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Graph/so-79295314

Answer

so-79295314

so-79295314

so-79295314

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PROPOSESSolution

create an auxiliary list with the indices of the letters that are smaller than `t[i]` — Then use simple math to determine how many subsequences you can form using the ranges between the indices in `x`. Tension: You can form `3C1+3C2+3C3=6` subsequences, but you’ll have to subtract the subsequences for `[0-0]` (already counted) and `[1-1]` (not included). Outcome: that gives us `1+4=5` subsequences.

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