Compilare: main.cpp: In function 'int main()': main.cpp:31:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i = 2; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:38:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | while(r + 1 < s.size() && s[r + 1] == s[r + 1 - l + 1]) { | ~~~~~~^~~~~~~~~~ main.cpp:45:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | while(r + 1 < s.size() && s[r + 1] == s[r + 1 - l + 1]) { | ~~~~~~^~~~~~~~~~ main.cpp:52:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for(int i = s.size() / 2; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:71:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | if(len >= s.size() - len) continue; // check for intersection | ~~~~^~~~~~~~~~~~~~~~~