Compilare: user.cpp: In function ‘double solve(int, int)’: user.cpp:64:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<aux.size();i++) ^ user.cpp:65:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=1;j<8 && i+j<aux.size();j++) ^ user.cpp: In function ‘bool cmp(const std::pair<int, int>&, const std::pair<int, int>&)’: user.cpp:21:1: warning: control reaches end of non-void function [-Wreturn-type] } ^