I don't know if this trick was introduced or named earlier. But I found it interesting and decided to write a blog about it. The trick is simple and I wrote the blog simple too. Hope you don't get confused.
Please ignore the Chinese interface.
→ Обратите внимание
→ Трансляции
→ Лидеры (рейтинг)
| № | Пользователь | Рейтинг |
|---|---|---|
| 1 | jiangly | 3810 |
| 2 | Benq | 3676 |
| 3 | Kevin114514 | 3655 |
| 4 | maroonrk | 3463 |
| 5 | strapple | 3447 |
| 6 | Um_nik | 3387 |
| 7 | heuristica | 3322 |
| 8 | turmax | 3317 |
| 9 | tourist | 3307 |
| 10 | jiangbowen | 3291 |
| Страны | Города | Организации | Всё → |
→ Лидеры (вклад)
| № | Пользователь | Вклад |
|---|---|---|
| 1 | Qingyu | 156 |
| 2 | nik_exists | 150 |
| 2 | maspy | 150 |
| 4 | Um_nik | 141 |
| 5 | Errichto | 139 |
| 6 | adamant | 137 |
| 7 | AmShZ | 136 |
| 8 | BledDest | 132 |
| 9 | maroonrk | 131 |
| 10 | qwexd | 129 |
→ Найти пользователя
→ Прямой эфир
Codeforces (c) Copyright 2010-2026 Михаил Мирзаянов
Соревнования по программированию 2.0
Время на сервере: 25.09.2026 03:30:04 (f1).
Десктопная версия, переключиться на мобильную.
При поддержке
Using
setseems overcomplicated because you can solve the problem mentioned in the blog without set at all just keeping current minimum and delta.+1.
The author should probably specify that a set could be used if adding a 4th operation like "check membership" (i.e. checking for $$$x$$$ corrresponds to searching the set for $$$x-\delta$$$)
Yes, that would have sense with such operation.
This trick indeed has a name, it's offset. It allows adding something to all elements of a set.
I dont understand how to execute operation 1, how is the delta added to all of the elements in the set?
[1, 2, 3] + 2 = [3, 4, 5]
Venice Technique
Might be irrelevant but, Here's the same question but with Xor as an operation: For the Curious Ones!
Wow, the trick is amazing trick. Something new for me to learn today.
This trick using
setwill be more useful when there is one more query to be performed:delete element X. Just remove element (X − δ) from thesetortreemap(in Java), and there you go.