LeetCode - Number of Recent Calls

Write a class RecentCounter to count recent requests.

It has only one method: ping(int t), where t represents some time in milliseconds.

Return the number of pings that have been made from 3000 milliseconds ago until now.

Any ping with time in [t - 3000, t] will count, including the current ping.

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

Example 1:

Input: inputs = ["RecentCounter","ping","ping","ping","ping"], inputs = [[],[1],[100],[3001],[3002]]

Output: [null,1,2,3,3]

Note:

Each test case will have at most 10000 calls to ping.

Each test case will call ping with strictly increasing values of t.

Each call to ping will have 1 <= t <= 10^9.

class RecentCounter {

    Queue<Integer> q;

    public RecentCounter() {

        q = new LinkedList();

    }

    public int ping(int t) {

        q.add(t);

        while(q.peek() < t - 3000 ){

            q.poll();

        }

        return q.size();

    }

}

/**

 * Your RecentCounter object will be instantiated and called as such:

 * RecentCounter obj = new RecentCounter();

 * int param_1 = obj.ping(t);

 */