题目：

题解：

func maxPoints(points [][]int) (ans int) {n := len(points)if n <= 2 {return n}for i, p := range points {if ans >= n-i || ans > n/2 {break}cnt := map[int]int{}for _, q := range points[i+1:] {x, y := p[0]-q[0], p[1]-q[1]if x == 0 {y = 1} else if y == 0 {x = 1} else {if y < 0 {x, y = -x, -y}g := gcd(abs(x), abs(y))x /= gy /= g}cnt[y+x*20001]++}for _, c := range cnt {ans = max(ans, c+1)}}return
}func gcd(a, b int) int {for a != 0 {a, b = b%a, a}return b
}func abs(x int) int {if x < 0 {return -x}return x
}func max(a, b int) int {if a > b {return a}return b
}