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Need a link to "count different subsequences with interval queries" problem
If you've already seen this task somewhere, I'd be grateful for the link.
You are given a string of length about $$$10^5$$$. There are many queries about intervals of this string and for each interval, you have to calculate the number of distinct subsequences (not necessarily contiguous) of this interval.
The solution builds a segment tree and keeps matrices in each node. Have you seen this problem?
