Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[n].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:29:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.cpp:35:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &x); ^