Each day a plant is growing by upSpeed meters. Each night that plant's height decreases by downSpeed meters due to the lack of sun heat. Initially, plant is 0 meters tall. We plant the seed at the beginning of a day. We want to know when the height of the plant will reach a certain level.

Example

For upSpeed = 100, downSpeed = 10, and desiredHeight = 910, the output should be

growingPlant(upSpeed, downSpeed, desiredHeight) = 10.

 

我的解答：

import mathdef growingPlant(upSpeed, downSpeed, desiredHeight):    if upSpeed > desiredHeight:        return 1    return math.ceil((desiredHeight - upSpeed) / (upSpeed - downSpeed)) + 1

 

 

一样滴