Fenwick Tree Mastery: Core Operations and Practical Applications
Core Functinos
1. Point Update Operation
void update(int idx, int delta) {
while (idx <= arrSize) {
tree[idx] += delta;
idx += idx & -idx; // Propagate to parent nodes
}
}
2. Prefix Sum Query
long long query(int pos) {
long long result = 0;
while (pos > 0) {
result += tree[pos];
pos -= pos & -pos; // Move ...
Posted on Sat, 13 Jun 2026 18:23:20 +0000 by rupam_jaiswal