Compilare: user.cpp: In function ‘void mergebuild(int, int, int)’: user.cpp:37:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<v[f1].size()&&j<v[f2].size()) ^ user.cpp:37:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<v[f1].size()&&j<v[f2].size()) ^ user.cpp:42:10: warning: statement has no effect [-Wunused-value] for(i;i<v[f1].size();i++) v[nod].push_back(v[f1][i]); ^ user.cpp:42:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i;i<v[f1].size();i++) v[nod].push_back(v[f1][i]); ^ user.cpp:43:10: warning: statement has no effect [-Wunused-value] for(j;j<v[f2].size();j++) v[nod].push_back(v[f2][j]); ^ user.cpp:43:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j;j<v[f2].size();j++) v[nod].push_back(v[f2][j]); ^