Compilare: main.cpp: In function 'int main()': main.cpp:24:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for (int j = 1, l = 0, r = 0; j < s.size(); ++j) | ~~^~~~~~~~~~ main.cpp:28:29: 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 (j + z[j] < s.size() && s[z[j]] == s[j + z[j]]) | ~~~~~~~~~^~~~~~~~~~ main.cpp:34:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for (int j = 1; j < s.size(); ++j) | ~~^~~~~~~~~~ main.cpp:35:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | if (j + z[j] == s.size()) | ~~~~~~~~~^~~~~~~~~~~ main.cpp:38:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (int j = 0; j < s.size(); ++j) | ~~^~~~~~~~~~