# 12.12.2025 [3433. Count Mentions Per User]
Автор: KittyCat, Keyboard and LeetCode
Загружено: 2025-12-12
Просмотров: 7
12.12.2025
[3433. Count Mentions Per User](https://leetcode.com/problems/count-m...) medium
[blog post](https://leetcode.com/problems/count-m...)
[substack](https://open.substack.com/pub/dmitrii...)
[youtube]( • # 12.12.2025 [3433. Count Mentions Per User] )
#### Join me on Telegram
https://t.me/leetcode_daily_unstoppab...
#### Problem TLDR
Count messages and track online users #medium #simulation
#### Intuition
The problem is not that big. Sort by timestamp and put queries after offline modifications.
#### Approach
use queue of coming online or just array of coming online times for all users
#### Complexity
Time complexity:
$$O(n^2)$$
Space complexity:
$$O(n)$$
#### Code
https://dmitrysamoylenko.com/2023/07/...
![# 12.12.2025 [3433. Count Mentions Per User]](https://ricktube.ru/thumbnail/xctbYDDg_uA/hq720.jpg)
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