Compilare: user.cpp: In function ‘void citire()’: user.cpp:54:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<pv.size();i++) ^ user.cpp:56:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[pv[i].second].size();j++) fout<<v[pv[i].second][j]<<" "; ^ user.cpp:21:13: warning: unused variable ‘ok’ [-Wunused-variable] int i,j,ok,t1,t2,lv=1,x; ^ user.cpp:21:19: warning: unused variable ‘t2’ [-Wunused-variable] int i,j,ok,t1,t2,lv=1,x; ^