Compilare: main.cpp: In function 'int main()': main.cpp:20:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for (int i = 1, l = 0, r = 0; i < s.size(); ++i) | ~~^~~~~~~~~~ main.cpp:24:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | while (i + z[i] < s.size() && s[i + z[i]] == s[z[i]]) | ~~~~~~~~~^~~~~~~~~~ main.cpp:30:23: 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 = 1; i < s.size(); ++i) | ~~^~~~~~~~~~ main.cpp:40:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for (int j = 1; j < v[i].size(); ++j) | ~~^~~~~~~~~~~~~