Compilare: user.cpp: In function ‘void solve()’: user.cpp:69:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (auxmax==amax && s.size()!=n){ ^ user.cpp:74:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (auxmax==bmax && s.size()!=n){ ^ user.cpp:79:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s.size()<n) ^ user.cpp:53:10: warning: variable ‘chmax’ set but not used [-Wunused-but-set-variable] char chmax, chmin; ^ user.cpp:53:17: warning: variable ‘chmin’ set but not used [-Wunused-but-set-variable] char chmax, chmin; ^