Compilare: user.cpp: In function ‘int main()’: user.cpp:12:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i) ^ user.cpp:15:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i) ^ user.cpp:20:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ap[j]==(s.size()-i)/2+1) ^ user.cpp:35:17: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] --ap[sol]; ^