Compilare: main.cpp: In function 'void build(std::string)': main.cpp:14:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | while(i<x.length()){ | ~^~~~~~~~~~~ main.cpp: In function 'void solve(std::string, std::string)': main.cpp:35:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | while(i<y.length()){ | ~^~~~~~~~~~~ main.cpp:39:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | if(j==x.length()){ | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:9: warning: unused variable 'n' [-Wunused-variable] 59 | int n; | ^