Compilare: main.cpp: In member function 'int BinaryIndexedTree::BinarySearch(int)': main.cpp:26:29: warning: unused variable 'cv' [-Wunused-variable] int ret(0), cv(val) ; ^~ main.cpp: In function 'int main()': main.cpp:46:13: warning: unused variable 'val' [-Wunused-variable] int val, type, a, b ; ^~~ main.cpp:42:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("aib.in", "r", stdin) ; ^ main.cpp:43:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("aib.out", "w", stdout) ; ^