Compilare: main.cpp: In function 'int main()': main.cpp:18:27: 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 = 0 ; i < s.size() ; ++ i) | ~~^~~~~~~~~~ main.cpp:19:19: warning: array subscript has type 'char' [-Wchar-subscripts] 19 | p[s[i]].push_back(i); | ^ main.cpp:20:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int i = 0 ; i < s.size() ; ++ i){ | ~~^~~~~~~~~~ main.cpp:22:40: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | if(s[i] != l && ind[l] < p[l].size()){