LeetCode 605 Can Place Flowers

##题目 Suppose you have a long flowerbed in which some of the plots are planted and some are not. However, flowers cannot be planted in adjacent plots - they would compete for water and both would die. Given a flowerbed (represented as an array containing 0 and 1, where 0 means empty and 1 means not empty), and a number n, return if n new flowers can be planted in it without violating the no-adjacent-flowers rule. Example 1: Input: flowerbed = [1,0,0,0,1], n = 1 Output: True

Example 2: Input: flowerbed = [1,0,0,0,1], n = 2 Output: False

Note: The input array won't violate no-adjacent-flowers rule. The input array size is in the range of [1, 20000]. n is a non-negative integer which won't exceed the input array size.

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##代码

func canPlaceFlowers(_ flowerbed: [Int], _ n: Int) -> Bool {
        var count: Int = 0
        var arr = flowerbed
        for i in 0..<arr.count {
            if (arr[i] == 0 && (i == 0 || arr[i - 1] == 0) && (i == arr.count - 1 || arr[i + 1] == 0)) {
                arr[i] = 1
                count += 1
            }
            if  count >= n {
                return true
            }
        }
        return false
    }