number-of-recent-calls

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Algorithms

You have a <code>RecentCounter</code> class which counts the number of recent requests within a certain time frame.

Implement the <code>RecentCounter</code> class:

<ul>
	<li><code>RecentCounter()</code> Initializes the counter with zero recent requests.</li>
	<li><code>int ping(int t)</code> Adds a new request at time <code>t</code>, where <code>t</code> represents some time in milliseconds, and returns the number of requests that have happened in the inclusive range <code>[t - 3000, t]</code>, that is, the new request plus every earlier request that is no more than <code>3000</code> milliseconds older.</li>
</ul>

It is guaranteed that every call to <code>ping</code> uses a strictly larger value of <code>t</code> than the previous call.

&nbsp;
Example 1:

<pre>
Input
[&quot;RecentCounter&quot;, &quot;ping&quot;, &quot;ping&quot;, &quot;ping&quot;, &quot;ping&quot;]
[[], [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
</pre>

&nbsp;
Constraints:

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

Weekly Contest 109

weekly-contest-109

Senior

Number of Recent Calls

Design

Queue

Data Stream

Accepted

Wrong Answer

Memory Limit Exceeded

Output Limit Exceeded

Time Limit Exceeded

Runtime Error

Internal Error

Compile Error

Timeout

Restrictions Failed

cangjie

react

vanillajs

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 have happened in the inclusive range [t - 3000, t], that is, the new request plus every earlier request that is no more than 3000 milliseconds older.

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.