Compilare: user.cpp: In function ‘void dfsalg(int)’: user.cpp:14:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < dfs[nod].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:28:31: 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:31:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &a, &b); ^