Compilare: user.cpp: In function ‘void prim()’: user.cpp:65:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j=0;j<v[x].size();++j ){ ^ user.cpp: In function ‘int main()’: user.cpp:90:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i=0;i<v[1].size();++i ){ ^ user.cpp:81:27: 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:86:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&a,&b,&d); ^