Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:62:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i=0;i<v[x].size();++i ){ ^ user.cpp: In function ‘int main()’: user.cpp:85:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:87:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&p[i]); ^ user.cpp:93:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^