Compilare: user.cpp: In member function ‘void TreeMIS::get_subtrees(const std::vector<std::vector<int> >&, int, int)’: user.cpp:25:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<T[x].size(); ++i) ^ user.cpp: In member function ‘int TreeMIS::get_root(const std::vector<std::vector<int> >&)’: user.cpp:46:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<T[i].size(); ++j) ^ user.cpp: In member function ‘void TreeMIS::get_partition(const std::vector<std::vector<int> >&, const std::vector<int>&, int, int, int, std::vector<std::vector<int> >&, std::vector<int>&)’: user.cpp:78:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<T[x].size(); ++i) ^ user.cpp: In member function ‘void TreeMIS::bs(std::vector<int>&, int, int (*)(int, int))’: user.cpp:112:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (hi == S.size()) ^ user.cpp: In member function ‘void TreeMIS::dfs(const std::vector<std::vector<int> >&, const std::vector<int>&, std::vector<std::vector<int> >&, int, int, int (*)(int, int))’: user.cpp:123:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<T[x].size(); ++i) ^ user.cpp:154:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<T[x].size(); ++i) ^ user.cpp:163:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<S[d].size(); ++j) ^ user.cpp: In member function ‘int TreeMIS::solve(std::vector<std::vector<int> >&, std::vector<int>&)’: user.cpp:217:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<T[r].size(); ++i) ^ user.cpp:220:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j < Sd[c].size(); ++j) ^ user.cpp:234:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<T[r].size(); ++i) ^ user.cpp:240:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<Si[c].size(); ++j) ^ user.cpp:268:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<T[r].size(); ++i) ^