2335. Minimum Amount of Time to Fill Cups

#### QUESTION:

You have a water dispenser that can dispense cold, warm, and hot water. Every second, you can either fill up 2 cups with different types of water, or 1 cup of any type of water.

You are given a 0-indexed integer array amount of length 3 where amount, amount, and amount denote the number of cold, warm, and hot water cups you need to fill respectively. Return the minimum number of seconds needed to fill up all the cups.

Example 1:

``````Input: amount = [1,4,2]
Output: 4
Explanation: One way to fill up the cups is:
Second 1: Fill up a cold cup and a warm cup.
Second 2: Fill up a warm cup and a hot cup.
Second 3: Fill up a warm cup and a hot cup.
Second 4: Fill up a warm cup.
It can be proven that 4 is the minimum number of seconds needed.
``````

Example 2:

``````Input: amount = [5,4,4]
Output: 7
Explanation: One way to fill up the cups is:
Second 1: Fill up a cold cup, and a hot cup.
Second 2: Fill up a cold cup, and a warm cup.
Second 3: Fill up a cold cup, and a warm cup.
Second 4: Fill up a warm cup, and a hot cup.
Second 5: Fill up a cold cup, and a hot cup.
Second 6: Fill up a cold cup, and a warm cup.
Second 7: Fill up a hot cup.
``````

Example 3:

``````Input: amount = [5,0,0]
Output: 5
Explanation: Every second, we fill up a cold cup.
``````

Constraints:

``````amount.length == 3
0 <= amount[i] <= 100
``````

#### SOLUTION:

``````class Solution {
func fillCups(_ amount: [Int]) -> Int {
var amount = amount
var result = 0
while amount.reduce(0, +) != 0 {
amount = amount.sorted()
if amount != 0 {
amount -= 1
}
if amount != 0 {
amount -= 1
}
result += 1
}
return result
}
}
``````