Compilare: user.cpp: In function ‘void leaves()’: user.cpp:39:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[node].size();++i) ^ user.cpp: In function ‘void bfs()’: user.cpp:63:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<frunza[papa].size();++i) q.push(frunza[papa][i]); ^ user.cpp:70:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<frunza[val[node]].size();++i) ^ user.cpp:77:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[node].size();++i) ^ user.cpp: In function ‘void solve()’: user.cpp:111:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();++j) ^ user.cpp:108:13: warning: unused variable ‘guta’ [-Wunused-variable] int guta; ^ user.cpp: In function ‘void bfs()’: user.cpp:54:9: warning: ‘papa’ may be used uninitialized in this function [-Wmaybe-uninitialized] int papa; ^