2021 Day 17

class Probe {
    val minX = 14
    val maxX = 50
    val minY = -225
    val maxY = -267
    val yVelocities = maxY..(maxY * -1)
    val xVelocities = 1..maxX

    @Test
    fun probes() {
        println( "Part 2 " + yVelocities.sumBy { yVel ->
            xVelocities.count { xVel ->
                throwProbe(yVel, xVel)
            }
        })
    }

    private fun throwProbe(yVel: Int, xVel: Int): Boolean {
        var yVelI = yVel
        var xVelI = xVel
        var x = 0
        var y = 0
        while (x <= maxX && y >= maxY) {
            if (x >= minX && y <= minY) {
                return true
            }
            x += xVelI
            y += yVelI
            if (xVelI != 0) xVelI -= 1
            yVelI -= 1
        }
        return false
    }
}