605. Can Place Flowers（LeetCode）

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.

 1     class Solution {
 2     public:
 3         bool canPlaceFlowers(vector<int>& flowerbed, int n) {
 4         int count = 0;
 5         int len = flowerbed.size();
 6         vector<int> vet(len+2, 0);
 7         for (int i = 0; i < len; i++)
 8         {
 9             vet[i+1]=(flowerbed[i]);
10         }
11         for (int i = 0; i < len; i++)
12         {
13             if (vet[i] == 0 && vet[i + 1] == 0 && vet[i + 2] == 0)
14             {
15                 count++;
16                 vet[i+1]=1;
17             }
18         }
19         //cout <<count<< endl;
20         if (n <= count)
21             return true;
22         else
23             return false;
24         }
25     };