Compilare: main.cpp: In function 'long long int p(std::string)': main.cpp:31:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (ll i=0;i<s.size();i++) { | ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare] 45 | if (s2.size()*2==k) {s+=s2; s[0]++;} | ~~~~~~~~~~~^~~ main.cpp:47:23: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare] 47 | for (int i=2;i<(k/2)-s2.size();i++) s+="0"; | ~^~~~~~~~~~~~~~~~