Compilare: user.cpp: In function ‘std::vector<std::pair<int, int> > solve_tree(std::vector<int>&)’: user.cpp:17:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < deg.size(); i++) { ^ user.cpp:13:7: warning: unused variable ‘ind’ [-Wunused-variable] int ind; ^ user.cpp: In function ‘std::vector<std::pair<int, int> > solve_graf_neconex(std::vector<int>&)’: user.cpp:60:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < deg.size(); i++) ^ user.cpp:66:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind[i] < G[i].size()) { ^ user.cpp:76:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (c == G[l].size()) { ^ user.cpp: In function ‘std::vector<std::pair<int, int> > solve_graf_conex(std::vector<int>&)’: user.cpp:102:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < deg.size(); i++) ^ user.cpp:108:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ind[i] < G[i].size()) { ^ user.cpp:118:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (c == G[l].size()) { ^ user.cpp:94:10: warning: unused variable ‘exists’ [-Wunused-variable] bool exists = true; ^