Added Number of Recent Calls.java

Author: varunu28

Easy/Number of Recent Calls.java

@@ -0,0 +1,22 @@
+class RecentCounter {
+  Queue<Integer> queue;
+  int limit;
+  public RecentCounter() {
+    queue = new LinkedList<>();
+    limit = 3000;
+  }
+
+  public int ping(int t) {
+    queue.add(t);
+    while (!queue.isEmpty() && ((t - queue.peek()) > limit)) {
+      queue.remove();
+    }
+    return queue.size();
+  }
+}
+
+/**
+ * Your RecentCounter object will be instantiated and called as such:
+ * RecentCounter obj = new RecentCounter();
+ * int param_1 = obj.ping(t);
+ */