Lemonade Change

Lemonade Change.go

func lemonadeChange(bills []int) bool {
    numFive :=0
    numTen :=0
    numTwenty :=0
    
    for i := range bills {
        switch bills[i] {
            case 5: 
                numFive +=1
            case 10 :
                if numFive >=1 {
                    numTen += 1
                    numFive -= 1
                } else{
                    return false
                }
            case 20:
                if numTen >=1  &&  numFive >=1 {
                    numTen -= 1 
                    numFive -= 1
                } else if numFive >= 3 {
                    numFive -= 3 
                } else {
                    return false
                }
        }
    }
    return  numFive >=0 && numTen >= 0 && numTwenty >= 0
}