Compilare: main.cpp: In function 'bool query(int, int, int, int, int, int, int)': main.cpp:41:30: warning: self-comparison always evaluates to true [-Wtautological-compare] if (_left <= left and right <= right) { ~~~~~~^~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("gossips.in", "r", stdin); ^ main.cpp:55:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("gossips.out", "w", stdout); ^