Solution.py

class Solution:
    def minimumLines(self, points: List[List[int]]) -> int:
        def check(i, j, k):
            x1, y1 = points[i]
            x2, y2 = points[j]
            x3, y3 = points[k]
            return (x2 - x1) * (y3 - y1) == (x3 - x1) * (y2 - y1)

        @cache
        def dfs(state):
            if state == (1 << n) - 1:
                return 0
            ans = inf
            for i in range(n):
                if not (state >> i & 1):
                    for j in range(i + 1, n):
                        nxt = state | 1 << i | 1 << j
                        for k in range(j + 1, n):
                            if not (nxt >> k & 1) and check(i, j, k):
                                nxt |= 1 << k
                        ans = min(ans, dfs(nxt) + 1)
                    if i == n - 1:
                        ans = min(ans, dfs(state | 1 << i) + 1)
            return ans

        n = len(points)
        return dfs(0)