Compilare: user.cpp: In function ‘int este(int, int)’: user.cpp:28:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < h[val].size() ; i++) ^ user.cpp:29:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < h2[val2].size() ; j++) ^