GrowingPlant.java

/*

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.

*/

int growingPlant(int upSpeed, int downSpeed, int desiredHeight) {
    int current=upSpeed;
    int count=1;
    while(current<desiredHeight){
        current=current+(upSpeed-downSpeed);
        count++;
    }
    return count;
}