Status: IN
The formula `f(high) - f(low - 1)` is used to count elements satisfying a predicate in a range by subtracting prefix counts, as seen in `count_odds` where `(high+1)//2 - low//2` computes odds in `[low, high]`.
Source: entries/2026/06/06/count-odd-numbers-in-an-interval-range-solution.md