Compilare: main.cpp: In function 'int main()': main.cpp:41:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < H[hasval].size(); ++j) ~~^~~~~~~~~~~~~~~~~~ main.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); ++i) ~~^~~~~~~~~~~~