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力扣 1232.缀点成线
2022-07-07 17:53:00 【Tomorrowave】
1232.缀点成线
给定一个数组 coordinates ,其中 coordinates[i] = [x, y] , [x, y] 表示横坐标为 x、纵坐标为 y 的点。请你来判断,这些点是否在该坐标系中属于同一条直线上。
示例 1:
输入:coordinates = [[1,2],[2,3],[3,4],[4,5],[5,6],[6,7]]
输出:true
思路
利用斜率的乘积来做
代码部分
class Solution:
def checkStraightLine(self, coordinates: List[List[int]]) -> bool:
a=coordinates[1][0]-coordinates[0][0]
b=coordinates[1][1]-coordinates[0][1]
for i in range(2,len(coordinates)):
c = coordinates[i][0] - coordinates[0][0]
d = coordinates[i][1] - coordinates[0][1]
if (a * d - b * c != 0):
return False
return True
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