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.

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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


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Constraints:


	1 &lt;= t &lt;= 109
	Each test case will call ping with strictly increasing values of t.
	At most 104 calls will be made to ping.


class RecentCounter:
    # Here we use list to store ping details.
    def __init__(self):
        self.store = []

    def ping(self, t: int) -> int:
        # Basically what we need to return is how many pings fall in the range(t-3000, t).
        # So here we append every t. Now in loop how many t from left side < t-3000, we just pop them
        # and return the length of the list, which'd contain elements in range(t-3000, t).
        # And since every t is going to greater than previous, we don't need to think about duplicates.

        self.store.append(t)

        while self.store[0] < t-3000:
            self.store.pop(0)

        return len(self.store)
class RecentCounter {
    ArrayList<Integer> calls ;
    public RecentCounter() {
        calls = new ArrayList<Integer>();
        }
    
    public int ping(int t) {
        calls.add(t);
        int count = 0;
        for(Integer call:calls){
            if( t-call<=3000) count++;
        }
        return count;
        
    }
}

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

    int ping(int t) {
        q.push(t);
        int x = q.front();
        while(x < t-3000){
            q.pop(); x = q.front();
        }
        return q.size();
    }
};
var RecentCounter = function() {
    this.arr = [];
};

RecentCounter.prototype.ping = function(t) {
    this.arr.push(t);
    while(t > this.arr[0]+3000){
        this.arr.shift();
    }
    return this.arr.length;
};
Number of Recent Calls