Compilare: user.cpp: In function ‘int immortal(std::vector<std::pair<int, int> >, bool (*)[21], std::vector<std::pair<std::pair<int, int>, std::pair<int, int> > >)’: user.cpp:25:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i<lista.size(); i++) ^ user.cpp:31:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i<lupt.size(); i++) ^ user.cpp:43:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k<newLupt.size(); k++) ^