Compilare: main.cpp: In function 'int main()': main.cpp:17:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i = 0; i < a.size(); i++) { | ~~^~~~~~~~~~ main.cpp:23:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:28:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | while(i + v[i] + 1 < s.size() && i - v[i] - 1 >= 0 && s[i + v[i] + 1] == s[i - v[i] - 1]) | ~~~~~~~~~~~~~^~~~~~~~~~ main.cpp:35:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(int i = 0; i < s.size(); i++) | ~~^~~~~~~~~~