Compilare: user.cpp: In function ‘void d(int)’: user.cpp:29:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<cc.size(); ++i) wh[cc[i]]=nr; ^ user.cpp: In function ‘int main()’: user.cpp:74:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size(); ++i) g<<sol[i].first<<' '<<sol[i].second<<'\n'; ^ user.cpp:53:7: warning: unused variable ‘nri’ [-Wunused-variable] int nri=0,nro=0,r=0,con=-1; ^ user.cpp:53:13: warning: unused variable ‘nro’ [-Wunused-variable] int nri=0,nro=0,r=0,con=-1; ^ user.cpp:53:19: warning: unused variable ‘r’ [-Wunused-variable] int nri=0,nro=0,r=0,con=-1; ^