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need help with fenwicktree 2d for solving question forest queries 2 on cses
https://codeforces.net/contest/1928/submission/246087824
I am new to range query data structures so i am treating fenwick tree as a black box. I know the working of fenwick but not able to code a 2d one.
I asked chatgpt for help it is giving wrong code I want it similar to this template so if anyone can help me with it.
