Compilare: main.cpp: In function 'void build_lps()': main.cpp:16:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | while(i < s1.size()) | ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | while(i < s2.size()) | ~~^~~~~~~~~~~ main.cpp:55:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | if(j == s1.size()) | ~~^~~~~~~~~~~~