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:42:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0;k<newLupt.size();k++) ^ user.cpp:55:1: warning: control reaches end of non-void function [-Wreturn-type] } ^