LeetCode – 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:

  1. The input array won’t violate no-adjacent-flowers rule.
  2. The input array size is in the range of [1, 20000].
  3. n is a non-negative integer which won’t exceed the input array size.
public class Solution {
    public boolean canPlaceFlowers(int[] flowerbed, int n) {
        if(n == 0) return true;
        if(flowerbed.length ==1){
             if(flowerbed[0] == 0 && n <=1){
                 return true;
             }
            else{
                return false;
            }
        }
        for(int i=0;i<flowerbed.length;i++){
            if(flowerbed[i] == 0){
                if(i==0 ){
                    if(flowerbed[i+1] ==0){
                        flowerbed[i] = 1;
                        n--;                        
                    }

                }
                else if(i == flowerbed.length-1){
                    if(flowerbed[i-1] == 0){
                        flowerbed[i] = 1;
                        n--;                        
                    }
                    
                }
                else if(flowerbed[i-1] ==0 && flowerbed[i+1] == 0){
                    flowerbed[i] = 1;
                    n--;
                }                
                
            }

        }
        return n<=0;
    }
}

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