Compilare: main.cpp: In function 'int32_t main()': main.cpp:34:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll i=0;i<s.size();i++) ~^~~~~~~~~ main.cpp:38:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ll i=0;i<s.size();i++) ~^~~~~~~~~