the `n`

darts on the wall. He wants to place a dartboard of radius `r`

on the wall so that the maximum number of darts that Alice throws lie on the dartboard.

Given the integer `r`

, return *the maximum number of darts that can lie on the dartboard*.

**Example 1:**

Input:darts = [[-2,0],[2,0],[0,2],[0,-2]], r = 2Output:4Explanation:Circle dartboard with center in (0,0) and radius = 2 contain all points.

**Example 2:**

Input:darts = [[-3,0],[3,0],[2,6],[5,4],[0,9],[7,8]], r = 5Output:5Explanation:Circle dartboard with center in (0,4) and radius = 5 contain all points except the point (7,8).

**Constraints:**

`1 <= darts.length <= 100`

`darts[i].length == 2`

`-10`

^{4}<= x_{i}, y_{i}<= 10^{4}- All the
`darts`

are unique `1 <= r <= 5000`