Compilare: main.cpp: In function 'void build(std::string)': main.cpp:15:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | while(i<x.length()){ | ~^~~~~~~~~~~ main.cpp: In function 'void solve(std::string, std::string, int&)': main.cpp:36:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | while(i<y.length()){ | ~^~~~~~~~~~~ main.cpp:40:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | if(j==x.length()){ | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:62:9: warning: unused variable 'n' [-Wunused-variable] 62 | int n; | ^ main.cpp:71:9: warning: unused variable 'i' [-Wunused-variable] 71 | int i = 0; | ^