Compilare: main.cpp: In function 'void solve(ll&, ll&)': main.cpp:14:13: 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<s.size() && s[i]!='='){ | ~^~~~~~~~~