Please give some online judge problems in which prefix sum( also known as cumulative sum) technique is useful. and freuqancy array
Please give some online judge problems in which prefix sum( also known as cumulative sum) technique is useful. and freuqancy array
| № | 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 → |
| № | Пользователь | Вклад |
|---|---|---|
| 1 | Qingyu | 155 |
| 2 | nik_exists | 150 |
| 2 | maspy | 150 |
| 4 | Um_nik | 144 |
| 5 | Errichto | 139 |
| 6 | adamant | 137 |
| 7 | AmShZ | 136 |
| 8 | BledDest | 132 |
| 8 | maroonrk | 132 |
| 10 | qwexd | 129 |
can you tell me how to approach RANGESUM using prefix array. We're adding a new element every time here, we'll have to calculate prefix sum every time.
Store the array as its reverse and then use prefix sum.
Here are some : - https://codeforces.me/contest/961/problem/B
https://atcoder.jp/contests/abc186/tasks/abc186_d
https://codeforces.me/contest/327/problem/A
https://codeforces.me/contest/433/problem/B
https://atcoder.jp/contests/abc182/tasks/abc182_d
https://leetcode.com/problems/grumpy-bookstore-owner/
https://www.codechef.com/problems/JUN2
https://codeforces.me/contest/729/problem/B
2-d Prefix Sums :
https://www.codechef.com/APRIL21B/problems/KAVGMAT
https://cses.fi/problemset/task/1652
https://www.codechef.com/IARCSJUD/problems/TIMBER/
tnk
try edu