Compilare: main.cpp: In function 'int main()': main.cpp:24:22: 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(i = 0; i < b.size(); i++) | ~~^~~~~~~~~~ main.cpp:42:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for(i = m; i < a.size(); i++) | ~~^~~~~~~~~~ main.cpp:17:19: warning: unused variable 'x2' [-Wunused-variable] 17 | long long x1, x2, p, p1; | ^~