Compilare: main.cpp: In function 'int main()': main.cpp:18:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i=1;i<s.size();i++){ | ~^~~~~~~~~ main.cpp:29:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for(int i=0;i<s.size();i++){ | ~^~~~~~~~~ main.cpp:30:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | if(z[i]==a.size()){ | ~~~~^~~~~~~~~~ main.cpp:38:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(int i=0;i<v.size();i++){ | ~^~~~~~~~~ main.cpp:15:8: warning: unused variable 'sizea' [-Wunused-variable] 15 | int sizea=a.size(); | ^~~~~