Please give some online judge problems in which prefix sum( also known as cumulative sum) technique is useful. and freuqancy array
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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://mirror.codeforces.com/contest/961/problem/B
https://atcoder.jp/contests/abc186/tasks/abc186_d
https://mirror.codeforces.com/contest/327/problem/A
https://mirror.codeforces.com/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://mirror.codeforces.com/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/
try edu