Compilare: main.cpp: In function 'void precalc()': main.cpp:16:17: warning: iteration 28 invokes undefined behavior [-Waggressive-loop-optimizations] 16 | logg2[i]=logg2[i/2]+1; | ~~~~~~~~^~~~~~~~~~~~~ main.cpp:15:13: note: within this loop 15 | for(i=2;i<=250005;i++) | ~^~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:18: warning: 'x' may be used uninitialized [-Wmaybe-uninitialized] 49 | fout<<x<<'\n'; | ^~~~ main.cpp:40:13: note: 'x' was declared here 40 | int x; | ^