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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. class FenwickTree {
  5.     vector<int> bit;
  6.     int n;
  7.  
  8. public:
  9.     FenwickTree(int size) : n(size), bit(size + 1, 0) {}
  10.  
  11.     void update(int index, int delta) {
  12.         for (++index; index <= n; index += index & -index)
  13.             bit[index] += delta;
  14.     }
  15.  
  16.     int query(int index) {
  17.         int sum = 0;
  18.         for (++index; index > 0; index -= index & -index)
  19.             sum += bit[index];
  20.         return sum;
  21.     }
  22.  
  23.     int rangeQuery(int left, int right) {
  24.         return query(right) - query(left - 1);
  25.     }
  26. };
  27.  
  28. int main() {
  29. 	// your code goes here
  30. 	return 0;
  31. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/mHMrEt
language:
C++14 (gcc 8.3)
created:
8 hours ago
visibility:
public

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