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(leetcode题解)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.
这道题采用贪心算法,满足连续三个零就是一个符合点,一次遍历即可,首尾的边界问题(只需要两个连续零)不能忽略。
C++实现如下:
bool canPlaceFlowers(vector<int>& flowerbed, int n) { int length=flowerbed.size(); int count=0; for(int i=0;i<length;) { while(flowerbed[i]==0) { i++; if((i==length-1||i==1)&&flowerbed[i]==0) count++; else if(i<length-1&&flowerbed[i]==0&&flowerbed[++i]==0) count++; } i++; if(n<=count) return true; } return false; }
(leetcode题解)Can Place Flowers
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