Compilare: user.cpp: In function ‘int main()’: user.cpp:143:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < paths.size() - 1; ++ i) ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:14:47: 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, input_file); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:36:51: 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, input_file); ^ user.cpp: In function ‘int bfs()’: user.cpp:75:12: warning: ‘node’ may be used uninitialized in this function [-Wmaybe-uninitialized] return node; ^