old_contents: """
  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.
  """
  
  import bisect
  from collections import deque
  
  class RecentCounter:
  
      def __init__(self):
          self.calls = []
          self.start_idx = 0
  
      def ping(self, t: int) -> int:
          self.calls.append(t)
          pos = bisect.bisect_left(self.calls, t- 3000, lo=self.start_idx)
          self.start_idx = pos
          return len(self.calls) - pos
  
  class RecentCounter:
      def __init__(self):
          self.slide_window = deque()
  
      def ping(self, t: int) -> int:
          # step 1). append the current call
          self.slide_window.append(t)
  
          # step 2). invalidate the outdated pings
          while self.slide_window[0] < t - 3000:
              self.slide_window.popleft()
  
          return len(self.slide_window)
          
          
  
  
  # Your RecentCounter object will be instantiated and called as such:
  # obj = RecentCounter()
  # param_1 = obj.ping(t)
new_contents: """
  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.
  """
  
  import bisect
  from collections import deque
  
  class RecentCounter:
  
      def __init__(self):
          self.calls = []
          self.start_idx = 0
  
      def ping(self, t: int) -> int:
          self.calls.append(t)
          pos = bisect.bisect_left(self.calls, t- 3000, lo=self.start_idx)
          self.start_idx = pos
          return len(self.calls) - pos
  
  class RecentCounter2:
      def __init__(self):
          self.slide_window = deque()
  
      def ping(self, t: int) -> int:
          # step 1). append the current call
          self.slide_window.append(t)
  
          # step 2). invalidate the outdated pings
          while self.slide_window[0] < t - 3000:
              self.slide_window.popleft()
  
          return len(self.slide_window)
          
          
  
  
  # Your RecentCounter object will be instantiated and called as such:
  # obj = RecentCounter()
  # param_1 = obj.ping(t)
subject: rename recent counter 2 to differentiate