Compilare: user.cpp: In function ‘void precompute()’: user.cpp:16:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < a.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:38:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < b.size(); i++) ^ user.cpp:46:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cand == a.size()) ^