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0239.滑动窗口最大值.md 加入 Python 版本新解法:用"堆排序"实现
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@ -339,6 +339,32 @@ class Solution:
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return result
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```
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#### 新解法:用"堆排序"实现
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* 时间复杂度:`O(n * log(n))`, 比`单调队列`解法要慢。
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```python
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import heapq
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class Solution:
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def maxSlidingWindow(self, nums: List[int], k: int) -> List[int]:
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results = []
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num_index_list = [] # 将用“堆排序”对它进行排序,元素为 (num, index) 元组
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for i in range(len(nums)):
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# 把 nums[i] 值取负数,最大的就到最小,合乎 Python 堆排序从小到大的规则。
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# 还要把 index (i) 存入,因为通过 i 可知道对应的 num 何时不能再被使用(num 已经处在左侧窗口的更左边)
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heapq.heappush(num_index_list, (-nums[i], i))
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# num_index_list[0]是最小值所在 tuple;'<= i - k' 表示 num 已经处在左侧窗口的更左边
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while num_index_list[0][1] <= i - k: # while 表示所有过气 num 都要丢弃
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heapq.heappop(num_index_list) # 丢弃最小值
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if i >= k - 1:
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results.append(-num_index_list[0][0]) # 第一个就是最小值,负最小值就是最大值,加入结果集
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return results
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```
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### Go:
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```go
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