Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:29:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) if(!viz[v[x][i]]) DFS(v[x][i]); ^ user.cpp: In function ‘void DFST(int)’: user.cpp:36:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<w[x].size();++i) if(viz[w[x][i]]) DFST(w[x][i]); ^ user.cpp: In function ‘void CTC()’: user.cpp:56:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();++j) if(comp[v[i][j]] != comp[i]) G[comp[i]][comp[v[i][j]]] = true; ^ user.cpp:42:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k; ^ user.cpp: In function ‘int main()’: user.cpp:121:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<rez.size();++i) g<<rez[i].first<<" "<<rez[i].second<<"\n"; ^ user.cpp:114:9: warning: unused variable ‘plm’ [-Wunused-variable] int plm = 0; ^