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interface RecentCounter {    ping(t: number): number;}function RecentCounter(): RecentCounter {    const queue: number[] = [];    function ping(t: number): number {        queue.push(t);        while (queue.length > 0 && t - queue[0] > 3000) {            queue.shift();        }        return queue.length;    }    return { ping };}
export default RecentCounter;