# GeetCode Hub

You have a `RecentCounter` class which counts the number of recent requests within a certain time frame.

Implement the `RecentCounter` class:

• `RecentCounter()` Initializes the counter with zero recent requests.
• `int ping(int t)` Adds a new request at time `t`, where `t` represents some time in milliseconds, and returns the number of requests that has happened in the past `3000` milliseconds (including the new request). Specifically, return the number of requests that have happened in the inclusive range `[t - 3000, t]`.

It is guaranteed that every call to `ping` uses a strictly larger value of `t` than the previous call.

Example 1:

```Input
["RecentCounter", "ping", "ping", "ping", "ping"]
[[], [1], [100], [3001], [3002]]
Output
[null, 1, 2, 3, 3]

Explanation
RecentCounter recentCounter = new RecentCounter();
recentCounter.ping(1);     // requests = [1], range is [-2999,1], return 1
recentCounter.ping(100);   // requests = [1, 100], range is [-2900,100], return 2
recentCounter.ping(3001);  // requests = [1, 100, 3001], range is [1,3001], return 3
recentCounter.ping(3002);  // requests = [1, 100, 3001, 3002], range is [2,3002], return 3
```

Constraints:

• `1 <= t <= 109`
• Each test case will call `ping` with strictly increasing values of `t`.
• At most `104` calls will be made to `ping`.

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