Compilare: user.cpp: In function ‘void solve()’: user.cpp:16:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<W.size();i++) ~^~~~~~~~~ user.cpp:26:16: warning: variable ‘resp’ set but not used [-Wunused-but-set-variable] int resl=0,resp=0; ^~~~ user.cpp: In function ‘int main()’: user.cpp:41:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.length()) ~^~~~~~~~~~~