Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:59:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < G[X].size(); i ++ ) { ^ user.cpp: In member function ‘void inputReader::advance()’: user.cpp:22:48: 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, inputFile ); ^ user.cpp: In constructor ‘inputReader::inputReader(const char*)’: user.cpp:34:44: 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, inputFile ); ^ user.cpp: In function ‘int main(int, const char**)’: user.cpp:169:24: warning: ‘col’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << col << " " << val << endl; ^