Compilare: main.cpp: In function 'int main()': main.cpp:11:9: warning: iteration 1000000 invokes undefined behavior [-Waggressive-loop-optimizations] 11 | v[i]=i; | ~~~~^~ main.cpp:10:18: note: within this loop 10 | for(int i=1;i<=1000001;++i) { | ~^~~~~~~~~ main.cpp:16:15: warning: iteration 999999 invokes undefined behavior [-Waggressive-loop-optimizations] 16 | if(v[i]==i) | ~~~^ main.cpp:14:18: note: within this loop 14 | for(int i=2;i<=1000001;++i) | ~^~~~~~~~~