Compilare: user.cpp: In function ‘void expand()’: user.cpp:10:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] void expand(){while(a[r+1] == a[r-l+1] && r + 1 < a.size())++r;} ^ user.cpp: In function ‘int main()’: user.cpp:18:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<a.size();++i) ^ user.cpp:38:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=la;i<=a.size();++i) ^ user.cpp:48:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<rasp.size();++i) ^