Link to the submission: Here. I don't know why it got runtime error when using reference for variable $$$i$$$ (index of the current note in the segment tree in build function).
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Unlucky :(
[DELETED]
I'm telling about you
[DELETED]
You do some strange thing, I cannot tell why it should work in first place.
ok
Can someone help me please ;-;.
Really interesting, I think the problem is that i sometimes gets trash value after build(tr[i].extra, mid + (1 << len) + 1, r). I don't know why, though. The code looks fine to me actually.