Range Updates and Range Queries
In this section, we will discuss the concepts of range updates and range queries in Fenwick Trees.
Range Updates
Range updates allow us to update a range of values efficiently in a Fenwick Tree. To perform a range update, we traverse the Fenwick Tree using bitwise operations and update the values at each index within the given range.
Here's an example code snippet in C++ that demonstrates how to perform a range update on a Fenwick Tree:
TEXT/X-C++SRC
1#include <iostream>
2using namespace std;
3
4void rangeUpdate(int fenwick[], int index, int value) {
5 while (index <= n) {
6 fenwick[index] += value;
7 index += (index & -index);
8 }
9}
10
11int main() {
12 int n;
13 cin >> n;
14
15 int fenwick[n + 1];
16 for (int i = 0; i <= n; i++) {
17 fenwick[i] = 0;
18 }
19
20 int start, end, value;
21 cin >> start >> end >> value;
22
23 rangeUpdate(fenwick, start, value);
24 rangeUpdate(fenwick, end + 1, -value);
25
26 return 0;
27}xxxxxxxxxxusing namespace std;int main() { // Replace with your C++ logic for range updates and range queries return 0;}OUTPUT
:001 > Cmd/Ctrl-Enter to run, Cmd/Ctrl-/ to comment
