Compilare: main.cpp: In function 'int main()': main.cpp:15:15: warning: iteration 499999 invokes undefined behavior [-Waggressive-loop-optimizations] if(p[i]==0) ~~~^ main.cpp:13:15: note: within this loop for(i=3; i<=nmax; i+=2) ^ main.cpp:11:32: warning: iteration 499999 invokes undefined behavior [-Waggressive-loop-optimizations] for(i=4; i<=nmax; i+=2)p[i]=1; ~~~~^~ main.cpp:11:15: note: within this loop for(i=4; i<=nmax; i+=2)p[i]=1; ^