leetcode-149-Max Points on a Line

darcrand 发布于2019-07-31 11:03 / 2004人阅读

"""
Given n points on a 2D plane,
find the maximum number of points that lie on the same straight line.

"""

from decimal import Decimal

# Definition for a point.
class Point:
    def __init__(self, a=0, b=0):
        self.x = a
        self.y = b

class Solution:
    def maxPoints(self, points):
        """
        :type points: List[Point]
        :rtype: int
        """
        if not points:
            return 0
        # xs=[point.x for point in points]
        # ys=[point.y for point in points]
        length=len(points)
        if length==1:
            return 1
        counter=0
        for ip in range(length-1):

            kdict={"i":1}
            same=0
            for jp in range(ip+1,length):
                if points[jp].x==points[ip].x and points[ip].y==points[jp].y:
                    same+=1
                elif points[jp].x==points[ip].x:
                    kdict["i"]+=1
                else:
                    k=Decimal(points[jp].y-points[ip].y*Decimal(1.0))/Decimal(points[jp].x-points[ip].x)
                    print(k)
                    if k not in kdict.keys():
                        kdict[k]=2
                    else:
                        kdict[k]+=1

            counter=max(counter,max(kdict.values())+same)
        # print(counter)
        return counter
if __name__=="__main__":
    st=Solution()
    points=[Point(i,j) for i in range(9) for j in range(3,12)]
    points=[Point(1,2),Point(1,2),Point(1,2),Point(3,6),Point(2,4),Point(4,8),Point(5,10),]
    # points=[Point(0,0)]
    # points=[Point(0,0),Point(1,0)]

    points=[Point(0,0),Point(1,1),Point(1,-1)]
    points=[Point(0,0),Point(94911151,94911150),Point(94911152,94911151)]

    out=st.maxPoints(points)
    print(out)
    float```

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