- array of numbers
- two operations:
- element update
- prefix sum calculation
| element update | prefix sum | |
|---|---|---|
| array of elements | O(1) | O(n) |
| array of prefix sums | O(n) | O(1) |
| Fenwick tree | O(log n) | O(log n) |
Fenwick Tree implementation in Python
| element update | prefix sum | |
|---|---|---|
| array of elements | O(1) | O(n) |
| array of prefix sums | O(n) | O(1) |
| Fenwick tree | O(log n) | O(log n) |
Fenwick Tree implementation in Python