Compilare: main.cpp: In function 'int main()': main.cpp:16:20: 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 = 1; i <= s.size() / 3; i++) | ~~^~~~~~~~~~~~~~~ main.cpp:21:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for (int k = i; k < s.size() - 2 * i + 1; k++) | ~~^~~~~~~~~~~~~~~~~~~~~~