Compilare: main.cpp: In function 'int main()': main.cpp:23:77: warning: comparison of integer expressions of different signedness: 'std::vector<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 23 | while(sol.empty() == false && sol.back() < ch && sol.size() + n - i > m) | ~~~~~~~~~~~~~~~~~~~^~~ main.cpp:13:10: warning: unused variable 'ok' [-Wunused-variable] 13 | bool ok = false; | ^~