####kquery0 error
@nmaurya760,
Why have you declared vector<int>tree[n * 4]; inside build and query functions. Segment tree should be global so that it can be accessed by any function.
still errors are comming
@nmaurya760,
Please share Coding Blocks IDE link of your code.
Also global arrays should have static size, so try something like vector<int>tree[400005];
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