188th Commit

README.md

@@ -149,10 +149,12 @@ Ace Coding Interview with 75 Qs
 [735]: ./src/page-7/735.%20Asteroid%20Collision/asteroidCollision.ts
 [394]: ./src/page-4/394.%20Decode%20String/decodeString.ts
 
-| Queue                       |          |        |
-| --------------------------- | -------- | ------ |
-| 933. Number of Recent Calls | Solution | Easy   |
-| 649. Dota2 Senate           | Solution | Medium |
+| Queue                       |                 |        |
+| --------------------------- | --------------- | ------ |
+| 933. Number of Recent Calls | [Solution][933] | Easy   |
+| 649. Dota2 Senate           | Solution        | Medium |
+
+[933]: ./src/page-9/933.%20Number%20of%20Recent%20Calls/RecentCounter.ts
 
 | Linked List                                   |                 |        |
 | --------------------------------------------- | --------------- | ------ |

src/page-9/933. Number of Recent Calls/RecentCounter.test.ts

@@ -0,0 +1,11 @@
+import { RecentCounter } from './RecentCounter';
+
+describe('933. Number of Recent Calls', () => {
+  test('RecentCounter', () => {
+    const recentCounter = new RecentCounter();
+    expect(recentCounter.ping(1)).toBe(1);
+    expect(recentCounter.ping(100)).toBe(2);
+    expect(recentCounter.ping(3001)).toBe(3);
+    expect(recentCounter.ping(3002)).toBe(3);
+  });
+});

src/page-9/933. Number of Recent Calls/RecentCounter.ts

@@ -0,0 +1,23 @@
+/**
+ * Accepted
+ */
+export class RecentCounter {
+  private queue: number[];
+
+  constructor() {
+    this.queue = [];
+  }
+
+  ping(t: number): number {
+    // Add the new request to the queue
+    this.queue.push(t);
+
+    // Remove requests that are outside the 3000 milliseconds window
+    while (this.queue[0] < t - 3000) {
+      this.queue.shift();
+    }
+
+    // The size of the queue is the number of requests in the last 3000 milliseconds
+    return this.queue.length;
+  }
+}