Compilare: user.cpp: In function ‘int main()’: user.cpp:53:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] { for (j=0;j<componente[i].size();j++) ^ user.cpp:31:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:37:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(f,"%d %d",&x,&y); ^