Compilare: user.cpp: In function ‘int main()’: user.cpp:27:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<a.size()-1;i++) ^ user.cpp:30:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i+p[i]+1<a.size()&&i-p[i]-1>=0&&a[i+p[i]+1]==a[i-p[i]-1]) p[i]++; ^ user.cpp:37:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<a.size();i++) sol+=(p[i]+1)/2; ^