Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:65:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < G[i].size(); j++) ^ user.cpp: In function ‘void dfsT(int)’: user.cpp:77:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ; j < T[i].size(); j++ ) ^ user.cpp: In function ‘int main()’: user.cpp:133:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < sol[v[i].ord].size(); j++ ) ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:44:47: 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 constructor ‘InputReader::InputReader(const char*)’: user.cpp:17:43: 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); ^