Compilare: main.cpp: In member function 'll LineContainer::query(ll)': main.cpp:95:22: warning: unused variable 'l' [-Wunused-variable] Line l = {0, 0, 0, 0}; ^ main.cpp: In function 'int main()': main.cpp:122:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("niciomare.in", "r", stdin); ^ main.cpp:123:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("niciomare.out", "w", stdout); ^ main.cpp: In function 'char advance()': main.cpp:12:35: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buffer, SIZE, 1, stdin); ^