lib.rs
2,210 downloads per month Used in 8 crates (4 directly). MIT license . 15KB 173 lines. A Fenwick tree or binary indexed tree/bit indexed tree is a data structure that supports the following two operations efficiently over an array of numbers a[0..n]:. Calculate a prefix sum: a[0] + a[1] +... + a[i] Update one element: a[i] += delta With a naïve implementation, only one of the operations can ...