Compilare: main.cpp: In function 'void precompute()': main.cpp:24:21: 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 i = 2;i < a.size();++i) { | ~~^~~~~~~~~~ main.cpp: In function 'void compute()': main.cpp:37:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for(int i = 1;i < b.size();++i) { | ~~^~~~~~~~~~ main.cpp:46:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | if(q == a.size() - 1) { | ~~^~~~~~~~~~~~~~~