Compilare: user.cpp: In function ‘void Afisare(std::vector<int>&)’: user.cpp:13:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vec.size();i++) ^ user.cpp: In function ‘bool Ok(std::vector<int>&, int, int, bool*)’: user.cpp:23:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(vec.size()<N){ ^ user.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(vec.size()>=N){ ^ user.cpp:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(vec.size()!=N){ ^ user.cpp: In function ‘void Backtrack1(std::vector<int>&, int, bool*, int)’: user.cpp:65:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(vec.size()>=2*N){ ^ user.cpp: In function ‘bool Egale(std::vector<int>&, std::vector<int>&)’: user.cpp:87:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v1.size();i++) ^ user.cpp: In function ‘void Backtrack2(std::vector<int>&, int, bool*, std::vector<int>&)’: user.cpp:99:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(vec.size()>=2*N){ ^