Compilare: user.cpp: In function ‘void insert(int, int)’: user.cpp:15:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<H[r].size() && exista==0; ++i) ^ user.cpp: In function ‘int main()’: user.cpp:36:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<H[i].size(); ++j) ^ user.cpp:40:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<sol.size(); ++i) ^