Compilare: main.cpp: In function 'int main()': main.cpp:14:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for (int i = 0; i < v.size(); i++) | ~~^~~~~~~~~~ main.cpp:16:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for (int i = 0; i < v.size(); i++) { | ~~^~~~~~~~~~ main.cpp:19:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | while (st > 0 && dr < v.size() - 1 && v[st - 1] == v[dr + 1]) { | ~~~^~~~~~~~~~~~~~ main.cpp:26:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | while (st > 0 && dr < v.size() - 1 && v[st - 1] == v[dr + 1]) { | ~~~^~~~~~~~~~~~~~