Compilare: user.cpp: In function ‘int get_int(std::string)’: user.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(poz < s.size() && s[poz] >= '0' && s[poz] <= '9') { ^ user.cpp: In function ‘long long int solve(int, int)’: user.cpp:29:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(poz < s[x][y].size()) { ^ user.cpp:31:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz == s[x][y].size()) ^