# 362. Design Hit Counter

{% embed url="<https://leetcode.com/problems/design-hit-counter/>" %}

保持记录的头尾`timestamp`差值不超过300即可。

```python
class HitCounter:

    def __init__(self):
        """
        Initialize your data structure here.
        """
        self.clicks = []

    def hit(self, timestamp: int) -> None:
        """
        Record a hit.
        @param timestamp - The current timestamp (in seconds granularity).
        """
        self.clicks.append(timestamp)
        while self.clicks and self.clicks[-1] - self.clicks[0] >= 300:
            self.clicks.pop(0)
        

    def getHits(self, timestamp: int) -> int:
        """
        Return the number of hits in the past 5 minutes.
        @param timestamp - The current timestamp (in seconds granularity).
        """
        while self.clicks and timestamp - self.clicks[0] >= 300:
            self.clicks.pop(0)
        return len(self.clicks)
        


# Your HitCounter object will be instantiated and called as such:
# obj = HitCounter()
# obj.hit(timestamp)
# param_2 = obj.getHits(timestamp)
```
