Compilare: main.cpp: In function 'int main()': main.cpp:16:17: warning: iteration 19 invokes undefined behavior [-Waggressive-loop-optimizations] 16 | put2[i] = put2[i-1] * 2 ; | ~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:15:20: note: within this loop 15 | for (int i=1; i<=20; i++){ | ~^~~~