votare.cpp: In constructor 'Buffer::Buffer(std::string, int)': votare.cpp:21: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result votare.cpp: In constructor 'Buffer::Buffer(std::string, int)': votare.cpp:21: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result votare.cpp: In constructor 'Buffer::Buffer(std::string, int)': votare.cpp:21: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result votare.cpp: In member function 'void Buffer::refill()': votare.cpp:57: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result votare.cpp: In function 'void query(node*)': votare.cpp:147: warning: unused variable 'i' votare.cpp:147: warning: unused variable 'j' votare.cpp: In function 'int main()': votare.cpp:186: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result