Compilare: main.cpp: In function 'int main()': main.cpp:32:15: warning: iteration 999999 invokes undefined behavior [-Waggressive-loop-optimizations] 32 | if(f[i] >= 2) suma += 1LL*i * i * (f[i] * ( f[i] - 1) / 2); | ~~~^ main.cpp:31:19: note: within this loop 31 | for(i = 1 ; i <= 1000000 ; i++) | ~~^~~~~~~~~~