Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:52:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(visited == trib[trnow].size()) ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:20:39: 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:46:41: 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); ^