Compilare: user.cpp: In lambda function: user.cpp:31:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return x == mic.size(); }); } ^ user.cpp: In function ‘void backtrack(const std::vector<std::vector<int> >&, std::vector<std::vector<int> >&, std::vector<std::vector<int> >&, std::vector<int>&, int, int)’: user.cpp:44:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sz == cur.size()){ ^ user.cpp:51:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int next = cur.back() + 1; next < graf.size(); ++next){ ^ user.cpp: In function ‘void citeste_strings(std::ifstream&, std::vector<std::basic_string<char> >&)’: user.cpp:92:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < v.size(); ++i){ ^ user.cpp:93:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < v.size(); ++j){ ^ user.cpp: In function ‘int main()’: user.cpp:114:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < rez.size()-1; ++i){ ^ user.cpp:117:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = v[b].size() - lung; i < v[b].size(); ++i){ ^