Compilare: main.cpp: In function 'void init()': 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 < s.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'void solve(int, int)': main.cpp:21:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | while (st >= 0 && dr < s.size() && s[st] == s[dr]) { | ~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:32:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for (int i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~