# 05.06.2023 [1232. Check If It Is a Straight Line]

05.06.2023

1232. Check If It Is a Straight Line medium
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Problem TLDR

Are all the x,y points in a line?

Intuition

We can compare tani=dyi/dxi=dy0/dx0t

Approach

• corner case is a vertical line

Complexity

• Time complexity:
  O(n)

• Space complexity:
  O(1)

Code

fun checkStraightLine(coordinates: Array<IntArray>): Boolean =
    with((coordinates[1][1] - coordinates[0][1])/
    (coordinates[1][0] - coordinates[0][0]).toDouble()) {
        coordinates.drop(2).all {
            val o = (it[1] - coordinates[0][1]) / (it[0] - coordinates[0][0]).toDouble()

            isInfinite() && o.isInfinite() || this == o
        }
    }