Compilare: main.cpp: In function 'int main()': main.cpp:18:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i=0;i<hashh[clasa].size();i++) | ~^~~~~~~~~~~~~~~~~~~~ main.cpp:38:36: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized] 38 | swap(hashh[clasa][i], hashh[clasa].back()); | ^