605. Can Place Flowers

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605. Can Place Flowers

Description

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.

Given an integer array flowerbed containing 0‘s and 1‘s, where 0 means empty and 1 means not empty, and an integer n, return trueif n new flowers can be planted in the flowerbed without violating the no-adjacent-flowers rule and false otherwise.

Example 1:

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Input: flowerbed = [1,0,0,0,1], n = 1
Output: true

Example 2:

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

Constraints:

  • 1 <= flowerbed.length <= 2 * 10^4
  • flowerbed[i] is 0 or 1.
  • There are no two adjacent flowers in flowerbed.
  • 0 <= n <= flowerbed.length

Hints/Notes

Solution

Language: C++

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class Solution {
public:
    bool canPlaceFlowers(vector<int>& flowerbed, int n) {
        int m = flowerbed.size();
        for (int i = 0; i < m; i++) {
            if (flowerbed[i] == 0) {
                if ((i == 0 || flowerbed[i - 1] == 0) && (i == m - 1 || flowerbed[i + 1] == 0)) {
                    flowerbed[i] = 1;
                    n--;
                }
            }
        }
        return n <= 0;
    }
};