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# 605.Can Place Flowers

605.Can Place Flowers

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.

class Solution {
public:
bool canPlaceFlowers(vector<int>& flowerbed, int n) {
flowerbed.push_back(0);
flowerbed.push_back(1);
int total=0;
int start=-2;
for(int i=0; i<flowerbed.size();i++ )
{
if(flowerbed[i] ) {
int r=i-start-3;
start=i;
// cout<<r<<endl;
if(r<1 ) continue;
total += (r+ r%2) /2;
}
}
// cout<<total<<endl;