1232. Check If It Is a Straight Line

You are given an array coordinates, coordinates[i] = [x, y], where [x, y] represents the coordinate of a point. Check if these points make a straight line in the XY plane.

Example 1:

Input: coordinates = [[1,2],[2,3],[3,4],[4,5],[5,6],[6,7]]
Output: true

Example 2:

Input: coordinates = [[1,1],[2,2],[3,4],[4,5],[5,6],[7,7]]
Output: false

Constraints:

• 2 <= coordinates.length <= 1000
• coordinates[i].length == 2
• -10^4 <= coordinates[i][0], coordinates[i][1] <= 10^4
• coordinates contains no duplicate point.

# @lc code=start
using LeetCode

function check_straight_line(coordinates::Vector{Vector{Int}})::Bool
    coordinates .-= Ref(coordinates[1])
    slope = coordinates[2][1]//coordinates[2][2]
    for i in 3:length(coordinates)
        (coordinates[i][1]//coordinates[i][2] != slope) && (return false)
    end
    return true
end
# @lc code=end

check_straight_line (generic function with 1 method)

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