Compilare: main.cpp: In function 'int main()': main.cpp:18:18: warning: iteration 99999 invokes undefined behavior [-Waggressive-loop-optimizations] if(prim[i]) ~~~~~~^ main.cpp:17:15: note: within this loop for(i=2; i<=100001; ++i) ~^~~~~~~~ main.cpp:16:16: warning: iteration 99999 invokes undefined behavior [-Waggressive-loop-optimizations] prim[i]=1; ~~~~~~~^~ main.cpp:15:15: note: within this loop for(i=2; i<=100001; ++i) ~^~~~~~~~ main.cpp:21:25: warning: 'n' may be used uninitialized in this function [-Wmaybe-uninitialized] for(j=i+i; j<=n; j+=i) ~^~~ main.cpp:12:18: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized] int n, k, i, j; ^