Compilare: user.cpp: In function ‘void d(int)’: user.cpp:30:28: 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:76:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sus.size(); ++i) { ^ user.cpp:78:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<jos.size(); ++j) if(!fol[jos[j]] && er[sus[i]][jos[j]]) { ^ user.cpp:85:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<sj.size(); ++i) sol.push_back(make_pair(sj[i-1].second,sj[i].first)); ^ user.cpp:87:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<jos.size(); ++i) if(!fol[jos[i]]) { ^ user.cpp:91:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sus.size(); ++i) if(!fol[sus[i]]) sol.push_back(make_pair(sj.front().second,sus[i])); ^ user.cpp:94:27: 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:66:7: warning: unused variable ‘nri’ [-Wunused-variable] int nri=0,nro=0,r=0,con=-1; ^ user.cpp:66:13: warning: unused variable ‘nro’ [-Wunused-variable] int nri=0,nro=0,r=0,con=-1; ^ user.cpp:66:19: warning: unused variable ‘r’ [-Wunused-variable] int nri=0,nro=0,r=0,con=-1; ^ user.cpp:66:23: warning: variable ‘con’ set but not used [-Wunused-but-set-variable] int nri=0,nro=0,r=0,con=-1; ^