Compilare: main.cpp:21:5: warning: built-in function 'log2' declared as non-function [-Wbuiltin-declaration-mismatch] 21 | int log2[300005]; | ^~~~ main.cpp: In function 'void euler(int)': main.cpp:27:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | for(int i=0;i<fii[nod].size();i++) | ~^~~~~~~~~~~~~~~~