Growing Plant
Description
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.
Input/Output
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[execution time limit] 4 seconds (js)
-
[input] integer upSpeed
A positive integer representing the daily growth.
Guaranteed constraints:
3 ≤ upSpeed ≤ 100.
- [input] integer downSpeed
A positive integer representing the nightly decline.
Guaranteed constraints:
2 ≤ downSpeed < upSpeed.
- [input] integer desiredHeight
A positive integer representing the threshold.
Guaranteed constraints:
4 ≤ desiredHeight ≤ 1000.
- [output] integer
The number of days that it will take for the plant to reach/pass desiredHeight (including the last day in the total count).
[JavaScript (ES6)] Syntax Tips
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// Prints help message to the console
// Returns a string
function helloWorld(name) {
console.log("This prints to the console when you Run Tests");
return "Hello, " + name;
}
Solution
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function growingPlant(upSpeed, downSpeed, desiredHeight) {
var g = upSpeed - downSpeed;
return Math.max(0,Math.ceil((desiredHeight-upSpeed)/g)) +1
}