Compilare: main.cpp: In function 'long long int has(std::string)': main.cpp:38:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(int i=0; i<s.length(); i++){ | ~^~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:49:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for(int i=0; i<a.length(); i++){ | ~^~~~~~~~~~~ main.cpp:58:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for(int i=a.length(); i<b.length(); i++){ | ~^~~~~~~~~~~ main.cpp:66:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for(int i=0; i<v.size(); i++){ | ~^~~~~~~~~ main.cpp:53:8: warning: unused variable 'ras' [-Wunused-variable] 53 | ll ras=0; | ^~~