933. Number of Recent Calls-最近的请求次数

写一个RecentCounter类来计算特定时间范围内最近的请求。

请你实现RecentCounter类：

• RecentCounter()初始化计数器，请求数为 0 。
• int ping(int t)在时间t添加一个新请求，其中t表示以毫秒为单位的某个时间，并返回过去3000毫秒内发生的所有请求数（包括新请求）。确切地说，返回在[t-3000, t]内发生的请求数。

保证每次对ping的调用都使用比之前更大的t值。

示例 1：

输入：
["RecentCounter", "ping", "ping", "ping", "ping"]
[[], [1], [100], [3001], [3002]]
输出：
[null, 1, 2, 3, 3]

解释：
RecentCounter recentCounter = new RecentCounter();
recentCounter.ping(1);     // requests = [1]，范围是 [-2999,1]，返回 1
recentCounter.ping(100);   // requests = [1, 100]，范围是 [-2900,100]，返回 2
recentCounter.ping(3001);  // requests = [1, 100, 3001]，范围是 [1,3001]，返回 3
recentCounter.ping(3002);  // requests = [1, 100, 3001, 3002]，范围是 [2,3002]，返回 3

提示：

• 1 <= t <= 10^9
• 保证每次对ping调用所使用的t值都严格递增
• 至多调用ping方法10^4次

1.列表
Python:

class RecentCounter:

    def __init__(self):
        self.times = []

    def ping(self, t: int) -> int:
        self.times.append(t)
        length = len(self.times)
        i = length-1
        k = 3000
        count = 0
        while i >= 0 and t-self.times[i] <= k:
            count += 1
            i -= 1
        return count

# Your RecentCounter object will be instantiated and called as such:
# obj = RecentCounter()
# param_1 = obj.ping(t)

Java:

class RecentCounter {
    private List<Integer> lis;

    public RecentCounter() {
        lis = new ArrayList<Integer>();
    }

    public int ping(int t) {
        lis.add(t);
        int index = lis.size()-1;
        int count = 0;
        while(index >= 0 && lis.get(index) >= t-3000)
        {
            count += 1;
            index -= 1;
        }
        return count;
    }
}

/**
 * Your RecentCounter object will be instantiated and called as such:
 * RecentCounter obj = new RecentCounter();
 * int param_1 = obj.ping(t);
 */

2.队列
Python:

class RecentCounter:

    def __init__(self):
        self.queue = deque()        

    def ping(self, t: int) -> int:
        self.queue.append(t)
        while self.queue[0] < t-3000:
            self.queue.popleft()
        return len(self.queue)

# Your RecentCounter object will be instantiated and called as such:
# obj = RecentCounter()
# param_1 = obj.ping(t)

Java:

class RecentCounter {
    private Deque<Integer> queue;
    public RecentCounter() {
        queue = new ArrayDeque<Integer>();
    }

    public int ping(int t) {
        queue.offer(t);

        while(!queue.isEmpty() && queue.peek() < t-3000)
        {
            queue.poll();
        }
        return queue.size();
    }
}

/**
 * Your RecentCounter object will be instantiated and called as such:
 * RecentCounter obj = new RecentCounter();
 * int param_1 = obj.ping(t);
 */