Compilare: user.cpp: In function ‘std::vector<std::pair<int, int> > solve_tree(std::vector<int>&)’: user.cpp:12:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘std::vector<std::pair<int, int> > solve_graf_neconex(std::vector<int>&)’: user.cpp:22:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < deg.size(); i++) ^ user.cpp:28:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind[i] < G[i].size()) { ^ user.cpp:38:36: 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:62:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < deg.size(); i++) ^ user.cpp:68:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ind[i] < G[i].size()) { ^ user.cpp:78:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (c == G[l].size()) { ^