Compilare: main.cpp: In function 'int main()': main.cpp:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<aux.size(); i++) ~^~~~~~~~~~~ main.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<s.length(); i++) ~^~~~~~~~~~~ main.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(k<s.length() && s[k]==s[2*i-k]) ~^~~~~~~~~~~