Compilare: main.cpp: In function 'int main()': main.cpp:21:37: 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 i = 1, l = 0, r = 0; i < a.size(); ++i) | ~~^~~~~~~~~~ main.cpp:25:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | while (i + z[i] < a.size() && a[z[i]] == a[i + z[i]]) | ~~~~~~~~~^~~~~~~~~~ main.cpp:30:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for (int i = m + 1; i < a.size(); ++i) | ~~^~~~~~~~~~