Problem	fenwicktree_easy
User	Fr5ctal
Submission Time	2026-02-18 14:14:22
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

fenwicktree_easy.cpp: In function ‘int main()’:
fenwicktree_easy.cpp:44:25: error: ‘a’ was not declared in this scope
44 | update(x, y-a[x]);
| ^