Compilare: main.cpp: In function 'int main()': main.cpp:60:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | while (i < s.size()) { | ~~^~~~~~~~~~ main.cpp:80:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 80 | if (x <= s.size() / 3) | ~~^~~~~~~~~~~~~~~ main.cpp:90:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 90 | for (int i = 0; i < prefix.size(); i++) { | ~~^~~~~~~~~~~~~~~ main.cpp:95:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 95 | while (dr < s.size() - prefix[i]) { main.cpp:56:11: warning: unused variable 't1' [-Wunused-variable] 56 | clock_t t1 = clock(); | ^~